CETONIIN^E 311 



wanting along a narrow subtumid polished median line, the hairs 

 coarse, rather abundant but not very long; scutellum wholly black, 

 unusually slender, rapidly very broadly expanded at base, having 

 incised arcuate lines along the sides; elytra with laterally very 

 prominent humeri, the sinus deep, the sides behind parallel to the 

 broadly rounded angles, the sutural angles obtuse; punctures close 

 and transversely lineiform on the flanks; there are two fine double 

 incised lines in the two intercostal valleys, these pairs of double lines 

 inclosing a line of fine punctures; there are also other small punc- 

 tures scattered between the double sets of lines and near the suture; 

 pygidium moderately pubescent, with the usual concentric lineiform 

 sculpture; teeth of the anterior tibiae unequally spaced as usual. 



Length (cf ) 12.0 mm.; width 6.4 mm. Mexico *retusa n. sp. 



Last joint smaller, slender, but not longer than the first antennal joint. .4 

 4 Three teeth of the anterior tibiae unequally spaced as usual, the two 

 upper the more approximate; mesosternal knob transversely oval; 

 hind tarsi slender. Body smaller and rather more rhomboidal than in 

 the preceding, similar in coloration and maculation, except that the 

 sides of the medially divided pronotal black area are, antero-laterad, 

 more deeply and obliquely penetrated by the pale border, sometimes 

 extending through to the pale median vitta, thus isolating two 

 anterior black spots, and that the black spots of the elytra extend 

 along the second as well as the first ridge as a rule; head and pro- 

 thorax nearly similar in form and sculpture, except that the sides of 

 the latter are not so angulate before the middle but merely more 

 rounded; thoracic base similarly broadly arcuate to feebly truncate 

 medially; scutellum of the usual form, differing from that of retusa in 

 being shorter, less slender posteriorly and less rapidly or markedly 

 expanding basally, covered with scratch-like punctures, except along 

 the middle, black in color, with a large pale spot posteriorly which is 

 wholly wanting in retusa; elytra in form and sculpture nearly similar, 

 rapidly expanded at base because of the laterally very prominent 

 rounded humeri; pygidium similarly pubescent but with the oblique 

 incised interlacing scratches much less close-set. Length (2 cf , 4 9 ) 

 8.4-11.0 mm.; width 5.0-6.0 mm. Texas, Kansas, Colorado and 



New Mexico clarki Lee. 



Three teeth of the anterior tibiae subequally spaced as a unique exception 

 in the group, the uppermost nearly half as high and wide as the 

 second; mesosternal knob more elongate, barely wider than long; 

 hind tarsi not so slender. Body larger and still more rhomboidal, 

 colored, sculptured and maculate as in clarki, the oblique pale tint 

 from the lateral pronotal border isolating two anterior pronotal 

 black spots in the type; head black, pallescent at the margins of 

 the clypeus, strongly, very densely punctate throughout; prothorax 

 sculptured as in clarki, the sides arcuate, becoming subparallel in 

 basal half, the basal margin truncate and rectilinear at the middle, 

 scutellum in form and sculpture nearly similar but pale throughout, 

 except finely at the edges; elytra relatively broader at the humeri, 

 otherwise nearly similar in form and sculpture, less maculate with 

 black, the suture in the type finely infumate, and with a transverse 



