60 



U.S. NATIONAL MUSEUM BULLETIN 2 83 



spines as: fore leg 0-0-1, 0-0-1, 0-0-2; mid leg 1-0-2, 0-0-2, 0-0-2; 

 hind leg 0-0-0, 0-0-2, 0-0-2. Hind leg with lengths from femur toV 

 as 83-81-43-20-7-5-12; TR 2.15; hind tibial comb with 7 spines. 



Wing (fig. 61c): Faintly brownish, anterior veins strong; CR 0.84; 

 r-m to stem M lengths as 14:13; proximal section of radius with 5 

 scattered setae; macrotrichia along wing margin between 2RC and 

 vein M 2 , a number along distal third of vein M! and in a row on each 

 side, a few extending into cell M 2 and along vein M 3+4 ; alula fringed. 

 Halter faintly brownish. 



Figure 61. — Stilobezzia parvitheca, new species (a-f, 9 ; g~i, d 1 )- a, frontovertex; b, last 2 

 tarsomeres and claws; c, wing; d, spermathecae; e, palpus;/, abdominal terga I-IV, 9 ; 

 g, same; h—j, c? genitalia. 



Abdomen (fig. 61/): Pale brownish, segments VII I-IX dark brown; 

 tergum I with cluster of 7-8 hairs on each side; II and behind each 

 with sparse row of hairs on hind margin. Spermathecae (fig. 61(f) 2, 

 rudimentary third absent; strongly sclerotized dark brown, oval 

 without sclerotized necks, unequal, measuring 0.049 mm by 0.035 

 mm and 0.032 mm by 0.028 mm. Genital sclerotization not in suitable 

 position for observation. 



Male. — Length of wing 1.57 (1.49-1.67, n = 8) mm. 



Similar to the female with the usual sexual differences; antennal 

 plumes dark brown; hairs on femora and tibiae stronger and bristle- 

 like, strongly seriate; claws equal, sharp with simple tips; abdomen 

 with hairs more numerous (fig. 61#), tergum I with 16-17 hairs on each 

 side. Genitalia (fig. 61/i-j) with sternum IX broad, no caudomedian 



