744 LIST OF DIPTERA. 



C. Mystax niger, albo varius. 



A. Pedes nigri. - Penarius, Walk. 



B. Femora ni^ra. 



A. Alae suhfuscae. 



a. Antennas basi ferrugineae. - Corythus, Walk. 



b. Antenna? totas nigra. ... Ochesitis, Walk. 



B. Ala subcinereae. ----- Coras, Walk. 



C. Femora rufa, nigro vittata. - Balacrus, Walk. 



D. Mystax flavus, aut flavo-albus. 



A. Alae maculates. ----- Hercules, Wied. 



B. Alas non maculates. 



a. Pedes nigro-aenei. - inumbratus, Walk. 



b. Femora rufa, nigro vittata. - rufipes, Macq. 



c. Femora rufa, non vittata. 



a. Thorax cinereo canescens. - Virgo, Wied. 



b. Thorax fulvus, vittis quatuor obscurioribus. 



Thimbro, Walk. 



E. Mystax albus. 



A. Alas flavescentes, apice subfuscas. - - ochripes, Macq. 



B. Alas limpidae. ------ Dasius, Walk. 



Group 1. 



Mas. Corpus magnum. Caput subtus densissime setosum. 

 Facies convexa. Mystax dense setosus, sat magnus. Proboscis 

 lanceolate. Antennarum articulus lus 2o plus duplo longior; 3us 

 lanceolatus, lo brevior; arista 3o longior. Thoracis latera parce 

 setosa. Abdomen sublineare, thorace duplo longius, alas vix supe- 

 rans, basim versus pilosum. Sexualia parva ; forceps rectus sub- 

 linearis. Pedes validi, spinosi, parce hirti. 



Allied to Erax. Cubital vein forked at about half its length ; 

 forks hardly undulating; fore fork almost angular near its base. 

 First and second externo-medial veins indistinctly undulating ; 

 third curved, forming a very obtuse angle with the prasbrachial, 

 joining the fourth far from the border. Subanal joining the anal at 

 some little distance from the border. 



Asilus Corissus, Walk. 



Group 2. 



Mas. Corpus angustum, subpubescens. Caput subtus dense 

 pilosum. Facies parum convexa. Mystax vix dense setosus. 

 Proboscis lanceolate. Thoracis latera et scutellum subsetosa. Ab- 

 domen thorace duplo longius. Sexualia parva. Pedes validi, pilosi, 

 spinosi. 



