26 Families and Genkka of 



18. Face distinctly convex in profile, swollen or gibbose.* 19 



Face flattened or gently convex 20 



IQ. Thickly pilose species ; the gibbosity of the face reaches to the 



base of the antennae ; anal cell usually open * Cyutopogon 



Thinly pilose, more poUinose species, the convexity of the face 



on the lower part, anal cell usually closed. . Daulopocon 



20. Abdomen elongate; front broad anteriorly, narrow behind. 



Plesiomma 

 Front not narrowed behind. ...... 21 



21. Hind tibiae toward tlietip, and their metatarsi, much thickened. 22 

 Hind tibia! not, or but slightly, thickened toward the tip ; meta- 

 tarsi not thickened. 23 



22. Head much broader than high, transverse, "goggIe"-like ; abdo- 



men short, wings large Holcocephala 



Head only moderately broader than high, not at all spectacle- 

 like in appearance Holopogon 



23. Abdomen with thick recumbent pile above; thickly pilose spe- 



cies ; antennas slender. ..... Pycnopogon 



Abdomen without such pile above. . . . . .24 



24. Slender, nearly bare species ; face perpendicular, straight or gen- 



tly concave, narrowed above, bare, except on oral margin. 25 



Face gently rounded, not prominent below, in large part hairy, 



not or but slightly narrowed above. .... 26 



25. Thickly whitish pollinose; abdomen flattened, usually reflected 



upward, third joint of antennse and style both slender. 



Stichopogon 



Less thickly pollinose ; abdomen cylindrical, a little broader at 



base; third joint of antenna; short, broad, style minute. See 



Habropogon bilineatus Will. 



26 Large, elongate species, style of antennsv short . Callinicd.-> 



Moderately large, not much elongate 27 



27. Abdomen broader at the base, depressed ; thorax much convex 

 above, antennte slender, style long and slender (compare spe- 

 cies of Cyrtopogon). .... Amsopogon 



* Several species are placed provisionally under Cyrtopogon in which 

 the facinl gibbosity is small, aud the body thinly pilose. They may be dis- 

 tinguished by the abdomen not being broad, and having white pollinose 

 crosS'bands; in some the wings have Small but distinct clouds on the cross- 

 veins. 



