MB. WALKEB, ON DIPTERA COLLECTED AT AIAKESSAE. 167 



Male. Body very slender. Head much broader than the thorax ; front 

 rather narrow ; face vertical, flat ; eyes large, prominent. Antennae 

 very short ; 3rd joint conical, longer than the 2nd ; arista pubescent. 

 Thorax rather small. Abdomen clavate, about twice the length of the 

 thorax, cylindrical and very slender till near its tip. Legs slender ; 

 anterior legs short ; hind legs rather long. Wings very narrow ; dis- 

 cal transverse vein straight, upright, parted by more than its length 

 from the border, and by more than four times its length from the 

 prsebrachial transverse. 



221. GoBRYA BACCHOiDES, n. s. Mus. Cyanea, nitens, antennis pe- 

 dibusque pallide flavis, abdomine nigro fasciis duabus flavis, femoribus 

 posterioribus tibiisque posticis nigris, tarsis posticis basi nigris, alis 

 vix cinerascentibus, halteribus flavis apice nigris. 



Male. Blue, shining ; proboscis, antennae, and legs pale yellow ; abdo- 

 men black, with two pale yellow bands, the hind one very slender ; 

 posterior femora and hind tibiaj black, the former pale yellow at both 

 ends ; middle tibiae and tarsi wanting ; hind tarsi black towards the 

 base ; wings hardly greyish, apical third part brown ; veins black ; 

 halteres pale yellow, with black knobs. Length of the body 2| lines ; 

 of the wings 4 lines. 



Subfarn. Oscinides, Holiday. 

 Gen. OsciNis, Fabr. 



222. OsciNis FEMORATA, u. s. Mas. Atra, nitens, capite nigro-cya- 

 neo, femoribus anterioribus basi, tibiis anterioribus apice, tarsis hal- 

 teribusque flavis, femoribus posticis incrassatis, alis cinerascentibus. 



Male. Deep black, shining ; head bluish-black ; abdomen conical, shorter 

 than the thorax ; legs black ; anterior femora at the base, anterior 

 tibias at the tips, and tarsi yellow ; hind femora incrassated ; wings 

 greyish ; veins black ; discal transverse vein straight, upright, parted 

 by more than its length from the border, and by much more than its 

 length from the praebrachial transverse ; halteres yellow. Length of 

 the body li line ; of the wings 2 lines. 



Gen. PiOPiiiLA, Fallen. 



223. PioPHiLA coNTECTA, H. s. F(£m. Nigra, nitens, oviductu lan- 

 ceolato, pedibus halteribusque fiilvis, pedibus anticis nigris, femoribus 

 basi fulvis, alis einereis. 



Female, Black, shining ; oviduct prominent, lanceolate ; legs and hal- 

 teres tawny ; fore legs black ; coxa;, femora at the base and knees 

 tawny ; wings grey ; veins black ; discal transverse vein straight, 

 upright, parted by less than its length from the border, and by more 

 than its length from the praebrachial transverse. Length of the body 

 2 lines ; of the wings 4 lines. 



