250 MEMOIRS ON THE COLEOPTERA 



basal angles, which are sharply defined but not or only extremely 

 minutely prominent; base more arcuate than in the preceding and 

 equal in width to the apex; surface similar, except that the basal 

 punctures are sparser and more limited to feebly impressed foveae, 

 not extending to the sides as in rivalis; elytra similar throughout but 

 a little more elongate, the intervals suturally somewhat more convex; 

 hind tarsi a little longer. Length (9 ) 3-25-3.3 mm.; width 1.2 mm. 

 Island of Guadalupe, off the coast of Lower California. Two ex- 

 amples socors n. sp. 



14 L T pper surface polished throughout (cf), the elytra densely micro- 

 reticulate and alutaceous (9). Body piceous-black in color, the 

 elytral humeri and fine sutural stripe faintly rufescent; prothorax 

 above and beneath sometimes faintly but uniformly pallescent; 

 legs dark testaceous; head nearly three-fourths as wide as the pro- 

 thorax, with large but only moderately convex eyes and slender 

 fuscous, basally paler antennae; prothorax relatively rather small, 

 barely a fourth wider than long, the sides subevenly rounded, more 

 converging and straighter basally, the angles very obtuse and some- 

 what blunt, though not broadly rounded; base slightly narrower than 

 the apex; surface smooth, the stria distinct, subentire, the latero- 

 basal area feebly impressed, closely, moderately strongly punctate; 

 elytra rather more than one-half longer than wide and about one- 

 half wider than the prothorax, parallel, with only very feebly arcuate 

 sides and circularly rounded apex; striae fine, with nearly flat inter- 

 vals (9), or deeper, with strongly convex intervals suturally (cf), 

 the discal puncture at three-fifths (cf ) or apical third ( 9 ) ; hind tarsi 

 rather short but slender. Length (c? 9 ) 3.7-4.3 mm.; width 1.2- 

 1.45 mm. California (Siskiyou Co.), Koebele. Eight examples. 



alutaceus n. sp. 



Upper surface polished throughout and equally so in both sexes 15 



15 Upper surface intense and uniform black throughout, even the elytral 

 suture devoid of any distinct evidence of paleness. Form rather 

 slender, polished throughout, the under surface black: legs testaceous; 

 head notably small, although nearly two-thirds as wide as the pro- 

 thorax, the eyes very moderate and less prominent than usual; 

 antennae only moderately slender, almost half as long as the body, 

 blackish, the two basal joints pale; prothorax a third wider than 

 long, the converging sides basally broadly arcuate, the angles very 

 obtuse, rather sharply defined but not at all prominent at their 

 apices; base a little narrower than the sinuato-truncate apex; 

 surface, when not perfectly mature, feebly pallescent at the apical 

 and basal margins, smooth, with distinct stria, the latero-basal 

 region broadly flattened or very feebly and vaguely impressed and 

 with rather sparse uneven punctures, extending almost to the sides; 

 elytra one-half longer than wide, not quite one-half wider than the 

 prothorax, more oval than usual, the parallel sides distinctly arcuate; 

 striae fine, very moderately impressed, the intervals feebly convex 

 suturally, flat externally and apically, the discal puncture behind 

 three-fifths; hind tarsi three-fourths as long as the tibiae. Length 



