692 LIST OF DIPTERA. 



b. Alae totse limpidae. , - Orphne, Walk. 

 B. Aiitennee basi pallidas. 



a. Femora auteriora nigra. - ultiraus, Walk. 



b. Femora auteriora nigro vittata. - Herminius, Walk. 



c. Pedes mellei. ----- gracilis, Wied. 

 H. Mystax albus ant albidus. - - - femoralis, Macq. 



Group 1. 



Corpus minor, cinerenm, pavce setosam, vix hirtum. Facies 

 apnd epistoina convexa. Mystax dense setosus. Proboscis gracilis, 

 linearis. Antennarum articulus 3us lanceolatus, lo paullo longior ; 

 arista 3o brevior. Abdomen gracile, tborace duplo longius. Pedes 

 sat valirli, spinosi, parce birti. Mas. — Sexualia parva. F&m. — 

 Abdomen compressum, apicem versus attenuatum et lanceolatum. 



Radial vein curved at its tip. Cubital forked at much beyond 

 half its length ; fore fork nearly straight ; hind fork slightly undu- 

 lating. First and second externo-medial veins almost straight ; 

 third very slightly curved, forming an obtuse angle with the prae- 

 brachial, joining the fourth rather far from the border. Subanal 

 joining the anal very near the border. 



Asilus Sadyates, Walk. ; A. Alethes, Walk. ; A. Lecythus, Walk. 



Group 2. 



Fcem. Corpus ferrugineum, fere nudum. Facies plana. 

 Mystax sat dense setosus. Proboscis valida, lanceolata. Thoracis 

 latera parce setosa. Abdomen longum, sublineare, apicem versus 

 oblanceolatum, tborace triplo longius, alas longe superans. Pedes 

 longiusculi, sat graciles, parce spinosi, non pilosi. 



Cubital vein forked at a little before two-thirds of its length ; 

 forks nearly straight. First externo-medial curved at its base ; 

 second straight; third hardly curved, forming a very slightly obtuse 

 angle with the pnebrachial, joining the fourth wing far from the 

 border. Subanal joining the anal on the border. 



Asilus Herminius, Walk. 



104. ASILTTS TIBIALIS. 



Fo3m.— Cinereus ; mystax niger, cinereo mixtus ; antenna nigra ; 

 thorax vittis nigris ; abdomen cinereo -nigrum ; pedes nigri, 

 tibiis testaceis apice nigris ; aim fuscescenles. 



Asilus tibialis, Macq. Hist. Nat. Dipt. i. 313,38. 



Philadelphia. 



