300 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.51. 



joint fuscous on apical portion; venter, thorax, pleurae and outside 

 of femora silvery, the silvery of venter showing narrowly above on 

 sides of anal segment; thoracic vittae not defined. Tibiae and tarsi 

 black; hind femora also black, middle femora only slightly greenish. 

 Wings broadly smoky on veins. Tegulae white. 

 Holotype.—No. 20026, U.S.N.M. 



HYPOPYGIOPSIS, new genus. 



Genotype. — Hypopygiopsis splendens, new species. 



Allied to Cynomya and Blepharicnema, differing as follows: Male. 

 Arista plumose nearly to tip. Cheeks broad and yellow. Front of 

 male narrow, with one reclinate fronto-orbital. Ocellars present. 

 Outer verticals absent. Flexor surface of femora and tibiae densely 

 long hairy; hind femora enlarged and bowed. Body elongate. 

 Hypopygium densely hairy, elongate but retracted, apparently very 

 large, hinged from a small seventh segment, which is also pilose. 

 Wings deeply infuscated, lighter area near base. Claws not extra 

 long. Third vein bristled over halfway to small cross vein. 



HYPOPYGIOPSIS SPLENDENS, new species. 



Length of body, 14 to 17.5 mm.; of wing, 13 to 15 mm. Three 

 males, Trong, Lower Siam (Dr. W. L. Abbott). 



Face, cheeks, and parafrontals satiny yellow, light golden poUinose; 

 vertex and ocellar area metallic green to greenish-black. Palpi and 

 third antennal joint deep clear fulvous-yellow. Frontalia, first 

 two antennal joints, and arista brownish-yellow, the former shading 

 to brown posteriorly. Occiput cinereous, with gray pubescence; 

 cheek beard deep yellow. Thorax, scutellum, and abdomen varying 

 from metallic purplish or bluish-green to bright green, the thorax 

 very thinly dusted with silvery, the abdomen showing no pollen; fu-st 

 abdominal segment black. Front and middle femora more or less 

 metallic greenish, rest of legs brown to blackish. Wings subuni- 

 formly yellowish-smoky, with subbasal area of pale yellowish. Teg- 

 ulae pale watery-smoky. 



Eolotype.—'No. 20027, U.S.N.M. 



Family CALIRRHOIDAE. 



THERESIOPSIS, new genus. 



Genotype. — There siopsisjicorum, new species. 



Belongs in Sardiocera group. Differs from EutTieresia as follows: 

 Female. Face rather longer, the peristomal profile only sHghtly 

 curved upward in front. Facial carina only slightly developed. 

 Third antennal joint about three times the second. Front narrower, 

 the parafrontals posteriorly only a little over one-half width of fron- 



