LeConto.] ANTHONOMINI. 193 



Tribe IX. A v i IIONOMI \i 



This tribe is represented by a large number of species of small size, and 

 constituting but few genera. 



They may be distinguished by the following assemblage of characters : 

 Mandibles normal in form, gular peduncle long, menturn and ligula 

 small. Beak long, slender, cylindrical; antennal grooves extending to the 

 lower edge of the eyes, which are small, convex, rounded and distant from 

 the prothorax, widely separated above, except in Orchestes, and a few 

 species of Anthonomus. Antennae inserted far from the tip of the beak, 

 slender, scape long, funicle 6- or 7 -jointed; club elongate -oval, pointed, 

 entirely pubescent, and sensitive, very distinctly annulated, sometimes 

 almost articulated, or divided into separate joints. Prothorax without 

 postocular lobes, prosternum very short, not emarginate in front, coxae 

 contiguous, prominent. Mesosternum separating moderately the coxae; 

 side pieces diagonally divided. Metasternum moderately long, side pieces 

 narrow, ventral segments separated by deep straight sutures, usually 

 nearly equal ; third and fourth segments short in Alyca; legs rather 

 long ; thighs frequently clavate and toothed; front and middle tibiae 

 with terminal hooks; hind tibiae mucronate at tip, articular surface apical, 

 and not lateral. Tarsi spongy beneath, third joint broad, bilobed, claws 

 cleft, toothed, or appendiculate. The elytra are separately rounded at 

 tip, so as to expose a portion of the pygidium in most of the species, but 

 conjointly rounded in Macrorhoptus and Alyca; this exposure of the pygi- 

 dium is however so slight in some species that it is evidently a character of 

 no importance. 



Pygidium more or less exposed; claws toothed 2. 



" entirely covered 4. 



2. " and last ventral of $ normal 3. 



" of (^ perpendicular, last ventral 



short, emarginate COCCOTORUS. 



3. Eyes rounded distant, hind thighs normal ANTHONOMUS. 



" approximate above, hind thighs thick- 

 ened ORCHESTES. 



4. Ventral segments nearly equal; claws toothed. MACRORHOPTUS. 



" " very unequal; claws appen- 

 diculate ALYCA. 



COCCOTORUS Lee. 



This genus is established upon a species, remarkable as well for its 

 habits as for the singular sexual characters of the tf. In this sex, namely, 

 the additional dorsal segment is large and perpendicular, or rather slightly 

 inflexed, and the last ventral is broadly emarginate behind, so that at the 

 middle it is shorter than the fourth segment. The elytra are more oblong 

 than in Anthonomus, finely and densely pubescent, the striae fine and the 

 interspaces flat ; at the base are two small tufts of hair on each side, and 



PROC. AMER. PHILOS. SOC. XV. 96. Y 



