THE CANADIAN ENTOMOLOGIST. 139 



darker towards tip, slender, not lamelliform, fringed with black hairs out- 

 wardly and at apex, at basal third a sudden swelling, then of regular 

 width to the triangular clavate apex. Venter concolorous with the rest 

 of the abdomen. Pleura piceous, glaucous. Coxie more or less dark- 

 ened, except at tips ; fore coxa3 less blackened on anterior and posterior 

 surfaces, with short, black hairs besides the long apical bristles ; middle 

 coxse with usual apical brush of hairs. Legs yellow, slightly infuscated 

 towards tip of tarsi ; first joint of fore tarsi in length equal to the three 

 following together, of the middle tarsi the first joint equals the next two 

 and half of the third following joints, the hind metatarsus is shorter than 

 the joint next following ; posterior femora with a single apical bristle. 

 Wings sul)hyaline, third vein slightly and gradually converging towards 

 the fourth ; anal angle rounded ; posterior cross-vein perpendicular to 

 proximal segment of the fourth vein. Tegular cilia black, tegulae and 

 halteres yellow. 



One male, from Clementon, N. J. ; collected by Mr. C. W. Johnson, 

 May 30, 1897. 

 5. Hercostomus anarmostus, n. sp. (Fig. 3.) 



Male. — Length 3.5 mm., length of wing 3.25 mm. Face rather 

 broad, gray-dusted. Palpi and proboscis piceous. Antennae black, third 

 joint lengthened, flat above, rounded below, rather acutely pointed, bearing 

 the dorsal arista. Vertex dark greenish, opaque. Post-ocular bristles 

 black. No beard present. Thorax shining, dark green, with usual 

 bristles. Scutellum concolorous, sparsely bristly, and with a marginal 

 row of a few short bristles in addition to usual two. Abdomen green, 

 somewhat brassy, incisures not darkened. Hypopygium piceous, pub- 

 escent, its cardiform plate bristly ; internal appendages lengthened, red- 

 dish; penis pointed; lamella infuscated, crescent-shaped, much thickened 

 at middle and evenly attenuated to the tip, covered and fringed externally 

 with short black hairs, apex narrowly but distinctly margined with black. 

 Pleura and coxas, except tips, green, overlaid with glaucous. Front coxse 

 with black hairs anteriorly ; middle coxa^ with fewer hairs than 

 usual. Legs infuscated, especially on upper side of all the femora, tip of 

 hind tibia}, and fore tarsi from tip of first joint ; middle tarsi from apex 

 of first joint black. Metatarsus of fore legs a little shorter than three 

 following joints, of middle equal to two following, of hind legs shorter 

 than next joint and with a few short bristles below. Wings subhyaline, 

 slightly tinged with yellow anterior to third vein and bordering each vein ; 



