REVISION OF LISTROCHELUS — SAYLOR 103 



PHYLLOPHAGA (USTHOCHELUS) CAVATA (Bates) 



Figure 12, d-/ 



Lislrochelus cavatus Bates, Biologia Centrali-Americana, Coleoptera, vol. 2, pt. 2, 

 p. 170, 1888. 



Male. — Robust-oval, rufotestaceous to rufocastaneous above, 

 strongly shining, glabrous above. Head lacking the transverse 

 carina of vertex; front sparsely, moderately coarsely pimctate; 

 clypeal suture fine, not impressed ; clypeus transverse and somewhat 

 bowl-shaped owing to the moderately reflexed apical margin, surface 

 finely and densely punctured; apex truncate, angles narrowly rounded. 

 Antenna 10-segmented, testaceous, segment 3 the longest of the 

 funicle, club a little shorter than the funicle. Thorax subrugosely, 

 finely, and densely punctate; base and apex \\ath strong marginal lines 

 and both without cilia; sides roundly, arcuately dilated, the entire 

 raargLQ coarsely crenate and ciliate; hind angles very obtusely sub- 

 angulate, nearly roimded, the front angles similar. Elytra finely, 

 densely, and regularly punctate; sutural and first and second striae 

 prominent. Pygidium unusually convex, highly polished, finely, 

 sparsely, and irregularly pimctured, apparently glabrous (minute 

 hairs visible under high power); apex thickened and truncate; apical 

 half of the propygidium very finely and very sparsely punctate. 

 Abdomen highly polished, smooth (and hardly perceptibly punctate) 

 at center; apical half of the fifth and the entire sLxth segments with a 

 fine longitudinal impression at center of each; sixth segment shorter 

 than fifth, finely and sparsely punctate. Tarsal claws pectinate along 

 a single margin, without larger intercalated teeth; first segment of hind 

 tarsi noticeably shorter than the second. First segment of front 

 tarsus with a very small inner spine at apex. Hind tibial spurs long, 

 slender. Front tibia with upper tooth weakly indicated and closely 

 adjacent to the large median tooth. 



Female (from Bates's description), — Pygidium plane, polished, 

 very sparsely punctate; apical margin explanate and bidentate. Apex 

 of fifth abdominal segment transversely sulcate, sixth large, convex, 

 grossly punctate, apex with deep fovea and margin widely and pro- 

 foundly sinuate. All claws with a subapical tooth. 



Length. — 11-13 mm. Width. — 6-7 mm. 



Type. — In the British Museum (Natural History). 



Type locality. — "San Antonio de Arriba and Mexico City, in 

 Mexico." Also "Cuidad and Ventanas in Durango, and Real del 

 Alonte in Hidalgo for the variety durangoensis." 



Specimens examined. — Males, 2; females, 0. Mexico: 1 cotype 

 from Cuidad in Durango, lent by the British Museum. New Mexico : 

 Las Vegas, August 11 [Saylorl. 



