REVISION OF LISTROCHELUS SAYLOR 93 



(Knaiis) [U.S.N.M.]. New Mexico: Jemez Springs, Galiena Creek, 

 8,500 feet, July 24 [Saylor]. 



Remarks. — Can be readilj^ confused only with L. fimbjipes, L. 

 koehleriana, and more especially L. tarsalis, but is the only one of this 

 group having densely pruinose thorax covered with long hair, and 

 may thus be separated readily in both sexes. 



PHYLLOPHAGA (USTROCHELUS) TARSALIS (Schaeffer) 



Figures 2, a; 3, m; 4, d; 9, g-j 



Listrochelus tarsalis Schaeffeh, Ent. News, vol. 19, p. 319, 1908. 



Male. — Small, elongate, very deeply pruinose above; hairy above 

 except for the glabrous and impunctate thoracic disk. Head very 

 coarsely, rugosely, and contiguously punctate, with moderately long 

 erect hair; the punctures of clypeus a little less dense at sides of apex; 

 transverse carina strongly indicated, inpunctate behind; apex of 

 clypeus slightly rounded, slightly reflexed, angles broadly rounded. 

 Antenna unicolorous, 10-seginented, club over a fourth longer than 

 the funicle. Pro thoracic disk apparently without punctures except 

 for a very few just inside the center of both the apical and basal 

 margins; all margins ciliate; the lateral margins with very long hair 

 and coarsely crenate m apical half, and finely serrate or straight in 

 basal half; hind angles very broadly rounded, just barely indicated. 

 Elytra finely punctate, with long, erect, and moderately dense hairs; 

 striae except for the weak sutural costae not indicated. Pygidium 

 moderately convex, polished, finely and densely punctate, with short 

 suberect hairs; disk declivous before apex, the latter truncate and 

 ciliate. Abdomen highly polished except for lateral pruinose patches; 

 center of disk somewhat depressed and flattened, segments 3 and 4 

 somewhat transversely elevated at centers; fifth segment with faint 

 longitudinal sulcus; sixth flattened, impunctate immediately at the 

 center. Hind tibia with very long and extremely dense hairs on the 

 apical two-thirds of the inner surface. Hind tarsus with first segment 

 over half as wide at apex as long, and with a strong wing-shaped pro- 

 jection in apical two-thirds (see figures). Front tarsus with a strong, 

 sharp, triangular spine at inner apex of first tarsal segment, the spine 

 of the second segment hardly noticeable. All claws weakly serrate 

 along a single margin; without larger intermixed teeth. Hind tarsal 

 segments moderately densely pilose, the hairs long and fine. 



Female. — Antennae rufocastaneous, the club testaceous and as long 

 as segments 3-7 of the funicle combined. Pygidium flattened, faintly 

 tumid near apex; surface finely, densely punctate, with short erect 

 pile; basal half of disk pruinose, apex shining and sub truncate. 

 Abdomen more convex than in the male and the transverse elevations 



