NORTH AMERICAN COLEOPTERA. 97 



Ps. cselatns Lee. — Ovate, robust, broader behind, convex, piceous, shining ; 

 legs reddish brown. Antennse pale. Head rather closely verrucose. Clypeus 

 broadly triangularly emarginate, the angles each side obtuse, the sides arcuate, 

 slightly sinuate before the genae which are obtuse. Thorax fully twice as wide 

 as long, not narrower in front, anterior angles obtuse, sides feebly arcuate, mar- 

 gin entire, hind angles obtuse, base arcuate, the marginal line rather deep, disc 

 convex, a deep postapical groove, a second near the middle of the declivity ex- 

 tending upwards nearly to the median line of the thorax, the median line of 

 thorax impressed posteriorly, the surface with very coarse deep punctures sparsely 

 and irregularly placed, the sides quite smooth. Elytra oval, inflated, at base as 

 wide as thorax, humeri rounded, disc deeply striate, striaj moderately closely 

 punctured, intervals convex, smooth. Mesostemum opaque, scabrous. Meta- 

 sternum short, smooth. Abdomen smooth, with an indistinct row of coarse 

 punctures across each segment and a few, more distinct, at the sides. Posterior 

 femora stout, oval, the marginal line distinct, a row of coarse setigerous punc- 

 tures parallel with it, the tibife stout, smooth on the outer side, with two oblique 

 ridges, the upper feeble, the lower well developed, the spurs cylindrical, but 

 slender, obliquely truncate at tip, the tarsi short, the first joint elongate trian- 

 gular. Length .12-.14 inch ; 3-3.5 mm. 



In a species like the present it is difficult to describe the thoracic 

 sculpture in a manner to apply to even the majority of specimens. 

 In a general way there are seen when viewed laterally two grooves, 

 the first is immediately postapical and is entire, except for a short 

 space at middle, the second groove is usually deeper and broader, 

 extending from a short distance above the lateral margin toward the 

 middle, but more widely interrupted than the first groove, the disc 

 is thus divided into three unequal portions, the basal the broadest. 

 The impression of the median line is also variable, the anterior por- 

 tion is usually fine, the posterior filled with closely placed punctures. 



The elytral striae vary in punctuation in a manner suggestive of 

 sexual difference, that is, some specimens are a little less inflated and 

 have the striae more distinctly punctured, others are more robust in 

 form, the striae rather finer and the punctures decidedly so. The 

 body is apterous. 



Occurs on the sea-shore near San Francisco, Cala. 



Ps. hydropiciis n. sp. — Ovate, much broader behind, convex, rufoferru- 

 ginous, shining. Head coarsely and closely verrucose. Clypeus broadly and 

 feebly triangularly emarginate, the angles on each side obtuse, sides arcuate, 

 gense scarcely prominent beyond the eyes. Thorax twice as wide as long, dis- 

 tinctly narrower in front, anterior angles obtuse, sides arcuate, the margin entire, 

 hind angles broadly rounded, base arcuate, the marginal line entire, but fine and 

 indistinct, disc convex, very shining, the surface somewhat irregular near the 

 front angles, but without grooves, the upper portion of disc, sparsely punctate, 

 the punctures coarse and indistinct. Elytra broadly oval, nearly as broad poste- 

 riorly as long, as broad at base as the thorax, humeri broadly rounded, disc striate, 



TRANS. AMEK. ENT. SOC. XIV. (13) APRIL, 1887. 



