AMEPaCAN COLEOPTERA. 199 



feebly declivous in front, the declivity not limited posteriorly by a 

 raised line; side pieces wide. Ventral segments not very unequal, 

 the first, second and fifth longer than the third and fourth ; sutures 

 straight. Legs moderate, tarsi rather stout and about two thirds as 

 long as the tibiae as a rule ; very slender and subequal to the tibia? 

 in gracilipes ; first joint equal to the two or three following. 



Our species are divisible into two well defined sections, one of 

 more oval form, with small eyes and generally more strongly serrate 

 antenna? ; the other more cylindrical, with large eyes and less strongly 

 serrate antenna?. Nine species are known to me, separable as fol- 

 lows. The puberulus of Boheman is not included ; I am unable to 

 recognize it from the description and it is quite likely not a member 

 of our fauna, notwithstanding the alleged locality, San Francisco. 



Eyes larger and more convex, evidently larger in the male; width of the front 

 from one and one-half to three and one-half times that of the eye as 

 seen from the front; form of body more cylindrical. 

 Posterior raised margin of metasternal intercoxal process distinctly angulate. 

 Front ( % ) fully three times as wide as the eye, pubescence fine and sparse, 



size large (5-7.5 mm.) 1. distans. 



Front {% ) about one and one-half times as wide as the eye, size small (2.5-3 



mm.) 2. pallidus. 



Front ( % ) twice as wide as the eye; pubescence dense, size moderate (3.5-6 



mm.) 3. mucoreuM. 



Posterior raised margin of metasternal intercoxal process broadly arcuate. 

 Less robust, prothorax more parallel, the side margins very narrow and not 

 at all reflexed ; eyes of male relatively larger, the front scarcely more 

 than twice as wide as the eye ; third antenual joint ( % ) about one-half 

 longer than wide; last joint of maxillary palpus elongate, feebly tri- 

 angular 4. peltatus. 



Stouter, prothorax less parallel, the side margins narrowly but evidently 

 reflexed ; eyes of male relatively smaller, the front about two and 

 one-half times the width of the eye ; third antennal joint ( % ) scarcely 

 longer than wide; last joint of maxillary palpus broadly triangular. 



5. harrisii. 

 Eyes small, not very convex, scarcely perceptibly larger in the male, width of 

 the front five or six times that of the eye as seen from the front; form 

 of body more oval. 

 Tarsi normally stout, the fifth joint but little longer than wide ; terminal joints 

 of palpi compressed, triangular or elongate-securiform. 

 Antennae acutely serrate, first two ventrals ( % ) without line of erect hairs. 

 Head not at all strigose, sides of prothorax flattened, pubescence finer and 



sparser 6. fucatus. 



Head substrigose, sides of prothorax not flattened, pubescence rather dense 

 and conspicuous 7. |>ubesc«*ns. 



TRANS. AM. ENT. SOC. XXXI. JUNE, 1905. 



