LIST OF DIPTERA. 151 



borders and sides of the segments tawny : legs tawny ; hips paler, 

 with a hoary bloom ; feet piceous : wings with a slight grayish 

 tawny tinge ; veins brown, darker along the fore border, tawny to- 

 wards the base ; poisers yellow. Length of the body 9 lines ; of 

 the wings 16 lines. 



a. Congo. 



Tabanus derivatus, n. s., mas. Rufus, thorace cano obsolete trivit- 

 tato, antennis pedibusque fulvis, tibiis anticis tarsisque apice tar- 

 sisque anticis omnino fulvis, alis cinereo-fulvis. 



Body red : head beneath and breast covered with a hoary 

 bloom, and clothed with whitish hairs : mouth brown ; feelers and 

 palpi tawny ; third joint of the former with a very short angle : chest 

 with four very indistinct hoary stripes that occupy almost the whole 

 back : legs red ; hips covered with a hoary bloom ; fore feet and 

 tips of fore shanks and of four hinder feet black : wings pale gray- 

 ish tawny, darker along the fore borders; veins piceous ; poisers 

 tawny. Length of the body 9 Hues ; of the wings 18 lines. 



a. North America. From Mr. Children's collection. 



| Tabanus ferreus, n. s., mas. Ferruginens, capite subtus fulvo, pedi- 

 bus piceis, alis Jlavo-fuscis, apicibus marginibusque posticis 

 cinereis. 



Body ferruginous : head dull tawny and clothed with black 

 I hairs beneath : eyes brassy : palpi piceous : sucker and feelers 



black ; first and second joints of the latter clothed with black hairs ; 

 i third long, curved, armed at the base with a long curved horn : 

 | chest and breast clothed with short black hairs : abdomen paler be- 

 | neath ; hind borders of the segments clothed with pale tawny hairs : 

 ! legs piceous : wings yellowish brown, gray at the tips and along the 



hind borders ; veins ferruginous ; poisers brown, with tawny tips. 



Length of the body 9 lines ; of the wings 18 lines. 



a. Brazil. Presented by Sir C. Stewart. 



Tabanus univentris, n. s., fern. Fulvus, capite subtus flam, thorace 

 fusco trivittato, abdomine ferrugineo apice fusco, pedibus piceis, 

 tibiis fulvis, alis cinereis basi marginibusque anticis fulvis. 



Head tawny, with an oblong brown shining spot in front 

 between the eyes, pale yellow beneath and clothed with hairs of the 

 same colour: eyes black: palpi pale reddish brown, clothed with 

 short yellow hairs ; lancets ferruginous ; sucker piceous : feelers 

 piceous ; first and second joints very short, each forming an angle 

 above ; third long, pointed, much curved, with an angle above at 



