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PROCEEDINGS OF THE NATIONAL MUSEUM 



Antenna shorter, exceeds tip of hind angle by no more than 1 segment; 

 sides of pronotum subparallel; nasale much wider than high. 



34. obscuratus 



27(21). Elytron more than 5 mm 28 



Very small species, elytron less than 4.5 mm; nasale flat; frontal margin 

 rounded, moderately thin and jutting; pronotal punctures nearly as 

 large as those on front; parantennal and mandib\ilar foveae relatively 

 large; southeast U.S. to Texas 42. insipiens 



28(27). Pronotal punctures and vestiture uniform except usual small increase 



in density and size along sides 29 



Pronotal punctures change from rather sparse anteriorly to smaller and 

 denser along posterior border, vestiture also becomes fine over same 

 area; antenna of d" exceeds tip of hind angle by no more than one-half 

 segment, 9 antenna shorter; cf aedeagus broad; paramere with small 

 apical blade; elytron about 8.5 mm long 41. gradatus 



29(28). Parantennal fovea very large, as large or larger than antennal segment 3; 

 nasale large and protuberant, especially in cf ; frontal margin strongly 

 projecting, angular with blunt apex when viewed from above; elytron 

 8 mm or more; sides of pronotum straight behind anterior curvature 



and divergent posteriorly, pronotum wider than long 30 



Parantennal fovea clearly smaller than antennal segment 3; not with 

 above combination 31 



30(29). Frontal margin scarcely overhanging protruding nasale, not extended 

 in angular apex; pronotal punctures as large as those on front; cf 

 paramere with apical blade; elytron 8.9-11.2 mm . . 20. Sagittarius 

 Frontal margin overhanging nasale and usually curved down on sides 

 above nasale, margin extends out sharply and ends in truncated, 

 angular apex; pronotal punctures smaller than those on front; cf 

 paramere without apical blade; elytron 8.2-9.3 mm . . . 21. hyslopi 



31(29). Sides of pronotum straight behind small anterior curvature; hind angles 

 large and expanded, beginning at about center of pronotum and thence 



noticeably divergent, carina usually long and distinct 32 



Sides of pronotum concave or parallel from center to base of hind angles, 

 which arise well behind center; not with above combination of char- 

 acters 34 



32(31). Parantennal fovea and nasale large and well developed, nasale about as 

 high as wide; antenna not greatly elongate; smaller species, elytron 



7.5 mm or less 33 



Parantennal fovea and nasale weak, nasale wider than high; antenna 

 very long, exceeds tip of hind angle by 3-4 segments, flagellar segments 

 elongate and slender, 4 about twice as long as wide; pronotal punctures 

 about as large as those on front and separated by own diameter; apex 

 of last visible sternite slightly inflated; elytron 8.5-10 mm. 



24. difficilis 



33(32). Pronotal punctures smaller than those on front; frontal margin often 

 rounded in center; cf paramere expanded at base, abruptly rounded 



at tip 26. testaceus 



Pronotal punctures about same size as those on front (but widely 

 separated); frontal margin often coming to blunt point in center; 

 cf paramere slender, gently tapering to tip . . . . 27. trapezoideus 



34(31). Frontal margin thin, shelflike, and extending in front of nasale by 

 several times width of black rim, front with depression behind margin; 

 parantennal fovea small 35 



