TENEBRIONID^E 117 



prothorax, the sides rapidly rounding at base and still more so 

 posteriorly, the sides of the basal margin abruptly parallel; surface 

 strongly, evenly convex transversely, finely, strongly, very closely 

 granulate, the outer costa unusually close to the sides, moderate 

 and not abruptly formed, disappearing at the summit of the declivity, 

 the inner costa obsolete though slightly traceable; abdomen rather 

 finely but very strongly, closely asperato-punctate; legs unusually 

 short, very slender. Length ( 9 ) 14.5 mm. ; width 7.2 mm. Eastern 



Washington State corrosus n. sp. 



6 Form rather narrower, more constricted, the hind body more pyri- 

 form, black, dull in lustre; head densely punctate; prothorax obtrape- 

 zoidal, distinctly wider than long, widest at apical third, the apex 

 feebly sinuate, the angles not prominent anteriorly, the sides arcuate 

 in front, oblique behind, the hind angles right, not prominent; 

 surface rather strongly convex, densely and rather roughly punctate, 

 more roughened at the sides and base; elytra oval, broadest behind 

 the middle, one-half longer than wide, the base equal in width to the 

 thoracic base, the humeri oblique; marginal costa extending to apical 

 fourth; surface convex, with a distinct and rather strong costa 

 extending beyond apical third, within this costa a much fainter one, 

 nearly as long and slightly oblique to the suture; surface finely and 

 moderately closely granulate; prosternum coarsely, closely punctate; 

 propleura punctate-granulate; meso- and metasternum granulate; 

 abdomen muricately punctate, more coarsely at the sides; legs 

 muricately punctate and with short hairs. Length 13.0 mm. 

 Oregon. [Asida densicollis Horn] densicollis Horn 



The various species of the third subgeneric group of Pelecyphorus 

 are more strongly differentiated among themselves than in the two 

 others and will prove to be rather numerous. The drawing of 

 densicollis given by Horn (Proc. Cal. Acad., Ser. 2, IV, plate vii), 

 indicates a species widely different in appearance from corrosus, 

 although they are both much more strongly and densely sculptured 

 than the others; they form a peculiar northern section of the group. 

 In his description, Dr. Horn states that the medial costa in actuosus 

 extends to apical third, whereas in the figure it is drawn nearly to 

 the elytral apex. I have a specimen from San Bernardino, Cal., 

 which corresponds very nearly with this figure. 



Gonasida n. gen. 



With a general habitus suggestive of some forms of Euschides, 

 such as angulatus, and with a similar thoracic base, but other char- 

 acters harmonizing more closely wdth Pelecyphorus, such as the 

 small and retractile ligula and form of the prosternum, this genus 

 differs from either of those genera in the remarkable form of the 



