NEW NORTH AMERICAN PSELAPHID^l. 465 



two-thirds as long as the elytra, nearly as wide as the latter; first segment 

 when viewed vertically, occupying three-fourths of the entire length, feebly 

 convex; border narrow, flat; basal carinas strong, very feebly divergent, 

 slightly more than one-half as long as the segment, separated by one-half 

 the entire width. Legs rather long and slender. Length 1.3-1.5 mm. 



Texas (Galveston 8). 



The above described type is a male. In this sex the 

 middle femora are very singularly modified, being very 

 strongly swollen, abruptly constricted near the apex, im- 

 pressed anteriorly, with an anterior tooth near the apex 

 and just before the deep apical constriction. In the female 

 the femora are all simple and rather slender, and the seventh 

 antennal joint is smaller than the eighth. The female is, 

 in addition, smaller than the male, and has the dorsal 

 carinas of the abdomen distinctly shorter. 



I have dedicated this very distinct species to a friend, 

 the author of the genus, and one to whom our systematic 

 knowledge of the American representatives of the family is 

 greatly indebted. 



BEYAXIS Leach. 



B. arizon<£ n - sp. — Form rather slender, pale testaceous throughout; 

 shining, not distinctly punctate; pubescence very fine, short and rather 

 sparse. Head moderate, triangular; eyes large, prominent; occipital foveas 

 on a line just before the middle of the eyes, mutually more than twice as 

 distant as either from the eye; apical fovea equal to the occipital, slightly 

 less distant from either of the others than the mutual distance of the latter; 

 connecting channel almost obsolete; antennas slender, slightly longer than 

 the head and prothorax together, joints three and five each nearly twice as 

 long as wide, distinctly longer than the fourth and equal in length to the 

 second, the latter more robust, seventh distinctly shorter than the sixth, 

 slightly longer than wide, eighth, ninth and tenth distinctly wider than long, 

 increasing uniformly and very rapidly in size, eleventh wider than the tenth, 

 much longer than wide, obliquely acuminate. Prothorax widest at the mid- 

 dle; sides rounded anteriorly, rather deeply sinuate posteriorly; base broadly, 

 very feebly arcuate, five-sixths as wide as the disk, nearly one-half wider 

 than the apex; the latter very feebly arcuate; disk distinctly wider than long, 

 equal in width to the bead, convex; middle fovea slightly smaller than the 

 lateral, the former at one-fifth, the latter at nearly one-third the length from 

 the base. Elytra at the humeri very slightly wider than the pa-othorax, at 



33— Bull. Cal. Acad. Sci. U. 8. Issued August 2, 1887. 



