146 AMERICAN COLEOPTERA. 



CHRYSOMELID^E. 

 SYNETOCEPHALUS new genus. 



Elongate, parallel, glabrous above, sparsely pubescent 

 beneath. Head large, a little wider than the prothorax, eyes 

 broadly oval, moderately prominent, front not carinate be- 

 tween the antennas. Antennae long, filiform, fully three- 

 fourths the length of the body, joints 2 and 3 equal and 

 together scarcely as long as 4. Labrum transverse, trun- 

 cate ; last joint of maxillary palpi conical, acute, about twice 

 as long as wide, shorter than the preceding joint, which is 

 distinctly elongate. Prothorax transverse, narrowed behind, 

 very narrowly margined at sides. Elytra elongate oblong, 

 epipleurae oblique, extending nearly to the apex. Anterior 

 coxal cavities open behind, coxae separated by a very thin 

 lamina ; middle coxae more evidently separated. Legs slen- 

 der, tibiae straight, all armed at tip with a slender spur ; basal 

 joint of hind tarsus a little longer than the next two united, 

 claws with a strong basal tooth. 



The above characters are in the main those of Luperodes, 

 near which the genus must take its place. The peculiar 

 species upon which it is based does not, however, at all 

 resemble Luperodes. The head somewhat strikingly sug- 

 gests that of a Syneta, but it is relatively larger, with larger 

 eyes. The non-carinate front, more slender antennae, and 

 the coarser and denser sculpture are notable divergencies 

 from Luperodes, and taken with the cephalic peculiarity are 

 sufficient for generic isolation. 



S. autiimnalis n. sp. 



Elongate, parallel, testaceous, occiput, basal margin of elytra, epi- 

 pleura and episterna suffused with reddish, tip of last antennal joint 

 blackish ; upper surface densely rather coarsely subrugosely punctate. 

 Head large, front feebly convex and nearly smooth between the an- 

 tennae ; frontal tubercles flat, limited behind by impressed lines, vertex 

 and occiput densely punctate. Antennas very slender, first joint as 

 long as the next two, second and third subequal, together not quite as 

 long as the fourth, fourth to eleventh subequal, nearly linear, each 

 about five times as long as wide. Prothorax not quite as wide as the 

 head, one-half wider than long, widest at apical third, or two-fifths, 

 base broadly arcuate, scarcely as wide as apex, the latter squarely 



