AMERICAN COMPONENTS OF THE TENTYRIIN^ 435 



4 — Elytral series obsolete only slightly behind the middle 5 



Elytral series longer, obsolete only toward apex 14 



5 — Antennae stouter, the tenth joint not or but slightly longer than 



wide 6 



Antennse very slender, the tenth joint very much longer than wide... 13 



6 — Head not at all narrower than the prothorax. Body black, shin- 



ing, the head sparsely punctate, with two supra-orbital folds at 

 each side ; prothorax punctate ; elytra with rather large punctures, 

 obsolete near the middle, arranged in nine series, the intervals 

 and apex impunctate. Length 8.0 mm. California (Colorado 

 Desert) laevis Lee. 



Head evidently narrower than the prothorax in both sexes 7 



7 — Species of the California fauna. Body stout, strongly convex, 



vei'y highly polished, black or with a feeble piceous tinge; head 

 very obviously narrower than the prothorax, the frontal tumidity 

 and the occipital region finely, sparsely punctate, the latter not 

 rugose and unusually convex, with one or two acute plicae near 

 the orbital carinas; antennae stout, moderately long; prothorax 

 large, between a fourth and third wider than long, the sides 

 parallel and broadly rounded in about apical half, strongly con- 

 verging and becoming broadly sinuate toward base, the latter 

 truncate and very heavily beaded, fully four-fifths as wide as the 

 apex, the latter very feebly sinuato-truncate, with the angles some- 

 what advanced and prominent, the punctures more or less fine 

 and sparse, becoming rather coarse and deep but well separated 

 laterally ; elytra elongate-oval, the punctures coarse, arranged in 

 series which are distinctly impressed, becoming obsolete at some 

 distance behind the middle, the intervals with fine but unusually 

 distinct, sparse and confused punctures obsolete toward apex; 

 abdomen impunctate laterally, rather coarsely so toward the mid- 

 dle of the basal segment and distinctly, though finely, on the me- 

 dian parts of the second segment, the sterna and parapleuras very 

 coarsely but not closely punctate. Male with an elongate-oval, 

 spongy-pubescent spot at the centre of the first ventral segment. 

 Length 7.25-8.0 mm. ; width 2. 8-3. 45 mm. California (Kern 

 Co.) politus n. sp. 



Species of the Arizona faunal regions ...8 



8: — Elytra strongly shining throughout 9 



Elytra evidently alutaceous toward tip 12 



9 — Male with the pubescent fovea at the centre of the first ventral 



not impressed, elongate-oval in form 10 



Male with the pubescent fovea strongly impressed, more rounded... 11 



10 — Form rather stout, deep black, polished, glabrous; head finely, 



sparsely punctate posteriorly, sometimes feebly rugulose and with 

 two or three sharp plicai near the carin^e ; prothorax a fourth to 

 nearly a third wider than long, only moderately narrowed toward 



