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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.
Five new species of Hydrellia Robineau-Desvoidy are described from localities in Alabama, Florida, Louisiana, and Texas. H. alabamae, n. sp. was first collected on water primrose in northern Alabama and later in northern Florida on Nuphar and Nymphoides. At present, there is no indication about potential host plant species. H. naiadis, n. sp. was reared from Najas guadalupensis (Spreng) Morong in northern Florida and later collected throughout the state and also in southeastern Texas. H. apalachee, n. sp., first collected in northern Florida and later in northern Alabama, is unique among described Hydrellia in having a bivittate mesonotum. Thus far, no host-plant species is known for this species. H. lirnnobii, n. sp. was first reared from Limnobium spongia (Bosc) Richard (frogbit) in 1986 at the Florida Biological Control Laboratory and has since been collected throughout the state as well as in southern Louisiana and southeastern Texas. The last species, H. pontederiae, n. sp., with males 4.00 mm and females 4.80 mm long, is the largest species in the genus as known by me; it has been reared from Pontederia cordata Linnaeus, but only one specimen (a female) has been collected in the field.