THE CANADIAN ENTOMOLOGIST. 271 



C. tridens, n. subsp. — Similar to Levettei, except that the elytra are 

 more elongated and more parallel ( $ ) or shorter and more parallel (V), 

 and are either wholly immaculate or with a very small submarginal spot at 

 the middle and a small transverse apical remnant of the larger apical spot 

 of Levettei ; the strigilation of the interocular part of the head is also very 

 evidently coarser. Length, ^ , ? > 12.8 mm.; width, 5.0-5.2 mm. North- 

 western Louisiana (Vowell's Mill), to Kansas (Onaga). 



The labrum in this group is very strongly tridentate, the median tooth 

 especially prolonged and acute. 



The following form would seem to be allied to pundulata, but it 

 differs in so many directions as to leave its exact affinity obscure for the 

 time being : 



C. Boulderensis, n. sp. — Form somewhat as in pundulata but much 

 more elongate, convex, rather dull, dark coppery-brown, slightly more 

 cupreous anteriorly, shining, green-blue and laterally densely pubescent 

 beneath throughout the length; head granulose, strigilate laterally, the 

 front bald, the labrum with the narrow apical truncature minutely 

 unidentate ; prothorax but little wider than long, moderately narrowed 

 basally, broadly rounded at the sides, the marginal line strong ; surface 

 convex, finely, strongly rugulose, punctate and sparsely pubescent laterally, 

 the impressions moderate ; elytra elongate, parallel, not obtuse at tip, the 

 sutural angles denticulate ; surface strongly, rather finely and nitidoasper- 

 ately punctate, the humeral lunule represented by the basal part and a 

 post-humeral dot, the side margin, from just before the middle to apical 

 third, unevenly and narrowly pale, the apical lunule complete but slender; 

 there is also a discal dot at inner and apical third. Length, 9 > l 2 -o mm.; 

 width, 4.0 mm. Colorado (Boulder Co.). 



This species differs from pundulata in having the line of foveae 

 parallel to the suture very small in size and almost obsolete, and in the 

 densely and very conspicuously pubescent sides of the abdomen. 



The form which I described (Ann. N. Y. Acad., IX, p. 296) as a 

 variety of purpurea, under the name p/utonica, is in reality a distinct 

 species, not very closely allied to purpurea, or, in my opinion, to any 

 other species. Recognizing its distinctness from purpurea, Dr. W. Horn 

 states that it may be a variety of tranquebarica ; at any rate, according to 

 that author, it must be a variety of something. The Oregon specimens 

 referred to plutonica by Leng seem to have been correctly determined. 



Denverensis is not a subspecies of purpurea, but an abundantly 

 distinct species, having the labial palpi basally pale, and not wholly black. 



