COLKOPTERA. 103 



minute study certain modifications of special organs are seen wliicli 

 are quite positive, but the nature and importance of wliicli we can- 

 not from our very limited knowledge interpret with any degree of 

 certainty. Probably the best course to pursue in such a dilemma is 

 to describe the aberrant form and let the truth be discovered in the 

 future, when more material shall have been accumulated. In tliis 

 case it is very desirable to obtain a series of d/'JJlcilis, in order to see 

 what variations occur in its male sexual characters. 



7. E. sexiialis n. sp. — Form robust. Color throughout uniformly rather 

 dark reddish-ferruginous, legs just visibly paler ; pubescence sparse, very 

 long, bristling and coarse, somewhat conspicuoiis, especially on the elytra 

 and abdomen ; integuments very highly polished, very remotely, minutely, 

 and feebly punctulate. Head rather large, a little broader than long ; eyes 

 moderate, very convex, and prominent ; genae not prominent, strongly con- 

 vergent, as long as the eye ; base transversely and rather strongly sinuate ; 

 interocular surface having two round, feebly impressed, spongy-pubescent 

 foveae at one-third the length from the base, three-fourths more widely 

 separated than either from the eye, connected by an anteriorly arcuate para- 

 bolic impressed channel, slightly longer than the distance between the foveae, 

 and becoming more longitudinally dilated and deeply impressed at the apex 

 just behind the frontal ridge ; the impressed channel does not terminate 

 posteriorly in the foveae, but extends behind them toward the genae ; inter- 

 mediate surface very strongly and prominently convex, very gradually 

 declivoiTS anteriorly nearly throughout its length ; supra-antennal tubercu- 

 lations very large and strongly developed, swollen and angulate externally, 

 connected by the nearly straight, transverse, and very strong frontal ridge, 

 which, however, becomes lower and very narrow in the middle, where it is 

 feebly notched ; labrum very strongly constricted at base, anterior margin 

 transverse, lateral angles very acute ; antennae nearly as long as the head 

 and prothorax together, very robust, coarsely setose, joints three to eight 

 very slightly transverse, just visibly increasing in width, eighth scarcely 

 narrower than the second, ninth transversely oval, scarcely one-third wider 

 than long, tenth somewhat longer, nearly twice as wide as long, eleventh 

 distinctly wider than the tenth, ovular, finely, abruptly, and strongly pro- 

 duced at the tip. Prothorax widest just before the middle, where it is dis- 

 tinctly wider than long and very slightly narrower than the head ; sides 

 arcuate anteriorly, straight posteriorly ; ajpex less than one-half as long as 

 the pronotal width and two-thirds as long as the base ; disk broadly convex, 

 having a very narrow elongated fusiform impression in front of the middle, 

 and, at one-third the length from the base, a nearly transverse deeply 

 impressed channel, broadly dilated and deepened into a very prominent 

 impressed puncture in the middle and terminating laterally in two circular 

 deeply impressed spongy-pubescent foveae ; the basal margin also has an 

 indentation just within each basal angle. Elytra at base slightly wider than 

 the pronotum ; sides rather strongly divergent and strongly arcuate ; disk 

 rather strongly convex, nearly quadrate ; sutural striae very strong, close, 



