NEW NORTH AMERICAN PSELAPHID^E. 475 



three to seven nearly equal in width, the former much longer than wide, the 

 latter distinctly wider than long, ninth to eleventh uniformly and rather 

 rapidly increasing in width, the ninth one-half wider than long, slightly 

 shorter than the tenth, the latter fully twice as wide as long, eleventh elon- 

 gate, accuminate, as long as the four preceding together. Prothorax widest 

 before the middle; sides rounded, convergent and feebly sinuate toward 

 base; the latter evenly and distinctly arcuate, four-fifths as wide as the disk 

 and one-half wider than the apex; disk convex, very slightly wider than long; 

 basal groove at nearly one-third the length from the margin, feebly, posteri- 

 orly arcuate, very deeply impressed; lateral foveas large, deeply impressed, 

 median posterior cusp shaped prolongation large and long; surface broadly 

 and very feebly impressed anteriorly from the lateral foveas, and with traces 

 of a narrow median canaliculation near the center of the disk. Elytra at the 

 somewhat prominent humeri distinctly wider than the prothorax; sides very 

 feebly divergent, strongly and evenly arcuate; disk about as long as wide, 

 convex; sutural strias deep, arcuate; discal fine, distinct, nearly parallel, ex- 

 tending to or very slightly beyond the middle; intermediate baBal fovea sim- 

 ple. Abdomen viewed vertically short and broad, three-fourths as long as 

 the elytra, distinctly narrower; sides straight, parallel, broadly rounded be- 

 hind; border rather narrow, inclined; first visible segment very slightly 

 longer than the second; basal carinas rather robust and flat, very feebly di- 

 vergent, less than one-third as long as the segment, distant by one-fourth 

 the abdominal width. Legs moderate in length; femora robust, much more 

 arcuate externally and toward apex, posterior more slender. Length 1.4 

 mm. 



California (Anderson Val., Mendocino Co. 1). 



The type is apparently a male, the penultimate segment 

 being transversely and narrowly impressed; the terminal 

 segment is flat, in appearance like a horizontal pygidium; 

 it is slightly longer than wide, oval, slightly more attenuate 

 behind, and entirely surrounded by the other segments. 

 The species is much more robust than the others here de- 

 scribed. 



A. testaceum n. sp. — Form slender, convex; pale testaceous throughout; 

 integuments polished, almost impunctate; pubescence very fine, short, 

 sparse. Head moderate, distinctly narrower than the prothorax; eyes 

 small, convex, prominent; genas not at all prominent, much longer than the 

 eye, rounded; occiput narrowly and deeply impressed in the middle; foveas 

 on a line through the posterior portions of the eyes, round, spongiose, 

 scarcely twice as distant as either from the eye, connected by an impressed 

 channel, which is more broadly arcuate than usual; antennas scarcely one- 

 half longer than the head, slender, nearly as in robustulum. Prothorax 



