AMERICAN COLEOPTERA. 189 



TRYPOPIT1S Redtenbacher. 



The very striking resemblance between the species of this genus 

 and those of Ccelostethus persists throughout almost every detail of 

 structure, form and sculpture. The only character given in the 

 books for their separation is the difference in antennal formation. 

 In Trypopitys these organs are more or less serrate, with the outer 

 joints less suddenly and conspicuously longer. The degree of serra- 

 tion varies somewhat, being more complete in the European carpini 

 than in our species. It seems not to have been observed that the 

 tibial spurs are entirely wanting in Trypopitys, a character elsewhere 

 noted only in Xarifa. European authors place this genus in the 

 Xyletinini on the strength of the serrate antennae. This arrange- 

 ment is a convenient one, but it entirely overestimates the import- 

 ance of the antennal differences, which, it should be observed are 

 nowhere in the Ptinidse of more than generic significance. In every 

 other respect Trypopitys is intimately related to Ccelostethus and 

 must be associated with it. 



Two closely allied species are known in our fauna, one inhabiting 

 the eastern United States, the other the Rocky Mountains and 

 Pacific Coast. They are distinguished as follows : 



Pubescence throughout shorter and subrecumbent 1. sericeus. 



Pubescence longer and more bristling 2. puuctatus. 



1. T. sericeus Say. — Oblong, nearly two and one-half times as long as 

 wide, subcylindric&l, brown; pubescence ochreous, short and recumbent. Head 

 deeply sunk within the prothorax, the eyes nearly or quite covered in repose; 

 front evenly convex, densely granulate. Antenna: less than half as long as the 

 body, the outer joints not wider; first joint elongate, moderately stout; second 

 small, quadrate ; 3-6 triangular, the third nearly as long as wide, the others dis- 

 tinctly transverse ; seventh a little longer and becoming parallel apically ; eighth 

 and ninth progressively longer and more oblong; tenth similar to the ninth, 

 eleventh narrow and more elongate. Prothorax not quite as wide as the elytra, 

 about as long as wide, sides parallel, broadly sinuate at middle, hind angles 

 slightly siuuately retracted, nearly right and sharply defined ; disk evenly con- 

 vex, longitudinally sulcate at middle, the sulcus evanescent anteriorly ; posterior 

 transverse impressions well marked, but less deeper than in Ccelostethus ; surface 

 granulate. Elytra with regular series of approximate quadrate punctures ; the 

 intervals a little convex and not much wider than the punctures. Beneath 

 ochreo-pubescent, the hairs somewhat longer than above; presternum not dis- 

 tinctly carinate ; metastcruum closely granulate; abdomen annulate-punctate. 

 Length 4.9-6.2 mm. 



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



