318 COLEOPTERA OF NORTH AMERICA. 



The scutellum is obtusely triangular in some species of Cyl- 

 lene, rounded in the other genera; the mesonotum is punctured, 

 and hairy at the sides, and has a large undivided, very finely 

 striate stridulating surface. 



The genera are numerous, and indicate three groups; the 

 affinities are in various directions, to Megaderus, Callidium, and 

 by a gradual transition in Euderces, etc., towards certain Lamiides. 

 Nearly all the species of this group are varied with bands of 

 yellow, white, and black pubescence, and the sculpture is always 

 of fine punctures; in some species small elevations on the pro- 

 thorax are intermixed with the punctures. 



Groups may be defined as follows : — 



Epimera of metathorax produced over the angles of the 1st ventral seg- 

 ment, so as to inclose the hind coxae externally ; episterna of meta- 

 thorax usually wide; 

 Front short, intercoxal process rounded. Cyllenes. 



Front large, intercoxal process acute. Clyti. 



Epimera of metathorax not produced, episterna linear; front large ; inter- 

 coxal process of abdomen acute. Anaglypti. 



Group I. — Cyllenes. 



The head is comparatively small, the front short and oblique, 

 the antennae in Cyllene better developed than in the other genera, 

 and longer than the body in % , nearly as long in 9 ; in some of 

 the species of that genus they are thicker at the base, as in many 

 Callidia. The body is rather stouter and less convex than in 

 the other groups ; the presternum is sometimes very broad, 

 and the mesosternum gibbous, or perpendicularly declivous in 

 front ; the episterna of the metathorax are wide, and the epimera 

 prolonged over the side angles of the 1st ventral segment, the 

 intercoxal process of which is rounded in front. The legs are 

 moderate, and not very unequal in length, scarcely clubbed, not 

 spinose at tip. The affinities are partly with Megaderus, and 

 partly with Callidium ; the scutellum is usually rounded behind, 

 but is quite distinctly triangular in some species of Cyllene. 



The genera may be tabulated as follows : — 



Pronotum transversely excavated at the sides, near the base, prosternum 

 perpendicular at tip, mesosternum usually perpendicular in front. 



Cyllene. 



Mesosternum oblique or nearly flat, prosternum declivous at tip, not per- 

 pendicular, pronotum not excavated at the sides, but only rounded, 

 and constricted at base ; 



