AMERICAN COLEOPTERA. 



147 



This species is very distinct by its size color, sculpture beneath 

 and general absence of pubescence. The frontal ridge so character- 

 istic of the species of this genus is here completely wanting, and 

 very little is left of Listrochelus excepting the feeble serrulation of 

 the claws. 



One specimen, Arizona. 



I, falsiis Lee. Synopsis Melolonthidse, Journ. Acad. Ser. 2, vol. ii, p. 

 264 loblong oval, pale ferruginous, surface distinctly pruinose and sparsely 

 clothed with very short erect hairs. Head densely and coarsely punctured, 

 front flat, clvpeus transverse, angles broadly rounded, margin moderately 

 reflexed, anteriorly feebly emarginate. Thorax nearly twice as wide as long, 

 slightly narrower in front than at base, sides obtusely subangulate at middle, 

 posteriorlv slightlv sinuate, margin crenulate and fimbriate, disc moderately 

 convex, surface "shining, moderately coarsely but not densely punctured. 

 Elvtra very sparsely punctate, sutural costa feeble, discal costse obsolete. 

 Body beneath moderately densely hairy, abdomen obsoletely sparsely punc- 

 tate. Length .56 inch; 14 mm. 



Male-C\uh of antennae longer than the funicle. Fourth and fifth ventral 

 segments suddenly concave, sixth slightly concave at middle and longitudi- 

 nally impressed. Pygidium convex, sparsely punctate, apex truncate. Claws 

 of anterior tarsi dissimilar, the inner slender and simple, the outer with a 

 very small tooth at middle and an extremely feeble trace of dent.culat.on. 

 Middle claws with a very fine tooth at middle. Posterior claws with a fine 

 tooth at middle but without denticulation. Posterior tibi^ with a few stiflF 

 hairs within, spurs slender, outer slightly longer, tarsi slightly longer than 

 the tibise. Sixth ventral nearly as long as the preceding. 



Female -C\nh of antenna slightly shorter than the funicle. Abdomen 

 convex sparsely punctulate, fifth ventral with a single transverse plica at 

 middle and very little longer than the sixth. Pygidium moderately convex, 

 sparsely punctate and shining, marginal groove moderately deep, apex oval. 

 Claws alike on all the feet, each with a small but quite distinct tooth at middle 

 and without denticulation. Posterior tibial spurs slender, pellucid at tip, the 

 outer somewhat longer, the tarsus about the length of the tibia. 



This species is about the size and form of Lachnosterna tristis. 

 Both sexes have the posterior tibise unicoronate. 

 Occurs in Kansas, Colorado and New Mexico. 



Li. fiinbripes Lee. Synopsis Melolonthidse, Journ. Acad. Ser. 2, vol. ii, 

 p 264 — Subovate, ferruginous, surface distinctly pruinose, sparsely clothed 

 with moderately long erect hairs. Head coarsely and moderately densely 

 punctured, clypeus transverse, angles broadly rounded, margin moderately 

 reflexed, at middle feeblv emarginate. Thorax more than twice as wide as 

 long apex slightly narrower than base, sides obtusely subangulate and slightly 

 sinuate posteriorly, margin senulate in front and fimbriate, basal margin with 

 moderately long erect hairs, disc moderately convex, surface shining, very 

 sparsely and not deeply punctate. Elytra sparsely punctate, smoother near the 

 tip, sutural and one discal costa feebly elevated. Body beneath moderately 

 densely clothed with rather long hairs. Length .48 inchj 12 mm. 



