750 LIST OF DIPTERA. 



Group 16. 



Corpus mediocre, latiusculum, hirtum. Caput subtus dense 

 pilosum. Fades parum convexa. Mystax raro setosus. Proboscis 

 lanceolata. Antennarum articulus lus 2o duplo lonsrior ; 3us lan- 

 ceolatus, lo paullo longior ; arista lo paullo longior Thoracis latera 

 et scutellum setosa. Pedes robusti, subpubescentes, raro spinosi ; 

 metatarsi latiusculi. 



Radial as usual. Cubital vein forked at very much beyond 

 half its length ; fore fork nearly straight ; hind fork undulating. 

 First and second externo-medial veins nearly straight; first curved 

 at the base ; third curved, forming an obtuse angle with the praebra- 

 chial, joining the fourth far from the border. Subanal joining the 

 anal rather near the border. 



Asilus Sophus, Walk. ; A. Balacrus, Walk. 



Group 17. 



Corpus gracile, mediocre, fere nudum. Caput subtus pilosum. 

 Facies plana. Mystax parvus, setis paucisapud epistoma. Mystax 

 gracilis, sublinearis. Antennarum articulus lus 2o duplo longior; 

 3us longiconicus, lo multo brevior; arista 3o duplo longior. Tho- 

 rax breviter et parce hirtus; latera et scutellum parce setosa. Ab- 

 domen thorace plus duplo longius, alas superans ; incisure? lateribus 

 parce setosis. Pedes nudi, sat validi, parce spinosi. Mas. — Ab- 

 domen lineare. Sexualia minima. Fcem. — Abdomen apicem ver- 

 sus oblanceolatum, apice compresso lasvi nitido. 



Cubital vein forked at much beyond half its length ; forks very 

 slightly undulating, their tips diverging. First, second and third 

 externo-medial veins nearly straight ; third forming an obtuse 

 angle with the praebrachial, joining the fourth far from the border. 

 Subanal joining the anal very near the border. 



Asilus Thimbro, Walk. 



Group 18. 



Corpus mediocre, fere nudum. Caput latum, subtus parce 

 pilosum. Facies fere plana. Mystax parvus, setis paucis. Pro- 

 boscis sublinearis. Antennarum articulus lus 2o triplo longior ; 

 3us lanceolatus, lo paullo brevior; arista brevissima. Thoracis 

 latera vix setosa. Pedes validi, spinosi, non hirti. 



Cubital vein forked at much beyond half its length ; forks 

 nearly straight. Externo-medial veins nearly straight; third form- 



