ROLAND IIAYWARD. 35 



19. A. liscinatopa Dej.— Elongate, iDoderately convex. Head and thorax 

 black, in the males inore or less aeneous, the elytra in that sex green or cupreous 

 with strong metallic lustre, in the females usually very feebly metallic or nearly 

 black; surface shining. Head as wide as the thorax at apex; frontal grooves 

 long, deep, extending forward on to the cpistoma ; antenna shorter than tlie 

 head and thorax, thickened, piceous or rufo))iceous; palpi rufous or rufopiceous. 

 Prothorax about one-half wider than long, subquadrate, widest slightly in front 

 of the middle, as wide at base as apex, impunctate at apex, often more or less 

 transversely wrinkled along the median line; apex feebly eniarginate; trans- 

 verse impressions moderate or sometimes feebly impressed ; median line distinct, 

 abbreviated in front; basal impressions broad, deep, rather finely and sparsely, 

 sometimes ol)soletely punctate, distinctly bifoveate ; sides arcuate from apex to 

 base, the margin distinctly reflexed, slightly more widely toward the base; base 

 truncate; hind angles obtuse, not prominent, cariiiate. p]lytra together slightly 

 wider than the thorax and more tljan one-half longer than wide, subparallel, 

 slightly flattened on the disk, moderately deeply striate; humeri rounded ; strife 

 entire, usually obsoletely punctate, rarely distinctly so, the scutellar stria mod- 

 erate, the eighth with the row of ocellate punctures broadly interrupted at mid- 

 dle; intervals slightly convex. Body beneath black or dark piceous, rarely 

 feebly feneous in very highly colored specimens, impunctate, except the meso- 

 sternal episterna which are finely and sparsely punctured. Legs varying from 

 rufous to rufopiceous; middle and hind femora with two setigerous punctures 

 along the inner margin ; basal joint of the hind tarsi slightly grooved externally. 

 Length .40-.52 inch ; 10-13 mm. 



In the males tlie middle tibite are only feebly bisiiiuate on the 

 inner side near the apex. 



The females are larger, more robust and less shining than tlie 

 males, and with at most l)ut feeble metallic lustre. 



The name Jurmatopa Dej. has priority over that of simili'i Kirbv, 

 by which the species has been generally known. 



Readily distinguishable from all the other North American spe- 

 cies of the subgenus known to me by three structural characters of 

 importance, i. e., the extension forward of the frontal grooves on to 

 the epistoma, the thickened antennae, and the middle tibiae of the 

 males feebly bisinuate within near the apex. The middle tibiae are 

 not dentate in that sex, and it is often difficult to distinguish the 

 feel)le bisinuation, which is apparently the homologue of the teeth 

 occurring in our other species. In color and facies it differs al.-^o 

 from our other Cyrtonoti. It is, in many respects, a very aberrant 

 species, and seems to lead toward Bradytus ; but the posterior tibia' 

 of the males show no trace of the pul)escence characteristic of that 

 subgenus, and the prosternum is not margined at tip. On the 

 whole it seems best placed at the end of the present subgenus. 



TRANS. AM. ENT. SOC. XXXIV. ' FEBRUARY. 1908. 



