SYNOPSIS OF NORTH AMERICAN SYRPHID^. 221 



Pocota grandis (Plato, X, figs. 7, 7a.) 



Hadroimjia (jrundis Williston, Can. Ent., xiv, 79. 

 Brachypalpus Morrisoni Bigot, Anuales Soc. Ent. for 1883,355. 



Hahitat. — Wasbingtou Territory! 



$. Leugtli, 22 tol*3""", of wiugs 17""™. Brassy-black, shining. Front 

 black, densely clothed with yellowish-gray pollen, and with short yel- 

 low pile, intermixed with black at the vertex. Autennse brownish-red, 

 blackish toward tiie base. Face whitish-yellow, thickly covered with 

 whitish pollen ; in the middle below the antennae the ground color is 

 obscurely blackish; cheeks black, shining. Dorsum of thorax in front 

 of the wings, and the i)leunie, densely clothed with short yellow pile. 

 Posterior half of thorax, the scutellum and the first tliree segments of 

 abdomen with thick, short, black pile; fourth and fifth segments with 

 longer yellow ])ile. Legs black, with short black pile ; knees slightly 

 leddish ; front tibia? in front, the til) of hind tibite, and the front and 

 hind tarsi yellowish-red, with short, thick, golden pile ; middle tarsi 

 reddish. Wings hyaline, costal and sub-costal cells yellowish. 



One specimen. 



BRACHYPALPUS.* 



Brachypalpus Mafquart, Hist. Nat. Di])t., i, 523,1834. 

 Dark colored species, the body wholly without yellow markings, 

 moderately or thickly pilose. Head and wings as in Pocota, but the ab- 

 domen narrower than the thorax, elongate; hind femora somewhat, 

 usually much, thickened and elongate. Type of genus, B. varus Panzer. 

 Europe. 



TABLE OF SPECIES. 



1.— Hind femora with short bristles below; abdomen with brilliant metallic cross- 

 bauds (Ca/Zijjro&o/a) 4 



Hind femora not with bristles below; abdomen uniformly black 2 



2. — Legs wholly black Rileyi 



Legs in part yellow 3 



3. — Second and third abdominal segments each with a broad, posterior, opaque cross- 

 band ; smaller species parvus 



Abdomen not with such cross-bands ; larger species frontosus 



4. — Dorsum of thorax yellow pilose sorosis 



Dorsum chiefly black pilose pulcher 



Brachypalpus frontosus. (Plate X, fig. 8.) 



Brachypalpus frontosus Loew, Centur., x, 50. 



Habitat. — District of Columbia, Pennsylvania ! 



S , 9 . Length, 10 to 12=™. Black, shining, clothed with whitish, or 

 obscurely yellowish-white inle. Eyes of male very briefly contiguous, 

 frontal triangle covered with yellowish-whitish pollen ; front in the fe- 

 male broad, with a median white pollinose fascia ; obsolete in the middle. 

 Antennse reddish brown or blackish ; first two joints a little elongate, 



fipaxvi, short; palpus. 



