384 Trans. Acad. Sci. of St. Louis. 



surface less sparsely and dlsUnctly; prothorax elongate, narrower than 

 the head, of the usual form, with the sides nearly straight and dis- 

 tinctly converging posteriorly throughout; elytra longer than wide, not 

 quite as long as the prothorax bat distinctly wider, and, behind, fully 

 as wide as the head, the sides diverging from the base; punctures 

 small and very sparsely scattered throughout, with very indistinct 

 linear arrangement near the smooth polished upper part of the fliuks; 

 abdomen parallel, narrower than the elytra, distinctly, sparsely punc- 

 tate, with a smooth median line. Length 6.7 mm.; width 0.9 mm. 

 West Virginia, — A. D. Hopkins elegantnlas n. sp. 



The punctures of the proiiotum are notably fine, feeble, 

 very sparse and inconspicuous throughout the genus Nudo- 

 biiis and are arranged in the usual two discal series, each 

 containing some 5-7 punctures and an arcuate submarginal 

 line, at each side, of nearly the same number; there are, in 

 addition, some isolated punctures near the apical and antero- 

 lateral margins. The sexual characters are very feeble, the 

 male having the sixth ventral arcuato-truncate at tip, the 

 female having the latter more strongly and evenly, though 

 still broadly, rounded. There are but few striking divergen- 

 cies of structure and the species are remarkably homogen- 

 eous thioughout, though luridipennis and elegantuhis are 

 unusually distinct because of the peculiar form and punctua- 

 tion of the head. 



Xantholiniis Serv. 



The European species of this genus are numerous and 

 include some of the largest palaearctic members of the tribe, 

 but in America I have been unable to find more than one, 

 and this a rather small and aberrant form, widely distributed 

 over the Pacific coast regions. The body is larger and 

 stouter than in Gyrohyp^ius, with a much larger head, hav- 

 insr the gular sutures united from well before the middle, 

 forming a coarse deep groove to the base. In typical 

 species, such as glabratus and relucens, the pronotal punc- 

 tures are rather coarsely impressed, few in number and dis- 

 posed in two dorsal series of about five and a sublateral 

 series at each side of 5-6, with a few between the latter 

 and the edge and some smaller punctures near the apical 

 angles; in such forms as rufipennis Er., the series are placed 



