296 ERNEST A. BACK. 



LASIOPOGON. 



Lasiopogon Loew, Linnaas Ent., II, 508, 1847. 

 Daulopogon Loew, Berl. Ent. Zeitsch., XVIII, 377, 1874. 



Black species of small to medium size, of comparatively 

 long body structure, and only moderately haired; with the 

 ground color more or less obscured by a grayish or brownish 

 bloom, which on the posterior portions of the abdominal seg- 

 ments is often grayish-white. Head of moderate breadth, 

 obviously broader than high; face broad, but clearly narrowed 

 above, on the lower half with a large protuberance which is 

 wholly covered with a long and moderately thick haired 

 mystax. Antennae (PI. IV, fig. 8) approximate, the first two 

 segments short, the second shorter than the first, both with 

 stout hair; the third segment elongate oval, of medium length, 

 a trifle longer than the first two segments taken together; 

 style distinct, bristle-like, a trifle less in length than one-half 

 the third segment, and terminated by a fine bristle. Vertex 

 broad, above much widened, saddle-shaped, hollowed out, 

 with three parallel deep longitudinal furrows, the middle one 

 of which begins at the anterior ocellus. The frontal orbits, 

 ocellar tubercle, and upper occiput along the orbits with hair 

 and bristles varying in number and stoutness. Ocellar tuber- 

 cle fairly prominent, palpi very bare. Thorax but little 

 arched, moderately hairy and with a varying number of well- 

 developed bristles; scutellum with bristles; the pleuras usually 

 without pile, but with well-developed trichostical hair. Ab- 

 domen cylindrical, flattened, moderately bare, the last seg- 

 ment of the male short; the male genitalia large, with large 

 forceps much as in Asilus; the last segment of the female 

 proportionately short, the under lamellae prominent, over- 

 lapping each other, with rounded ends. Legs rather slender, 

 the hind femora not much more slender than the front ones. 

 The first tarsal segment longer than the following ones but 

 still, properly speaking, not long; the stout bristles of the 

 tibiae and tarsi only of medium length, those on the femora 

 are very short and situated chiefly on the upper side toward 

 the tip. The front tibia without a terminal claw-like spur; 

 pulvilli normal. Wings usually grayish hyaline with all the 



