JiBT. 9 FLIES OF THE FAMILY SYEPHIDAE SHANNON" 11 



than the preceding segments and broader, giving the abdomen a 

 subspatulate form. The fifth sternite is subquadrate; the sixth seg- 

 ment is a continuous cylinder of chitin without sutures. It differs 

 further in having the alula greatly reduced. Therefore, the species 

 is not placed in the same subgenus, Pelecinohaccha. 



Head dark aeneous; frontal lunule large and rugose; antennae 

 rather small, brown; facial tubercle well developed; face moderately 

 narrowed, nearly parallel-sided; mesonotum bluish aeneous with 

 three longitudinal vittae; fore and mid femora and tibiae yellow, the 

 tarsi blackened; hind femur with a dark preapical ring; hind tibia 

 yellow basally, black beyond, the tarsus black; abdomen dark; an 

 interrupted yellow band beyond middle of second tergite; third and 

 fourth tergites yellowish basally ; wings hyaline, except narrowly on 

 anterior border as far as tip of first vein; distal section of apical 

 cross vein shorter than posterior cross vein ; squamae greatly reduced. 

 Length, 11.5 mm. ; wing, 5 mm. 



One specimen. 



Type locality. — Tumupasa, Bolivia (December, 1921, W. M. Mann, 

 Mulford Biological Expedition, 1921-22). 



Type.—C2ii. No. 28760, U.S.N.M. 



BACCHA (BACCHA) PUNCTATA, new species 



Male. — This is a well-marked species, closely allied to hirta (the 

 following species) but lacks the long vestiture. Blackish species, 

 frontal triangle very large, higher than broad, the upper half opaque 

 black with a pair of silvery pollinose spots, lower portion bluish 

 aeneous; lower margin of eye narrowly separated from oral margin; 

 legs entirely black; mesonotum opaque black with several aeneous 

 longitudinal vittae; first tergite aeneous, the second aeneous with a 

 large triangular and opaque preapical mark which contains a pair 

 of yellow dots; disk of third, fourth, and fifth tergites opaque 

 black and each with four yellow dots; wings infuscated basally, 

 hyaline apically; squamae, squamal cilia and plumula dark brown. 



Length 12 mm. ; wing 9.5 mm. 



One specimen. 



Type locality. — San Antonio, Beni, Bolivia (November, 1921, 

 W. M. Mann, Mulford Biological Expedition). 



Type.—Q^X. No. 28758, U.S.N.M. 



BACCHA (BACCHA) HIRTA. new species 



Male. — An easily recognized species because of its unusually long, 

 stiff, erect, and black vestiture, a unique character in this genus. 

 Head black; frontal lunule large, with a pair of reddish brown 

 spots, one above each antenna; frontal triangle large, face fairly 

 broad, but little converging downward; eyes narrowly separated 



