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A Review of the Genus Pseudiastata Coquillett (Drosophilidae, Diptera)

Proceedings of the Hawaiian Entomological Society
Smithsonian Institution Biodiversity Heritage Library
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76 Proceedings, Hawaiian Entomological Society A Review of the Genus Pseudiastata Coquillett (Drosophilidae, Diptera) D. Elmo Hardy1 UNIVERSITY OF HAWAII HAWAII AGRICULTURAL EXPERIMENT STATION, HONOLULU, HAWAII (Presented at the meeting of July 14, 1958) The members of the genus Pseudiastata are allied to the genus Gitonides Knab because of the pubescent arista; the large bare eyes; the presence of three pairs of strong orbital bristles; the presence of pre scutellar acrostichals; by having the two pairs of dorsocentral bristles rather close together on the hind portion of the mesonotum; by the con cave occiput; by the densely setose mesonotum; and by the short, broad scutellum. Also, like Gitonides, all of the known species of Pseudiastata are mealybug predators, and are of considerable importance as biological control agents. Pseudiastata differ from Gitonides by lacking brown spots over the mesonotum and front; by lacking a distinct crossvein between cells 1st M2 and M; by the maculated wings (figs. 1A and 2A) ; by having the third section of the costa five to six times longer than the fourth sec tion; and by the very different male genitalia. The male genitalia of Pseu diastata lack claspers and the ninth tergum is usually distinctly lobate at ventral apices (figs. IE and 2B). In Gitonides well developed, heavily spined claspers are present, and the ninth tergum is broad and not lobate. In Pseudiastata the postocellar and prescutellar bristles are also much more strongly developed than in Gitonides. The wings are marked with transverse brown to black marks in Pseudiastata (figs. 1A and 2A), where as the wings of Gitonides are hyaline. Pseudiastata specimens were purposely introduced into the Hawaiian Islands between 1924 and 1937 in an attempt to establish natural enemies of pineapple mealybugs (Dysmicoccus brevipes (Cockerell) ). Refer to Fullaway (1933, Hawaii. For. Agric. 30:57), Carter (1935, Jour. Econ. Ent. 28:1039-40). Specimens were introduced by the Pineapple Research Ins

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