DIPTEKA. 245 



Genus ERISTALTS, LatreiUe. 



Eristalis floridus, Mas. 



Ater, thorace viltis quatuor cijaneo-cinereis ornato, ahdomine maculis sex 

 ferrugineis ci/aneo-cinereo ornatis, segmentorum 21, 3t et 4i margini- 

 Itis posticis flavis, antcnnis riifis, pedibus nigris, femorihus posticis 

 crassis, alls suhcinereis nigro maculatis rel fasciatis. 



Black : head tinged with gray, cU)thed with pale hairs ; face adorned 

 with a pale buflf tinge ; tul)ercle of the eyelets black and clothed with black 

 hairs: eyes red, thickly clothed with short black hairs: mouth black: feel- 

 ers red : chest deep black , clothed with black hairs, adoi-ned with fo7ir bluish- 

 gray stripes; sides clothed with pale buff hairs; hinder border of the 

 scutcheon dark ferruginous : breast tinged with gray : abdomen obconical, 

 shining, not longer than the chest, clothed with hoary hairs, and on each 

 side towards the base with short black hairs, adorned with three pairs of 

 large dark ferruginous spots ivhich are overspread ivith bluish gray bloom ; 

 hind borders of second, third, and fourth segments pale yellow : legs clothed 

 with short black hairs ; knees ferritginous ; shanks and feet covered be- 

 neath with ferruginous down ; claws tawny towards the base ; foot- 

 cushions tawny ; hind-thighs thick ; hind-shanks curved : wings slightly 

 gray ; a small blackish spot beneath the middle of the fore border, sometimes 

 extending across the wing ; wing-ribs pitchy ; veins black, pitchy at the 

 ])ase ; alulee slightly tinged with gray, their borders pitchy and fringed 

 with white hairs ; poisers tawny. Length of the body 4 — 4^ lines ; of the 

 wings 8 — 9 lines. 



Brazil. 



Eristalis solennis, Mas. 



Niger, capite scutello abdomineque fulvis, hujiis vitla apiccr/ne nigris, an- 

 tennis rufis, pedibus nigris, libiis piccis basi flavis, tibiis intermediis 

 fulvis, alis sublimpidis ad costam subfilvis. 



Head taumy, clothed with pale yellow hairs, ferruginous above the 

 feelers where the hairs are black ; face convex in the middle along most 

 part of the length : eyes red ; facets above larger than those elsewliere : 

 sucker pitchy: feelers red: chest and hrcasf black, clothed with tawny 



2 K 



