292 Mr. F. Walker's Characters of undescrihed Diptera 



Genus Volucella, GeoflTr. 

 Volucella aperta. 

 Mas. — Picea, nitens, capite fiilvo macula, frontali piced, antennis 

 ferrugineis, thoiace vittis tluabus lateialibus fulvis valde in- 

 distinctis, scutello fulvo, abdomine testaceo apice nigro, alis 

 cinereis, venulis transversis mediis nebulosis. 

 Male. — Piceous, shining: bead tawny, with a piceous spot on 

 the front ; epistoma very prominent ; antennae ferruginous, seated 

 on a small tubercle, which is beset with short black bristles ; 

 thorax with a very indistinct tawny stripe on each side ; scutellum 

 tawny; abdomen testaceous, black towards the tip; legs tawny; 

 tarsi black towards the tips ; wings grey ; veins black ; transverse 

 veinlets in the middle somewhat clouded. 



Length of the body 5^ lines ; of the wings 12 lines. 

 Mexico. 



Genus Temnocera, St. Farg. et Serv. 

 Temnocera v'lr'idula. 

 Mas. — Testaceo-viridis, nitens, antennis testaceis, ihorace ma- 

 culis duabus magnis (uni antica, alterd postica.) nigricanti- 

 bus, scutello abdominisque segmenfis viridibus, nigro-mar- 

 ginatis, tibiis tarsisque nigris, alis sub-cinereis, gutta costali 

 nigra. 

 Male. — Testaceous-green, shining : antennae testaceous ; thorax 

 with a large blackish spot in front and another on the hind border ; 

 scutellum green, its hind border and the metathorax black ; ab- 

 domen green, its segments with black borders ; tibiae and tarsi 

 black; wings greyish, a little darker exteriorly; a black dot on 

 the costa beyond the middle ; veins black. 



Length of the body 4 lines ; of the wings 8 lines. 

 Mexico. 



Temnocera unilecta. 

 Fcem. — Nigra, nitens, non lata, antennis piceo-nigris, thorace 

 nigricante cupreo, tarsis posterioribus basi ferrugineis, alis 

 cinereo-fuscis basi pallidioribus, venulis transversis riigro- 

 nebulosis, halteribus apice niveis. 

 Female. — Black, shining, not broad : epistoma very prominent ; 

 antennae piceous-black ; thorax blackish-cupreous; posterior tarsi 

 ferruginous at the base ; wings cinereous-brown, paler towards 

 the base ; veins black ; transverse veinlets clouded with black ; 

 halteres with white knobs. 



Length of the body Sg lines ; of the wings 7 lines. 

 Mexico. 



