Refine
Year of publication
- 1993 (88) (remove)
Document Type
- Article (88) (remove)
Language
- English (88) (remove)
Has Fulltext
- yes (88) (remove)
Keywords
- 5-Hydroxyaloin A (1)
- Absurde Literatur (1)
- Acacia nilotica (1)
- Aloe (1)
- Anisostena (1)
- Apostena (1)
- Asphodelaceae (1)
- Biological control organisms (1)
- Brief an den Vater <Werk> (1)
- Carotenoids (1)
Institute
- Physik (12)
- SFB 268 (9)
- Biochemie und Chemie (2)
- Biowissenschaften (2)
- Informatik (1)
The 13 South American members of the Oxybelus emarginatus group are keyed, new species described, and illustrations given. New species are: cinemucro (Argentina), genisei (Brazil), mendozae (Argentina), schlingeri (Venezuela), schusteri (Galapagos), slanskyae (Peru), stangei (Argentina), vardyi (Peru), and wasbaueri (Ecuador).
It is well known that artificial neural nets can be used as approximators of any continuous functions to any desired degree and therefore be used e.g. in high - speed, real-time process control. Nevertheless, for a given application and a given network architecture the non-trivial task remains to determine the necessary number of neurons and the necessary accuracy (number of bits) per weight for a satisfactory operation which are critical issues in VLSI and computer implementations of nontrivial tasks. In this paper the accuracy of the weights and the number of neurons are seen as general system parameters which determine the maximal approximation error by the absolute amount and the relative distribution of information contained in the network. We define as the error-bounded network descriptional complexity the minimal number of bits for a class of approximation networks which show a certain approximation error and achieve the conditions for this goal by the new principle of optimal information distribution. For two examples, a simple linear approximation of a non-linear, quadratic function and a non-linear approximation of the inverse kinematic transformation used in robot manipulator control, the principle of optimal information distribution gives the the optimal number of neurons and the resolutions of the variables, i.e. the minimal amount of storage for the neural net. Keywords: Kolmogorov complexity, e-Entropy, rate-distortion theory, approximation networks, information distribution, weight resolutions, Kohonen mapping, robot control.
Jurassic accretionary complex of the Tamba terrane, southwest Japan, and its formative process
(1993)
Twenty-eight new species of plant-feeding Cecidmnyiidae are described from galls taken on five species of Acacia in Kenya. The new species are placed in seven genera, four of them new. The new taxa, to be attributed to Gagne, are as follows, in bold face: in Acacidiplosis: ananas, cespitosa, conica, crispa, echinata, erupta, hamata, imbIicata, lamosa, lugosa, spinosa, undulata, and verticillata; in Aposchizomyia: acuta, brevis, crenata, longa, striata, and turnouri; Asphondylia napiformis; in Athidiplosis: bullata and walteri; in Contarinia. earolinae, hongoi, and plicata, Kimadiplosis divel sa, in Lupesia. niloticae and armata. The larvae, pupae, and the host-specific galls of these species generally offer the best characters for species discrimination. Galls of several additional species of gall midges from Acacia spp. in Kenya are described, but the gall makers are left unnamed for lack of suitable specimens. Collula acaciae (Kieffer 1912) is shown to be a junior homonym of Collula acaciae (Kieffer 1909) andis renamed kiefferi. Gail midges from acacias in Africa, India, and Australia are reviewed. Cecidomyia acaciaelongifoliae Skuse (1890) from Australia is newly combined in Dasineura. Two ofthe Bew species, Acacidiplodisspinosa and Aposehizomyia acula, inhibit flowering of Acacia nilotica and are potential biological control agents of their host in Australia.
