104 MR. WALKER ON DIPTERA COLLECTED AT MAKESSAB. 



veins black, ferruginous at the base ; halteres testaceous. Length of 

 the body 6 lines ; of the wings 12 lines. 



37. Tabanus FLEX! MS, u. s. Fffiwi. Ciuercus, testaceo tomentosus, 

 callo nigro longo gracillimo, palpis testaceis, antennis ochraceis sub- 

 dentatis apice nigris, abdomine ferrugineo fusco maculis dorsalibus 

 trigonis marginibusque posticis testaceis, tibiis basi fulvis, alis cinereis 

 apud costam subluridis fusco bifasciatis, halteribus testaceis apice albis. 



Female. Cinereous, with testaceous tomentum ; head with a black, long, 

 extremely slender callus j palpi testaceous ; antennae ochraceous, with 

 black tips and with a very small black tooth ; pectus whitish ; abdo- 

 men ferruginous brown ; each segment with a large triangular spot 

 and with the hind border testaceous ; tibise tawny towards the base ; 

 wings cinereous, somewhat lurid along the costa, with two irregular 

 brown bands; 1st band short, discal, 2nd abbreviated hindward ; 

 veins black, feiTuginous at the base ; fore branch of the cubital vein 

 simple, nearly straight ; halteres testaceous with white tips. Length 

 of the body 8 lines ; of the wings 16 lines. 



Gen. Chrtsops, Meigen. 



38. Chrysops fasciatus, Wied. See Vol. L p. 112. 



Fam. ASILIDiE, Leach. 



Subfam. Mtdasites, Walk. 



Q-en. Mydas, Fahr. 



39. Mydas basifascia, n. s. Fcem. Atra, antennis clavatis, ab- 

 domine fascia basali flava apice nitente, femoribus tibiisque posticis 

 rufescentibus, alis cinereis apud venas ochraceis. 



Female. Deep black ; antennae clavate, a little linger than the breadth 

 of the head ; abdomen with a slender yellow band very near the base, 

 shining at the tip ; hind femora and hind tibiae reddish ; wings cine- 

 reous, ochraceous about the veins, which are also ochraceous. Length 

 of the body 12 lines ; of the wings 22 lines. 



Subfam. Dasypogonites, Walk. 

 Gren. DiscocEPHALA, Macquart. 



40. DiscocEPHALA PANDENS, u. s. Mas. Picea, proboscide palpis- 

 que nigris, pectore thoracisque lateribus albidis, abdomine subtus pal- 

 lide cinereo maculis lateralibus nigris, pedibus fulvis, genibus nigris, 

 tarsis piceis, alis fuscescentibus cinereo strigatis et marginatis, halte- 

 ribus albidis. Fcem. Abdomine fulvo, alis cinereis. 



Male. Piceous ; front facets of the eyes large; proboscis and palpi black ; 

 raystax with four bristles; pectus and sides of the thorax whitish; 

 abdomen beneath pale-cinereous, with black shining spots along each 

 side ; legs tawny ; trochanters and knees black ; tarsi piceous ; wings 



