360 MEMOIRS ON THE COLEOPTERA 



rather small, deep and narrowly separated punctures, the flattened 

 area obliquely impressed at each side within the tumid margins, 

 which continue distinct arcuately across the front at the summit of the 

 steep declivity, the clypeus strongly reflexed, sometimes with trace 

 of a faint median carina; prothorax evidently less than one-half 

 wider than long, rather convex, feebly impressed along the median 

 line, parallel, widest at about the middle, the sides strongly rounded, 

 feebly sinuate just before the basal angles, which are small, tumid and 

 abruptly below the general level; punctures rather coarse, moder- 

 ately deep, well separated, coarser and crowded near the sides; 

 elytra fully one-half longer than wide, only a fourth or fifth wider than 

 the prothorax, feebly convex, with a few evident broad, feebly im- 

 pressed, longitudinal lines, the areolae not impressed, opaque, entire, 

 moderate in size, elongate-oval and well separated, the flanks not 

 very abruptly descending and with small, slightly deeper and dis- 

 tinctly separated punctures; pygidium convex, with widely separated 

 and rather small shallow areolae, generally even but with vestiges 

 of a median carina in one example from Colorado; anterior tibiae 

 with the two teeth large and thick, sometimes with a swelling 

 above the upper tooth, suggesting a feeble and very obtuse third 

 tooth; hind tarsi two-thirds as long as the tibiae, compressed, the 

 second and third joints on the flat side not quite one-half longer than 

 wide. Length 9.8-11.8 mm.; width 4.3-5.2 mm. New Mexico, 

 Kansas (Manhattan), Colorado (Fort Collins), Manitoba (Aweme), 

 .and eastward to Illinois and Wisconsin. Common. [Crem. creni- 



collis Westw.] knochi Lee. 



A Similar but rather smaller, the sparse hairs excessively minute; 

 head similar but with the punctures still finer, becoming sparse 

 toward the well defined summit of the anterior slope, the oblique 

 lateral impressions as in knochi; prothorax nearly similar, except 

 that the punctures are smaller, shallower and sparser; anterior 

 angles similar, smaller than in the other species; elytra similar, 

 except that the areolae are smaller, sparser and tend more nearly 

 to aggregation in three broad lines on each elytron; pygidium very 

 convex, with small sparse areolae; anterior tibiae more slender, 

 without trace of an upper external swelling; hind tarsi longer, 

 three-fourths as long as the tibiae, very slender, the second and 

 third joints on the wider side fully twice as long as wide. Length 

 10.2 mm.; width 4.3 mm. Kansas (Wheeler, Cheyenne Co.). 



One example gracilipes n. subsp. 



B Similar to knochi but shorter, the hind tarsi as in that species, the 

 anterior tibiae nearly similar but without trace of external swelling 

 above the teeth; head similar but with the upper surface broadly 

 impressed in transverse oval, which gradually becomes more im- 

 pressed laterally, the punctures becoming shallow, ill-defined, with 

 scabriculate surface in these large lateral impressions, the summit 

 of the steep declivity more narrowly and sharply tumid than in 

 any other species; prothorax similar but with the punctures very 

 shallow and variolate; elytra much shorter, barely over two-fifths 

 longer than wide, otherwise nearly as in knochi, except that the 



