THE CANADIAN ENTOMOLOGIST 219 



are the same width at the base as the thorax, then widen out to the anterior 

 sixth, then run parallel to the posterior fourth, from which the sides curve to 

 the suture, the apex being sinuate. The intervals are interrupted by shallow 

 transverse wrinkles most deeply incised where the intervals dip to the striae; 

 the striae possess traces of punctures at rare intervals; the seventh stria is almost 

 obsolete. 



Length 13 mm. 



This species is described from a series of six specimens all taken at Edmon- 

 ton. The writer had for comparison a series of ohtiisa Lee, one from Edmonton 

 and three from Mr. Chagnon, Montreal. From obtusa it is easily distinguished 

 by its size and the appearance of the elytra, which somewhat resemble those of 

 Amara interstitialis Dej. 



Chlaenius frostii, new species. 



The type is to be deposited in the National Collection at Ottawa, labeled 

 ll-V-18, Edmonton, Alta.; collected by F. S. Carr; male. 



Length 9 mm. The colour is black beneath, slightly violaceous above, 

 darker on the head and thorax, polished and shining. The antennae are piceous 

 with the first joint pale, the palpi are black with the tip almost white, the terminal 

 joint being dilated and truncate. The labial palpi are more dilated than the 

 maxillary palpi. The head is smooth. The thorax is widest at the base gradu- 

 ally becoming narrower towards the apex, the base of the thorax and the elytra 

 being the same width. The anterior angles are broadly rounded, the posterior 

 obtuse. The impressions are double, wide, shallow and punctured coarsely, 

 the punctures being separated by their own diameter. The median impression 

 is defined as a narrow impressed line fading out anteriorly and posteriorly and 

 bordered on each side b\^ a row of punctures. The remainder of the surface 

 is sparsely punctured with the exception of the base, which is punctured like 

 the impressions. 



The basal line of the elytra meets the lateral line at an angle. The striae 

 are clearly impressed and punctured and are wide apart, the intervals being 

 flat and shining. The punctures of the intervals are coarse, being about 3'/2 

 punctures to the greatest width of a;ny interval, and occurring in lines arranged 

 more or less transversely. The punctures on the first interval are at most in 

 two rows. The scutellar stria is short and deeply impressed. The abdomen 

 is coarsely, shallowdy and sparsely punctate and sparsely pubescent with short, 

 yellow pubescence. The prosternum is coarsely and sparsely punctate; the 

 mesosternal episternum and the metasternum are cribrate. 



The describer has given this species the name frostii as an indication that 

 he appreciates the great amount of assistance given him by Mr. C. A. Frost. 

 In connection with this species Mr. Frost kindly loaned a specimen of pur- 

 puricolUs Rand, that had been compared with the material in the Leconte and 

 Harris collections. 



This species is most closely related to purpuricolUs. It is most readily 

 distinguished by the following table: 



frostii  purpuricolUs 



elytra shining , elytra opaque from small, transverse lines, 



punctures coarse punctures small 



