£I3T OF DIPTERA. 631 



Group 12. 



Mas. Corpus sat dense hirtura. Caput subtus densissime 

 pilosum. Facies valde convexa. Mystax dense setosus. Anten- 

 narum articulus lus 2o plus duplo longior; 3us longiconicus, lo 

 brevior; arista 3o triplo longior. Thoracis latera etscutellum parce 

 setosa. Abdomen alas superans. Sexualia magua. Pedes ro- 

 busti, spinosi, breviter hirti. 



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

 slightly curved, converging towards the base, and more slightly 

 towards the tips ; fore fork forming at its base a very slightly obtuse 

 angle, which emits a branch ; the latter is longer than the basal side 

 of the angle. First, second and third externo-medial veins hardly 

 curved ; third forming an almost right angle with the praebrachial, 

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

 near the border. 



Erax senilis, Wied. 



Group 13. 



Fcem. Corpus robustum. Caput subtus valde pilosum. Facies 

 convexa. Mystax dense setosus. Proboscis linearis, sat gracilis. 

 Antennarum articulus 3us longiconicus, lo agqualis, arista brevior. 

 Thorax parce setosus. Abdomen nudum, oblanceolatum, apice 

 compressum, non stylatum, alas vix superans. Pedes validi, spinosi, 

 non hirti. 



Cubital vein forked at much before half its length ; forks near 

 each other and parallel towards the base, slightly converging and 

 curved forwards at the lips ; fore fork forming at its base a right angle, 

 which emits a branch ; the latter is much longer than the basal side 

 of the angle. First and second externo-medial veins almost 

 straight ; third slightly curved, forming a right angle with the pra- 

 brachial, joining the fourth near the border. Subanal joining the 

 anal near the border. 



Erax Sicyon, Walk. 



28. Erax fulvithorax. 



Ater ; thorace cervinus, nigro vittatus ; abdominis segmenta duo 

 apicalia nivea (mas.) aut incisuris albidis (foem.) ; alec fus- 

 cance, paullo dilatatce,. 



Erax fulvithorax, Macq. Dipt. Exot. i. 2, 1 13, 13. 



Allied to A. pyrvhogonus, Wied. 

 Brazil. Guiana. 



3 i 3 



