64 THOMAS SAY EOUNDATIOX 



are longer than the other marginals. They are the 

 same in both sexes. Fifth sternite undivided. 



In the female the frontal bristles form exactly 

 parallel rows not diverging anteriorly and the frontal 

 stripe is wide, with parallel sides. 



Type. — Thelodiscus indivisus n. sp. 



No. 20. Thelodiscus indivisus n. sp. 



Male. Front .146 of liead (a^'erage of three, — 

 .142, .144, cl5"2) ; frontal stripe at tlie narrowest about 

 half as wide as at anterior end; paraf rentals and para- 

 lacials light golden yellow, the latter moderately wide, 

 with small hairs not distinctly arranged in rows, and 

 facial impression more or less red; the same color ex- 

 tending across the oral margin and partially on the 

 facialia. Antennae almost pure reddish yellow, the 

 third joint hardly twice the second, reaching about 

 three-fourths of the way to the vibrisSct ; arista brown, 

 plumose for three-fourths of its length ; tlie plumosity 

 a little shorter than in Sarcophaga. Palpi yellow, 

 slender. Proboscis black, ordinary; bucca one-fourth 

 the eyeheight; back of head with only black liairs, 

 there being no pale beard at all. 



Thorax gray pollinose, with 8 to .5 black stripes 

 on the mesonotum, and the following chaHotaxy: ps 

 dc 3; ant acr absent; prsc 1 pair, of medium size; stpl 

 usually 4; notopleural 2. 



Abdomen gray pollinose, with the usual tessel- 

 lation; the median black stripe is constant; tip of 

 fourth segment red; first and second segment have 

 only lateral bristles; third segment with an inter- 

 rupted row; fourth segment with a row of about 12. 



Hypopj^gium red, rather large, sloping down- 

 ward so as to give the abdomen a truncate appear- 

 ance. First segment pollinose at the basal edge, with 

 a row of 4 stout bristles; second segment subshining; 

 forceps uniformly tapering and curved forward, slen- 

 der toward the apex, rather widely divergent, with 

 long outstanding black hair on the back and sides. 

 Accessory plate slender, finger-like, with short erect 



