50 MEMOIRS ON THE COLEOPTERA 



4 Elytral punctures fine. Body oblong-suboval, distinctly depressed, 

 bright blue-black in lustre throughout above, the under surface and 

 legs black; head fully three-fourths as wide as the prothorax, with 

 moderate and widely separated sulci; antennae black, moderately 

 slender, three-fourths as long as the elytra, the medial joints be- 

 tween two and three times as long as wide; prothorax one-half wider 

 than long, widest and laterally rather strongly rounded well before 

 the middle, the oblique sides in basal half nearly straight, faintly 

 sinuate near the angles, which are rather obtuse but not rounded; 

 surface smooth, the subbasal impression obsolete medially, the foveae 

 rather broadly impressed but deep and obliquely linear, near outer 

 fifth; carina short and feeble; elytra evidently less than one-half 

 longer than wide, nearly one-half wider than the prothorax, parallel, 

 obtusely rounded in less than apical third; striae barely at all im- 

 pressed, with nearly flat intervals, the small but deep punctures well 

 separated, especially in the female, becoming obsolete near apical 

 fourth, the striae however faintly subentire; foveae near two-fifths 

 and apical fourth, the anterior wholly wanting, however, on both 

 elytra of the male type, distinct in the female. Length (d 71 9 ) 3-7 

 3.9 mm.; width 1.4-1.5 mm. California (Truckee). Two exam- 

 ples callidum n. sp. 



Elytral punctures coarser and deeper, nearly as in quadndum 5 



5- Form oblong-suboval, moderately convex, polished, greenish-black 

 above; under surface deep, the legs slightly less deep, black; head 

 three-fourths as wide as the prothorax and nearly as wide as an 

 elytron; surface nearly as in callidum; antennae black, almost as 

 long as the elytra, the medial joints between two and three times as 

 long as wide; prothorax slightly more than one-half wider than long, 

 widest near apical third; sides evenly rounded and inflated ante- 

 riorly, oblique and broadly, feebly sinuate behind, the angles slightly 

 obtuse but very sharp; surface with strong biabbreviated stria, dis- 

 tinct posterior impression, obsolescent at the middle, and well re- 

 flexed margins; foveae deep, slightly rugose and linear, at lateral 

 fifth, the carina long but fine; elytra oblong, parallel, broadly para- 

 bolic in apical third, not quite one-half longer than wide and barely 

 two-fifths wider than the prothorax; striae somewhat impressed, fine 

 and partially abbreviated behind, the punctures strong, moderately 

 coarse, well separated, smaller and closer in the sutural series, the 

 punctures gradually becoming obsolete at about apical third and 

 before the hind foveae, the foveae at two-fifths and three-fourths. 

 Length ( 9) 3.84.2 mm.; width 1.351.4 mm. Colorado (Boulder 

 Co., and also one taken by Prof. Snow) tritum n. sp. 



Form more slender, similarly deep black and polished, the legs black; 

 head somewhat more than three-fourths as wide as the prothorax, 

 the black antennae nearly similar but evidently not as long as the 

 elytra, though with the medial joints nearly three times as long as 

 wide; palpi black as in the other species of this section; prothorax 

 much less transverse, less inflated anteriorly, two-fifths wider than 

 long, the sides broadly and moderately arcuate, not so oblique poste- 

 riorly and becoming faintly sinuate near the angles, which are more 



