APPENDIX 



TO 



THE ZOOLOGIST 



FOR 1850. 



Art. I. — Characters of undescribed Diptera in the British Museum. 

 By Fbancis Walker, Esq., F.L.S. 



Tabanus Pyrausta, fern. 



Ferrugineus, abdomine nigro, segmentorum marginibus posticis fulvis, palpis anten- 

 nis pedibusque nigris, alis fulvis. 



Head ferruginous, tawny and clothed with dark tawny hairs beneath: eyes 

 bronzed, parted above by a very narrow interval ; the facets small, but much in- 

 creasing in size towards the inner fore border: sucker black, clothed with black hairs ; 

 lancets dark ferruginous ; palpi black, covered with black down : feelers black ; third 

 joint slightly convex beneath, armed above with a short stout horn, which forms an 

 acute angle and tapers gradually from the base to the tip ; compound joint slightly 

 curved upward, much shorter than the third joint : chest and breast adorned with a 

 bright ferruginous covering, the latter rather paler than the former and clothed with 

 tawny hairs : abdomen black, obconical, clothed with short black hairs, much longer 

 and a little broader than the chest ; hind borders of the segments bright tawny : legs 

 black, clothed with short black hairs; foot-cushions tawny: wings bright tawny; 

 wing-ribs and veins ferruginous ; curve of the tip cross-vein slight, not angular ; scales 

 tawny ; poisers red. Length of the body 11 lines ; of the wings 22 lines. 



Java. 



Tabantjs tenens, fern. 



Cinereus, thoracis lateribus abdomineque ferrugineis, hujus vitta cinerea, antennis 

 pedibusque ferrugineis, femoribus cinereis, tarsis piceis, tarsis anticis nigris, 

 alis cinereis basi costa nervorumque marginibus Jlavo-fuscis. 



Body gray : head adorned above with a tawny covering, which is interrupted by a 

 club-shaped pitchy mark, paler and clothed with yellow hairs beneath : eyes bronzed, 

 parted above by a moderate interval ; the facets very small, but slightly increasing in 

 VIII. APPENDIX. A A 



