464 CALIFORNIA ACADEMY OF SCIENCES. 



than wide, widest slightly before the middle; base two-thirds as wide as the 

 disk, one-fourth wider than the apex; median sulcation feebly impressed, 

 becoming obsolete at one-third the length from the apex; spines moderate; 

 ridges almost obsolete; lateral grooves broadly, feebly impressed; foveas 

 large and deep. Elytra fully as long as wide; humeri prominent, not 

 spinose. Abdomen nearly as wide as, but much shorter than the elytra; 

 basal cusps fine, strong, rather long, parallel, separated by one-fifth the ab- 

 dominal width. Legs long, slender; posterior tibiae with apical process. 

 Length 1.8 mm. 



Pennsylvania 1 (Mr. Henry Ulke.) 



This species is very distinct in the characters of the vertex 

 and antennae; the eleventh joint is here more than usually 

 developed, while the tenth is but slightly larger than the 

 ninth and of nearly the same form. 



DECARTHRON Brend. 



D, Brendeli n - S P- — Form somewhat robust, convex, piceo-castatieous 

 throughout; legs and antennae paler, rufous; pubescence rather long and 

 sparse, more dense on the abdomen and at the sides of the prothorax and 

 head; integuments polished. Head moderate, as wide as long, very feebly 

 convex, almost impunctate; eyes large, coarsely granulated, convex and 

 prominent; genes extremely short behind them; base wide, transversely 

 truncate; on a line through the anterior portions of the eyes there are 

 two widely distant nude foveae; antennal tuberculations large, distinctly 

 elevated; antennas as long as the hear! and prothor tx together, rather slen- 

 der, club rather large, basal joint cylindrical, slightly longer than wide, 

 second slightly shorter and narrower, third feebly obconical, as long as and 

 much narrower than the second, four to six subequal, very slightly longer 

 than wide, and just visibly wider than the third, seven larger, scarcely as 

 long as wide, eight very short, transverse, narrower than the seventh, ninth 

 much wider than the seventh, very feebly trapezoidal, nearly twice as wide 

 as long, tenth very slightly wider than the ninth, ovoidal, pointed, nearly as 

 long as the three preceding together. Prothorax scarcely as wide as the 

 head, very slightly wider than long; sides broadly rounded, convergent 

 and feebly sinuate toward base; the latter broadly arcuate, four-fifths as 

 wide as the disk, one-half wider than the apex; disk strongly, evenly con- 

 vex, not impressed at the sides, having a deep nude fovea in the middle near 

 the base. Elytra near the apex fully twice as wide as the prothorax; sides 

 strongly divergent, arcuate; disk wider than long, two-thirds longer than the 

 prothorax, convex, coarsely and extremely feebly punctate; sutural striae 

 deep, feebly arcute; disc 1,1 deeply impressed, feebly arcuate, parallel to the 

 suture, terminating at nearly two-fifths the length from the apex. Abdomen 



