26 PROCEEDINGS OF THE NATIONAL MUSEUM vol.82 



median, and siibmarginal vittae, metasternum in part, apex of tibiae, 

 and tarsi dark. Head with interocular space slightly more than 

 half its width; tubercles distinctly marked, carina not acute, broad, 

 and slightly produced; coarse punctures about fovea on each side 

 of head near eye, but median space usually smooth; pale with la- 

 brum, usually tubercles, and occiput darker. Antennae robust, 

 dark with paler basal joints, third joint shorter than fourth or fifth, 

 which are subequal, the fourth longer. Prothorax not twice as wide 

 as long, narrowed very little anteriorly with only slightly arcuate 

 sides ; not very convex ; a slight callosity on either side on basal half 

 and a median basal depression; surface alutaceous and finely punc- 

 tate; pale with five spots, sometimes lateral sjDots and median stripe 

 evanescent. Scutellum dark. Elytra with parallel sides, somewhat 

 convex, humeri well developed and an intrahumeral sulcus; on lat- 

 eral apical half a trace of the ridges characteristic of the pensylvan- 

 ica group, and slightly more developed than in alternata\ surface 

 alutaceous and finely punctate; vittae usually wider than in alter- 

 nata except in the southwestern specimens, and the sutural and sub- 

 marginal often rather feebly joined at apex. Body beneath densely 

 and somewhat coarsely pubescent, pale with metasternum in part, 

 usually the middle, dark; apex of tibiae and tarsi dark. Length, 

 6.8 to 7.8 mm; width, 3.5 to 4.4 mm. 



Type locality. — Kansas (as here restricted). 



Distribution. — Tennessee; Illinois (Elizabeth town. East St. Louis, 

 Grafton, Grand Tower, Kahokia, Metropolis, Peoria, Quincy) ; 

 Kansas (Topeka) ; Missouri; Arkansas (Texarkana) ; Oklahoma 

 (Cleveland County) ; Texas (Brownsville, Columbus, Dallas, Del 

 Rio, Laredo, Wellborn) ; Louisiana (Baton Rouge, Mandeville) ; 

 Colorado (Boulder). 



Food plant. — Salix. 



Remarks. — The specimen labeled pluriligata in the LeConte collec- 

 tion also bears a green label, indicating that it is probably the Kansas 

 specimen mentioned in the original description. It fits the descrip- 

 tion and may be considered the type. In most collections pluriligata 

 is confused with altemata. As LeConte states, pluriligata is "allied 

 to altemata., but narrower and with a less transverse thorax." It is 

 very difficult, however, to distinguish the two species in many in- 

 stances, and the only certain means is to dissect for the aedeagus, 

 that of pluriligata having a broad tip quite different from the acute 

 tip of altemata. In general, pluriligata is more elongate, has a 

 smoother head, the prothorax is narrower, the elytral vittae are 

 wider, and the elytral ridging in the female is more pronounced. Its 

 range, also, is more southern, no specimens being as yet known from 

 Canada, New England, or the Northwestern States. I have seen 



