MR. WALKEB ON DIPTERA COLLECTED AT MAKESSAU. 129 



Female. Cinereous ; head large, silverj, almost conical in front ; fron- 

 talia black, linear, with a few bristles along each side ; face very ob- 

 lique ; facialia without bristles ; epistoma not prominent ; eyes bare ; 

 proboscis and palpi black, very short ; antenna; extending to the epi- 

 stoma, 3rd joint linear, rounded at the tip, full six times the length of 

 the 2nd ; arista longer than the 3rd joint ; stout to nearly half its 

 length ; thorax with four black stri^)es, the outer pair interrupted ; 

 abdomen conical, not longer than the thorax, hind borders of the seg- 

 ments and dorsal stripe black ; legs black, rather short and stout ; 

 wings grey ; veins black ; praebrachial vein forming an almost right 

 angle and emitting a branch at its flexm-e, from whence it is slightly 

 curved inward to its tip; discal transverse vein straight, parted by 

 much less than its length from the border and by very much less than 

 its length from the flexure of the praebrachial ; alulae white ; halteres 

 piceous. Length of the body 3 lines ; of the wings 5 lines. 



113. Metopia instruens, n. s. Fam. Cinerea, capite subconico ar- 

 genteo micante, facie perobliqua, palpis antennis pedibusque nigris, 

 thorace vittis quatuor nigris, abdomine e maculis nigris trivittato, alis 

 cinereis. 



Female, Cinereous ; head brilliant silvery, almost conical ; face very 

 oblique ; facialia with bristles along each side ; epistoma not promi- 

 nent ; eyes bare ; palpi and legs black ; antennae reaching the epi- 

 stoma, 3rd joint linear, rounded at the tip, about six times the length 

 of the 2nd ; arista longer than the 3rd, stout to about one-third of its 

 length ; thorax with four black stripes ; abdomen with three rows of 

 triangular black spots ; wings cinereous ; veins black ; praebrachial 

 vein forming an obtuse angle, and emitting a branch at its flexure, 

 slightly curved inward from thence to its tip ; discal transverse vein 

 straight, parted by more than its length from the border and from the 

 flexure of the praebrachial ; alulae white. Length of the body 3 lines ; 

 of the wings 5 lines. 



Subfam. Dexides, Walk. 

 Gen. Dexta, Meigen. 



114. Dexia basifera, n. s. Fcem. Testaceo-alba, capitis antici la- 

 teribus palpisque fulvis, oculis nvulis, antennis pallide luteis, tho- 

 race vittis quatuor nigris, abdomine fulvo fusiformi maculis trigonis 

 nigris, macula fasciaque testaceis, pedibus nigris longis, femoribus 

 fulvis apice nigris, tibiis ex parte fulvescentibus, alis cinereis apnd veniis 

 nigricantibus, fascia basali obliqua alba, alulis albis. 



Group of D. longipes. 



Female. Testaceous white, narrow, bristly ; head somewhat prominent ; 

 frontalia black, slightly widening towards the epistoma, with a few 

 long stout black bristles on each side; facialia without bristles; epi- 

 stoma not prominent ; sides of the peristoma tawny nnd slightly pro- 



LTKN. PROC. — ZOOLOGY. 9 



