REVISION OF LISTROCHELUS — SAYLOR 113 



PHYLLOPHAGA (USTROCHELUS) TIMIDA (Horn) 



Figure 3, a-c 

 Listrochelus iimidus'HoB.N, Trans. Amer. Ent. Soc, vol. 7, p. 146, 1878. 



Male. — Small, apparently glabrous above; color rufous to rufotesta- 

 ceous, the elytra sometimes nearly testaceous. Front of head entirely 

 covered with gross, contiguous, variolate punctures; transverse ridge 

 of vertex not prominent, the surface immediatel}^ behind the ridge 

 densely punctured, the pimctures much smaller and more transverse 

 than those of the front, and udth dense, minute, subprocumbent hair; 

 clypeus punctured nearly as coarselj^ as front but much less densely 

 so, the pimctures not contiguous; clypeal apex narrowly, not deeply 

 emarginate, angles broadly rounded and m.oderately reflexed; eyes 

 rather large. Antenna 10-segmented, club subovate and nearly equal 

 to funicle in length. Thorax with coarse, m^oderately dense punctures, 

 the latter much closer along the apical margin and most sparse at the 

 center of the disk; lateral margins entire, noncUiate, the angles ob- 

 tusely angulate, front angles often slightly explanate; base and apex 

 with strong, complete marginal lines. Elytra coarsely, not densely 

 punctate, the oblique striae moderately prominent ; many of the punc- 

 tures, especially near and at the apex, with minute, hardly evident 

 hairs. Pygidium subopaque, slightly convex, sparsely and coarsely 

 punctured, with short procumbent hairs, apex subrounded. Abdomen 

 flattened at middle, sparsely and finely punctate, shining; fifth seg- 

 ment one-half as long as fourth and plane except for a row of coarse 

 setigerous punctures along the apical margin. All claws finely serrate 

 to nearly plane and smooth, without any larger intercalated teeth. 

 Front tarsus without projections at the inner apex of each segment. 



Female. — Antennal club equal to segments 3-7 combined, abdomen 

 slightly convex, polished, fifth segment and apex of the sixth coarsely 

 but sparsely punctate; all claws with a strong tooth slightly beyond 

 the middle, the surface between the tooth and the claw base minutely 

 serrate. Otherwise similar to the male. 



Length.— 8-11 mm. Width. — 3.5-5 mm. 



Type. — In the Horn collection in Philadelphia. 



Type locality. — "Arizona." 



Specimens examined. — Males, 116; females, 47. Arizona: Santa 

 Catalina Mountains, Gila Bend, Tucson, Canyon Lake, Liberty, and 

 base of Pinal Mountains, taken from April to late in September. 



Remarks. — A common little species and one of the few in the genus 

 in which the area of the vertex behind the transverse ridge of the 

 front is densely, coarsely, and almost completely punctured; in most 

 species this area is either entirely smooth or but sparsely punctate, 

 and then only at the sides. The tarsal claws in fresh specimens are 



