356 LIST OF DIPTERA. 



angle, and proceed in a course parallel to the side of the chest; 

 middle stripe slender and linear : breast covered with a hoary bloom, 

 and clothed with long white hairs : abdomen convex, shining, de- 

 creasing in breadth from the base to the tip, narrower than the 

 chest and about twice its length, clothed on each side of the tip 

 with black hairs, and with longer white hairs towards the base; 

 hind border of every segment adorned on each side with a large 

 patch of hoary down ; first segment very short ; second segment 

 broad, short, more convex than the rest ; third segment long, 

 crossed by a furrow near its fore border ; the following segments 

 successively decreasing in length : legs black, shining ; hips and 

 thighs clothed with long white hairs, and the latter having shorter 

 black hairs towards their tips ; shanks and feet clothed with shorter 

 black hairs and with black bristles : shanks for more than one-third 

 of their length from the base , and each foot-joint at its base bright 

 tawny ; claws tawny, black towards the tips ; foot-cushions tawny ; 

 fore legs unarmed ; hind shanks slightly club-shaped ; hind feet 

 rather broad : wings colourless, slightly gray towards the tips ; 

 wing-ribs piceous ; veins black, piceous towards the base, where 

 they are bright tawny ; poisers tawny, with yellow knobs. Female. 

 — Like the male, but larger : sixth joint of the feelers more slender 

 and like a short bristle : tip of the abdomen armed with short black 

 spines : the tawny colour does not extend beyond the base of the 

 shanks, and the foot-joints are nearly all black. Length of the 

 body 5 — 6 lines ; of the wings 9 — 10 lines. 



a. Nova Scotia. From Lieut. Redman's collection. 



Dasvpogon Macerinus, n. s. Niger, lateribus abdominis apice ven- 

 treque ferrugineis, thorace cano trivittato, antennis ferrugineis 

 apice nigris, pedibus nigris, tarsorum articulis basi tibiisque 

 ferrugineis, alis limpidis, basi costa venarumque marginibus 

 apice fuscis. 



Body black, dull : head full as broad as the chest, clothed with 

 long white hairs : tubercle of the eyelets beset with some black 

 bristles: front dark red, covered with hoary down : eyes cupreous ; 

 front part flat, composed of very large facets, and quite distinct from 

 the convex part of the little facets: lip black, short, ferruginous, and 

 clothed with short black hairs at the tip : first and second joints of 

 the feelers ferruginous, beset with black bristles ; first joint linear ; 

 second joint club-shaped, a little shorter than the first ; third joint 

 black, slightly tapering from the base to the tip, as long as the first 

 and the second, but much more slender : chest black, very dark fer- 

 ruginous on each side, thinly clothed with hoary hairs, adorned with 

 three slender indistinct hoary stripes, beset on each side with black 





