334 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.37. 



ATTELABUS GENALIS LeConte. 



This species is not represented in the collection. 



ATTELABUS RHOIS Boheman. 



Holderness, New Hampshire, September, on Alnus; Durham, New 

 Hampshire (Weed and Fiske); Lewiston, Maine (Hubbard and 

 Schwarz); Springfield, Massachusetts, July; Lawrence, Massachu- 

 setts; Marion, Massachusetts, July; Halifax, Nova Scotia (Wick- 

 ham); Pennington, Virginia, July; Marquette, Michigan, July (Hub- 

 bard and Schwarz); Bayfield, Wisconsin (Wickham); Southern 

 Illinois, on Corylus americana; Iowa City, Iowa (Wickham); Onaga, 

 Kansas (Crevecoeur) ; Baldwin, Kansas (Baldwin); West Point, 

 Nebraska, June (Bruner); Chiricahua Mountains, Arizona, June 

 (Hubbard and Schwarz). 



SulDfaiTLily TIIE!CESTEI?,:sri]Sr^. 



Genus THECESTERNUS Say. 



This genus has long been left alone because of doubt as to the 

 specific characters available. The majority of specimens in the col- 

 lections are badly rubbed or else matted with dirt. It is not advisable 

 to attempt a determination of rubbed specimens. There are, how- 

 ever, several distinct species in the series of eighty-four specimens 

 which I examined in the National Museum collection. I have some 

 hesitation in describing them, because I realize that possibly one or 

 two may be synonymous with LeConte's species. Valid descriptions 

 are, however, necessary. How many of LeConte's species are good I 

 can not say, although I consider that rectus is a synonym of humeralis, 

 while rudis and erosus are possibly variations of affinis. The four 

 species herein described as new are all from the extreme southwestern 

 semiarid and arid portions of the country. 



KEY TO SPECIES OF THECESTERNUS. 



I. Elytra without clusters of erect black setae; prothorax at widest part as wide as, 



or wider than the elytra at humeri, not strongly narrowed on sides at front, very 

 feebly elevated in front; humeral angles prominent, but never produced. 



Setae white, decumbent; prothorax very coarsely pitted; elytra" coarsely pitted 

 and tuberculate foveolatus, new species. 



Setse brown and white, erect; prothorax coarsely punctured, tuberculate; elytra 

 coarsely pitted and densely tuberculate; antire body bristling with erect 

 seta? hirsutus, new species. 



(Prothorax unequal, less deeply impressed on sides, hardly transversely elevated 

 at apex, elytra not produced at humeri morbillosus LeConte.) 



II. Elytra with clusters of erect black scales; prothorax at widest part rarely as wide 



as the elytra at humeri. 

 Prothorax one-third longer than wide, very gradually narrowed at base and tip, 

 with four dorsal impressions, and strong lateral impression; elytra only moder- 