The tribe Rhopalophorini is reviewed for North and Central America. Keys to genera and species are provided, and known species are redescribed. The genus Rhopalophora Audinet-Serville is revised to include 16 species, with the following additions: R.serripennis n. sp. and R. yucatana n. sp. are described from Mexico; R. rugicollis houorei n. ssp. is described from Baja California; and R. meeskei Casey, 1891 is restored to species status. New synonymies are: R. incrustata Chevrolat, 1859 = R. tenuis (Chevrolat, 1855); R. laeuicollis LeConte, 1873 = R. cupricollis Guérin-Méneville, 1844. Distribution maps are included for the more common species. The subgenus Ischionodonta Chevrolat is raised to generic status, and includes 3 species: I. serripes (Bates, 1872) n. comb.; I. uersicolor (Chevrolat, 1859) n. comb.; andl. mexicana n. sp. from Mexico. CosmisomaAudinet-Serville is revised to include 6 species, with 2 newly described: C. militaris n. sp. from Panama and Costa Rica, and C. rhaptos n. sp. from Panama and ColombiabNew synonymies are: C. nudicornis Bates, 1892 = C. martyr Thomson, 1860, and C. alboscutellata linsley, 1935 = C. reticulata Bates, 1885. Cycnoderus Audinet-Serville is newly recorded from Mexico and Central America with 6 species: C. virginiae n. sp., C. copei n. sp., C. liuidus n. sp., C. breuicolle n. sp. from Mexico, and C. guatemalicus n. sp. from Guatemala. Cycnoderus barbatus Gounelle is recorded from Costa Rica and Panama. A new genus, Muxbalia, is proposed and tentatively placed in the Rhopalophorini, and M. monzoni n. sp. is described from Guatemala. Ozodes Audinet-Serville, and Lissozodes Bates are removed from the Rhopalophorini and placed provisionally in the Necydalopsini. Rhopalophora cupricollis, R. longipes, R. serripennis, Cycnoderus uirginiae, Cosmisoma rhaptos, and Muxbalia monzoni are illustrated.
Twenty-four of the larger species of Oxybelus occurring in South America (except Chile) are recognized. Akey is given and illustrations are provided of the critical thoracic projections: metanotal squamae and propodeal mucro. New species described and their type localities are: aganis (Paraguay), cyaneus (Colombia), decoris (Brazil), fraternus (Argentina), frontis, (Argentina), huae Wcuador), napoensis (Ecuador), osteni, (Argentina), peruensis (Peru), peruvicus (Peru), plaumanni (Brazil), roraimae (Brazil), scutellatus (Argentina), tartagalae (Argentina) and willinki (Argentina).
Critical taxonomic analysis of the Hydrellia pakistanae species group yielded H. pakistanae Deonier, H. sarahae, n.sp. (composed of H. sarahae sarahae, n.ssp. in China and H. sarahae laticapsula, n.ssp. in India and Pakistan), H. balciunasi Bock known only from Australia, and a related species, H. bogorae, n.sp. from Java, Indonesia. These species all have the same primary host-plant species, i.e., Hydrilla verticillata, a fact making them all potential biocontrol agents for this aquatic plant pest in North America and other areas where it has pest status. Morphology is summarized as well as perceived synapomorphies of this species group.
Three new species of Cerobasis (Trogiidae) and three new species of Psyllipsocus (Psyllipsocidae) from Mexico are here described, which rises to seven the number of Mexican Cerobasis, and rises to nine the number of Mexican Psyllipsocus. Identification keys for the Mexican species of both genera are provided. The Mexican species of Trogiomorpha are thus known to consist of 46 species, of which 25 (54%) are endemic to this country. Lists of Cerobasis and Psyllipsocus species are presented, as well as a list of the known Mexican Trogiomorpha, including the distribution in this country of each species.
The 37 recognized Oxybelus of Central America and the Caribbean are listed, a key given, and the critical thoracic projections figured for many of the species. New species are coloratus (Mexico), irwini (El Salvador), jamaicae (Jamaica), melanitus (Mexico), morrisoni (Puerto Rico), propodealis (Honduras), rhodopyga (Mexico), and romingeri (Hispaniola). New synonyms of mexicanus Robertson 1889 are frontalis Robertson 1889, bugabensis Cameron 1891, and longispina Cameron 1891.