1086 LIST OF DIPTERA. 



die cross-vein straight, short, slightly oblique ; lower cross-vein 

 straight along the upper half of its course, and then forming two 

 angles (the upper outward and slightly obtuse, the lower inward and 

 very obtuse), parted by full twice its length from the middle cross- vein 

 and from the tip of the wing, and by less than half its length from 

 the hind border ; poisers tawny. Length of the body 2\ — 2\ lines ; 

 of the wings \\ — 5 lines. 

 a. Monte Video. Presented by C. Darwin, Esq. 



Tetanocera Struthio, Barnstoris MSS., mas et fern. Ferruginea, 

 capite fulvo lateribus nigro bimaculatis, facie palpisque flavis, 

 thorace Jiavo quadrivittato, antennis fulvis, pedibusjlavis, femori- 

 bus anlicis apice tarsisque piceis, alis fulvis costa venisque trans- 

 versis fusco nebulosis. 



Body ferruginous : head and chest beset with a few stout black 

 bristles ; head bright tawny, adorned with a black spot on each side 

 between the feelers and the eyes ; face pale yellow ; its sides without 

 bristles ; epistoma slightly prominent: eyes black, convex, the facets 

 very small : sucker ferruginous, clothed with tawny hairs ; palpi 

 yellow, beset with black bristles : feelers bright tawny, as long as the 

 head; first joint very short ; second beset with black hairs and bris- 

 tles, increasing in breadth from the base to the tip, more than twice 

 the length of the first ; third a little longer than the second, straight 

 beneath, forming an angle above at the insertion of the bristle, 

 whence it abruptly tapers to the tip ; bristle black, stout, a little 

 longer than the third joint, from which it proceeds at one-third of 

 the length from the base, thickly feathered to the tip with rather long 

 black hairs : chest adorned with four pale yellow stripes, its sides 

 and the breast tinged with pale yellow : abdomen nearly linear, 

 thinly clothed with black hairs, a little narrower and much longer 

 than the chest : legs yellow, beset with black hairs and bristles ; 

 shanks darker than the thighs ; feet and tips of the fore thighs 

 pitchy: claws black: wings tawny, brown along- the fore border; 

 cross-veins clouded with brown ; wing-ribs and veins tawny ; longi- 

 tudinal veins straight ; middle cross-vein straight ; lower cross-vein 

 parted by near twice its length from the middle cross-vein, and from 

 the end of the fourth longitudinal vein, and by nearly half its length 

 from the end of the fifth longitudinal vein, having two curves, the 

 upper outward, much larger than the other, which is inward ; poisers 

 pale tawny. Length of the body 4 lines ; of the wings 7 lines. 



Var. j3. Two rudiments of veins clouded with brown on the fourth 

 longitudinal vein between the cross-veins. 



a. St. Martin's Falls, Albany River, Hudson's Bay. Presented by 



G. Barnston, Esq. 



b. North America. Presented by the Entomological Club. 



