146 MEMOIRS ON THE COLEOPTERA 



nearly as in the preceding species. Length (21 cf, 5 9) 9.5-12.5 

 mm.; width 4.7-6.7 mm. Virginia and North Carolina and west- 

 ward to Missouri, Kansas and Mississippi (Vicksburg). [Melohntha 

 immaculata Oliv., Mel. nigrifrons Panz., and Cyclocephala frontalis 

 Sturm] immaculata Oliv. 



Form (cf ) somewhat similar but much stouter, relatively shorter and 

 with still thinner pellucid pale brownish-yellow integuments; head 

 rather less than half as wide as the prothorax, piceous-black, with 

 the deep punctures rather close-set at each side of the front, sparse 

 elsewhere and smaller basally; eyes large, prominent, separated by 

 twice their width; clypeus trapezoidal, with strongly arcuate sides 

 and apex, so that the angles are subobliterated, the apex strongly 

 reflexed; surface closely punctured and subrugose; suture obliterated 

 medially but easily traced by the abrupt difference in sculpture; 

 antennal club as long as the stem or a little longer; prothorax not 

 quite as transverse as in the preceding, the rounded sides becoming 

 more parallel posteriorly, the basal angles less broadly rounded, the 

 punctures similar; scutellum very acute, with a few feeble scattered 

 punctures; elytra but slightly elongate, the rather sparse punctures 

 finer, the geminate series evident, the intermediate surfaces perfectly 

 flat; pygiditim more sparsely and clearly punctate, the erect hairs 

 moderate; hind tarsi long as usual. Female smaller, shorter, with 

 denser and browner integuments: head small, the clypeus nearly 

 similar but shorter, the dense punctures deeper; antennal club but 

 little more than half as long; prothorax about twice as wide as long, 

 the sides more rounded, the sparse punctures sometimes fine and 

 occasionally rather coarse; scutellum more punctured; elytra more 

 inflated posteriorly and with the punctures closer and relatively 

 coarser than in any other form of the genus, sometimes rugulose, the 

 costse more evident; lateral edges at the middle only slightly arcuate 

 and scarcely at all deplanate or thickened; pygidium glabrous; 

 hind tarsi very short as usual in the females of this section, a little 

 longer than the tibiae. Length (cf) 11.2-12.0, (9) 11.3-11.6 mm.; 

 width (cf) 6.2-6.8, (9) 6.0-6.6 mm. Kansas (Douglas Co.). 

 Two males the types; the two females are unlabeled and may not 

 really belong to the species tenuicutis n. sp. 



7 Form (cf) oblong, parallel, moderately convex, shining, generally 

 much darker red-brown than in any of the preceding species, the 

 erect elytral pubescence sparse and easily removed, longer, closer 

 and bristling along the side?; head about half as wide as the prothorax, 

 black, with rather close-set punctures, sparser along the sometimes 

 feebly convex median line, remote basally, the eyes only moderately 

 large, separated by much more than twice their width; clypeus 

 trapezoidal, with rounded sides and rounded reflexed apex, the angles 

 indistinct; surface closely but not coarsely, shallowly punctate and 

 subrugulose, the suture obsolescent except laterally; antennal club 

 curved, much longer than the stem; prothorax almost twice as wide 

 as long, sometimes with intricate nebulous design, in which two 

 narrow median vittae, more separated anteriorly, and some lateral 

 spots, can be discerned, the sides rounded, more converging an- 



