114 PROCEEDINGS OF THE NATIONAL MUSEUM vol.89 



distinctly though finely serrate, but they appear to be almost smooth 

 in some worn specimens. The Mexican L. mimicana Saylor is with 

 difficulty separated from this species externally, but the genitalia of 

 the males are not only of radically different form but are nearly four 

 times as large in the Mexican species as in ours. Also, L. snowi 

 Saylor, described herein from Arizona, is rather close to L. timida but 

 has different genitalia. The present species is conmaonly attracted 

 to light. 



PHYLLOPHAGA (LISTROCHELUS) SNOWI. new speciea 



Figure 3, d-f 



Male. — Small, shining, elongate; thorax rufous, otherwise testaceous 

 to rufotestaceous; apparently glabrous above except for minute, 

 scarcely perceptible elytral hairs. Head very coarsely, densely, and 

 contiguously punctate; transverse ridge of vertex moderately strong, 

 surface behind coarsely and entirely punctate; clypeal apex slightly 

 ^marginate, somewhat reflexed, angles very broadly rounded. An- 

 tennal club ovate, testaceous, and subequal to funicle. Thorax 

 evenly convex, with coarse and dense punctures, and a row of im- 

 pressed punctures just posterior to the apical margin; lateral margins 

 entire, nonciliate, the angles broadly rounded and not explanate. 

 Elytral striae, except sutural, obsolete. Pygidium convex, shining, 

 with coarse and moderately dense punctures. Abdomen flattened, 

 polished, the sixth segment impunctate at base, with coarse setigerous 

 punctures along the apical margin. All claws with slight but distinct 

 pectinations along a single margin, without intercalated teeth. 



Female. — Unknown. 



Length. — 10 mm. Width. — 5.5 mm. 



Type. — The unique male type is from Congress, Ariz., collected by 

 F. H. Snow in July, and is deposited in the collection of the Kansas 

 Museum, from whence it was lent for study through Messrs. Sanderson 

 and Benedict. 



Remarks. — While superficially close to L. timida, the present species 

 is easily distinguished through the characters of the male genitalia 

 and the much more obvious claw pectination, the latter being at 

 most minutely serrate in L. timida. It is interesting to speculate on 

 the possibility that L. snowi has evolved from the L. timida type, 

 since the apical portions of the male genitalia of the former appear 

 to be merely an outfolding and flattening of the L. timida type; 

 since the genitalia of each species are quite rigid, there is but little 

 or no chance that the L. snowi genitalia are merely a deformed speci- 

 men of L. timida, and moreover, the two species are separated by 

 external characters also. 



