850 LIST OF DIPTERA. 



beset with black bristles : feelers ferruginous, shorter than the face ; 

 third joint tawny towards the base and beneath, very slightly de- 

 creasing in depth from the base to the tip, which is rounded, less 

 than twice the length of the second joint ; bristle black, slender, 

 feathered for full half the length, stout at the base, much more than 

 twice the length of the third joint : chest and breast gray : chest 

 with a slight tawny tinge: abdomen elliptical, not longer nor 

 broader than the chest, adorned with a dull tawny covering ; a 

 slight black stripe along the back : legs black ; foot-cushions 

 pitchy ; thighs and shanks tinged with gray : wings slightly gray ; 

 wing-ribs tawny ; veins black, tawny at the base ; tip cross-vein 

 forming a right angle with the fourth longitudinal vein, curved in- 

 ward near the base, straight from thence to the tip, joining the bor- 

 der at some distance above the tip of the wing ; lower cross-vein 

 very slightly curved near the base, straight from thence to the tip ; 

 scales whitish, with pale yellow borders. Length of the body 2 

 lines ; of the wings 4 lines. 

 a. ? Presented by the Entomological Club. 



Dexia Sermyla, n. s. Cinerea, capite albo, thorace vittis quatuor 

 nigris, pectore cano, abdomine cano micante subtus ferrugineo 

 apice compresso, palpisfuhis, antennis basi ferrugineis, pedibus 

 nigris, tibiis ferrugineis, alls sublimpidis . 



Body black, clothed with black hairs and bristles : head co- 

 vered with white lustre, thickly clothed behind and beneath with 

 yellowish white hairs ; epistoma not prominent ; sides of the face 

 fringed with bristles at the base : eyes dark red : sucker tawny, 

 clothed with yellow hairs ; palpi tawny, beset with black bristles : 

 first and second joints of the feelers ferruginous: chest gray, with 

 the exception of four slender black stripes ; breast hoary : abdomen 

 about thrice the length of the chest, spindle-shaped, dark ferrugi- 

 nous beneath, compressed, tapering, and thickly beset with long 

 bristles toward the tip, adorned with hoary reflections, which are 

 chiefly on each side : legs black, clothed with black hairs and 

 bristles ; thighs tinged with gray, shanks dark ferruginous ; foot- 

 cushions yellow ; claws dark tawny, with black tips : wings nearly 

 colourless, rather narrow ; wing-ribs tawny ; veins black, yellow at 

 the base ; tip cross-vein forming a right angle with the fourth lon- 

 gitudinal vein, slightly curved inward at the base, straight from 

 thence to the tip, joining the border at some distance above the tip 

 of the wing ; lower cross-vein with two very slight curves, the lower 

 inward, the other outward ; scales white, with pale yellow borders. 

 Length of the body 6 lines ; of the wings 10 lines. 

 a. Brazil. 



