PTEROSTICHIN,E 375 



apex and slightly more oblique and broadly sinuate to the base, the mar- 

 gin sharply, evenly and not broadly reflexed; anterior impression deep, 

 the posterior obsolescent; inner fovea long, coarse and deep, attaining 

 base, the outer shallow, feebly punctate, delimiting a sharp carina along 

 the sides basally; elytra almost twice as long as wide, inflated and much 

 broader behind the middle, fully two-fifths wider than the prothorax; 

 striae fine, feeble or subobsolete externally, slightly impressed, distinct 

 and punctate internally, the scutellar moderately long but imperfect; 

 dorsal punctures two, just behind the middle and at apical fifth; female 

 with two apical abdominal punctures at each side. Length (9) 8.0 

 mm.; width 3.0 mm. Alaska (St. Paul I?land). 



This is a remarkably distinct species in general habitus, because 

 of the unevenly rounded, basally broadly sinuate sides of the pro- 

 thorax and the long and posteriorly inflated elytra. 



Cryobius delicatus n. sp.- -Body very small, narrow and elongate, 

 deep black and polished, without metallic lustre; femora bright rufous, 

 tibiae piceous, the tarsi black; head moderate, short, with very prominent 

 eyes, the sulci rather long, converging; antennae black, piceous basally, 

 rather thick; palpi black, tipped with testaceous; prothorax fully a third 

 wider than long, widest well before the middle, the sides broadly arcuate 

 and very moderately converging anteriorly, arcuately oblique in nearly 

 basal half, sinuate behind, becoming subparallel before the angles; base 

 not margined laterally, slightly narrower than the apex, which is mod- 

 erately sinuate, with broadly rounded angles; anterior impression very 

 faint, angulate, the posterior obsolete; inner fovea linear, rather fine, 

 widely separated from the base, the surface thence laterally flat and feebly 

 punctulate to a short fine carina near the sides; elytra three-fourths 

 longer than wide and two-fifths wider than the prothorax, parallel, with 

 evenly arcuate sides; striae finely, feebly punctate, impressed internally, 

 very feeble externally, the scutellar very short; dorsal punctures fine, 

 four or five in number. Length (cf 9 ) 5-5-5-8 mm.; width 1.8-2.1 mm. 

 Alaska (St. Paul Island). 



In the female the elytra are broader and more strongly arcuate 

 at the sides than in the male described above, but they are simi- 

 larly parallel and symmetrical. 



Cryobius breviusculus n. sp. Relatively shorter and broader than 

 any of the preceding, shining and piceous, more rufous beneath, the ab- 

 domen black; legs rufous throughout; head well developed, triangular, 

 with rather large but only moderately prominent eyes, the sulci parallel; 

 antennas thick, bright testaceous, gradually infuscate beyond the middle; 

 palpi ferruginous throughout; prothorax two-fifths wider than long, 

 widest at anterior third, where the sides are evenly rounded to the apex, 

 gradually less arcuate and oblique posteriorly and becoming gradually 

 broadly sinuate near the sharp right angles; base not margined laterally, 

 slightly less broad than the broadly sinuate apex, the apical angles not 

 very broadly rounded; transverse impressions both distinct though shal- 



