378 



Phyllophaga forbesi, n. sp. 



Moderately elongate, subcylindrical, rufotestaceotis, moderately 

 shining. Clypeus broadly emarginate, moderately reflexed; both cly- 

 peus and front rather coarsely and very closely punctate. Prothorax 

 one half broader than long; sides arcuate, nearly parallel posteriorly, 

 narrowed in front, margins entire ; surface much less closely punctate 

 than front, with an indistinct fovea on each side in front of middle. 

 Elytra more closely and deeply punctate than prothorax, discal costae 

 feeble. Pygidium of male broader than long, surface irregularly 

 wrinkled, vaguely punctate; of female, smoother, less vaguely punc- 

 tate, nearly as long as broad. Metasternum closely and finely punc- 

 tate, hairs short and sparse. Abdomen finely, faintly, and sparsely 

 punctate, nearly smooth at middle. Claws strong, slightly intramedian 

 in male, median in female. Hind tarsi similar in both sexes. 



Length 14-17 mm. 



Male. — Antennae 10- jointed, club a little shorter than the stem. 

 Abdomen broadly concave, penultimate segment feebly emarginate at 

 middle, with a roughened space in front of the faint emargination ; 

 last segment deeply emarginate, with an obtuse or rounded cusp at 

 each side of the emargination, the middle of the segment abruptly de- 

 pressed, the depressed area but little roughened, and with a distinct 

 transverse ridge at posterior margin. Fixed spur of hind tibiae short 

 and narrow, outer spur long and slender. 



Female. — Club of antennae much shorter than the funiculus. Spurs 

 of hind tibiae slender. 



Many specimens. Abundant in southern Illinois in late June, July, 

 and early August. 



This species is very nearly allied to epJiilida Say and unifonuis 

 Blanchard {Carolina Fall). It resembles both of these species in all 

 of the more obvious characters, and is rather common in collections in 

 the ephilida series. It may be assumed that specimens bearing an 

 Illinois label, and properly placed in the ephilida series, are of this 

 species ; since ephilida Say does not occur in Illinois. 



While this species is not easily separated from ephilida bv the ex- 

 ternal characters alone, the genital characters of the two species are 

 strikingly different. The male genital structures are symmetrical in 

 both species. In the apical portion of these structures, however, in eph- 

 ilida the ventral margins are entire, the ventro-distal angles are pro- 

 duced to form elongate, rounded lobes, and there is a very characteris- 

 tic pair of long, slender, curved processes that arise from the dorso- 

 lateral margins of the distal opening and extend distad, in a general 



