NORTH AMERICAN COLEOPTERA. 281 



Group XV, quercus. 

 This gi'oup contains a few species in which the form is decidedly 

 cylindrical and the antennae 9-jointed ; the clypeus is entire in three 

 species and eniarginate in two, the margin in all rather widely re- 

 flexed ; the last joint of the maxillary palpi is fusiform, and at most 

 with a slight flattening on the outer side ; the breast is feebly hairy 

 in all except ecostata, which is further remarkable in having the hind 

 angles of the thorax rounded and the elytra without costse ; the an- 

 terior tibia? are tridentate in the usual manner ; the spurs of the 

 male hind ti bite are free and slender; the claws have in three species 

 a small basal tooth, but in quercus the tooth is large and median ; 

 two species are more or less iridescent, the others glabrous. The head 

 is rather broad, with prominent eyes in three species, small in ecostata. 

 The species adopted as the typical form of the group was made 

 the type of Endrosa by Dr. LeConte. I have given, in sufficient 

 detail elsewhere, the reasons for rejecting the genus, and find, since 

 the discovery of allied species, that it must take its place in this por- 

 tion of the older genus Lachnosterna. 



The following species are at present known : 

 Hind angles of thorax distinct ; sutural costa of elytra always present. 

 Clypeus more or less emarginate. 



Surface subopaque or iridescent; tooth of claws large and median. 



69. quercus. 

 Surface shining. 



Tooth of claws large and median; inner sjjur of hind tibise long and 



slender 70. iuci*!:!. 



Tooth of claws small and basal ; inner spur of hind tibia' short. 



71. afl'abiliM. 

 Clypeus entire; surface glabrous; tooth of claws small and nearly median. 



Head not broad, thora.x distinctly narrowed in front; color rufotesta- 



ceous ....: 72. cl.ypoata. 



Head broad, eyes large, thorax scarcely narrower at apex than al base: 



color dark brown or piceous 73. bo<»|>»». 



Hind angles of thorax rounded ; elytra without trace of costie ; pectus with long 

 hair. 

 Clypeus entire; surface subopaque; tooth of claws small and ba.sal. 



74. ecostalsi. 

 Both sexes are known of quercus, clypeata and hoops, males only 

 are known of the others. 



69. li. quercus Knoch.— Oblong, cylindrical, rufotestaceous, head darker, 

 elytra paler, surface glabrous, i)ruinose. Clypeus enuirginate. margin narrowly 

 reflexed, punctures moderate, not clo.sely placed, front more coarsely i.unctured. 

 Head broad, eyes large. Thorax rather short, very little narrowed in front, sides 

 arcuate, not crenate, distantly ciliate, punctures moderate in size, very regularly 



TRANS. AMER. ENT. SOC. XIV. (36) DECEMBER, 1887. 



