152 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Subgenus PROMUS LeConte. 



The first, or the first and second joints of the anterior tarsi of tlie 

 male, are more or less thickened and sometimes flattened beneath, 

 and densely clothed with fine pubescence. 



These characters are most strongly developed in goryl^ where the 

 pubescence is almost spongy and the tufts are distinctly flattened ; 

 the first joint of the mesotarsi also have a similar but smaller tuft. 



In fi/sifonnis, striolatd, and opaca the tufts are smaller and less 

 strongly flattened, and in inxulari.s and svhnitens the i^ubescent pads 

 are smaller and not flattened ; in the former the tuft is pointed and 

 in the latter siibtruncate, in both the pubescence is slightly longer. 



The form is usually more or less fusiform in outline, but in Insn- 

 lai'is the greatest width of the elytra is behind the middle, and the 

 insect is more ovate than fusiform. Some examples of suhnitenx are 

 subovate. 



The sides of the pronotum nearly always converge anteriorly and 

 the elytra become gradually broader in the same or nearly the same 

 line with the pronotal sides. This is most pronounced in opaca and 

 f'UsifoQinis; in striolata^ (/o>'U^- .luhiiite^hs, and insularis the sides of 

 the pronotum converge more or less posteriorly, so that the lateral 

 line is interrupted to a greater or less extent. 



S\ih generic genital cl\aracterf<^ male. — Apicale of the edeagophore 

 distinctly longer than wide, somewhat depressed, dorsal surface 

 moderately convex and nuirked by a more or less well defined mem- 

 branous, median groove; apex acute and moderately attenuated ; base 

 usually broadly lobed at the middle. 



Female. — Genital segment more or less quadrate, internal lobe of 

 the apex well develoi)ed, the external being I'udimentary. Sides of 

 the dorsal plate reflexed with the surface concave between, outwardly 

 explanate and more or less deflexed at the i)eripherv. The dorsal 

 plate has the external boi'der more or less arcuate, the surface strongly 

 punctate, conspicuously and sparsely setose, the setiv being quite long 

 and flying. 



Appendage more or less strongly flattened, conico-ellipsoidal or 

 transversely semiellipsoidi".], and usually quite large. 



Svperior pudendal iiieinhrioie reaching to the middle or apical 

 third of the dorsal j^late, \\\n\ obsoletely or irregularly longitudinally 

 rugulose. 



The giMiital characters of the female are distinctive* and definitely 

 charactei'i/t' the subgemis. An examination of the ])lates (4 and 

 5) will elucidate what has ali'cady l)een said. It will be observed 

 that the apjxMidage in itisvlaris is the smallest and most conical in 

 the series. 



