LIST OF DIPTERA. 617 



valida, lanceolata. Antennarum avticulus 3us lanceolatus, lo paullo 

 longior ; arista 3o vix longior. Thorax utrinque parce setosus. 

 Abdomen oblaneeolatum, fere nudum. Pedes validi, pilosi. Mas. — 

 Abdomen alas longe superans. Sexualia mediocria. Pedes pilosi. 

 Fcem. — Abdomen alas longe superans, apicem versus subcompressum 

 et subatteuuatum. Pedes parce pilosi. 



Fern. Radial vein nearly straight, joining the subcostal at 

 rather far from the tip of the latter. Cubital vein forked at before 

 half its length; the forks very slightly curved, converging towards 

 their base, and more slightly so towards their tips; fore fork forming 

 at its base a right angle, which emits a branch; the latter is full 

 twice the length of the basal side of the angle. First and second 

 externo-medial veins nearly straight ; third curved, forming a nearly 

 right angle with the praebrachial, which is curved, joining the fourth 

 at very far from the border. Subanal joining the anal at some little 

 distance from the border. 



A. apicalis, Wied. 



1. Erax lateralis. 



Ater ; abdominis latera albido maculata, segmenta ultima albida 

 medio testacea aut nigra ; alee fuscance. 



Erax lateralis, Macq. Dipt. Exot. i. 2, 116, 21. 



Philadelphia. 



2. Erax niger. 



Foem. Niger ; mystax albidus ; thorax canus, nigro vittatus ; 

 tibia badiee. ; alcejiavescentes. 



Asilus uiger, Wied. 



Georgia. 



3. Erax pogonias. 



Fuscanus ; mystax albidus ; thorax obsoletissime nigro vittatus ; 

 pedes nigri, tibiis badiis apice nigris ; alcejiavescentes. 



Dasypogon barbatus, Fabr. Syst. Antl. 169, 22. 

 Asilus pogonias, Wied. Dipt. Exot i. 198, 29; Auss. Zxveifi. i. 4(j0, 

 54. 



North America. 



4. Erax completus. 



Mas. Ater ; barba alba ; abdominis segmenta duo apicalia nivea ; 

 tibia? castanea ; alarum vena Jlavo limbata, vena submarginali 

 externa Integra. 



3h2 



