34 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Apical lobe roimded at aitex, deprestried, well cbitinized, more or less concave 



beneath, convex above : UctdbUipulis. 



5. Dorsal plate variable in form, not broadened externally, finely, very sparsely 



punctate, more or less feebly and very sparsely pubescent 6 



Dorsal plate broadened externally, margin strongly arcuate, rather coarselj- 

 punctate and sparsely clothed with rather long flying hairs on outer 



moiety I'romtix. 



(■>. Submarginal groove not visible from above; surface of dorsal plate at most 



but feebly concave, generally planei 7 



Submarginal groove dorsal or visible at some point from above; surface of 



dorsal plate more or less deeply concave Eleodes. 



7. Superior outline of genital segment quadrate, triangulo-parabolic to para- 

 bolic 8 



Superior outline more or less triangular. 



Outline triangular; dorsal i)late oblong-triangular, external border 

 at most but slightly arcuate, internal border not strongly arcuate 



at base BJamiJis. 



Outline subequilaterally triangular; external border of dorsal plate 

 arcuate, angle obsolete: superior membrane reaching to middle 



of dorsal plate T rich eleodes. 



S. Superior outline of genital segment quadrate to triangulo-parabolic; superior 

 membrane variable in length; dorsal plate oval-oblong, internal border re- 

 flexed and impunctate; external border moi'e or less arcuate, angle evident; 

 apex small and membranous: ai)pendage large, more or less semieliiiitical 



to subconical, depressed Litheleodcs. 



Superior outline parabolic, short: dorsal plate snbovate. extending upon the 

 apical lobe beyond the appendage, sides not reflexed : ai)])endage short, pro- 

 jecting from beneath the outer border of the apical margin of dorsal plate; 

 genital fissure subapical Pseud eleodes. 



The student must bear in mind in resorting to the iise of the above 

 table that care must be taken to familiarize himself with the general 

 structure of the genital segment. 



Besides the distinct generic ditferences there are in each subgenus 

 specific characters which can only be worked out positively Avith large 

 series, and, while of scientific interest, would not be of practical im- 

 portance in the separation of species. 



The male genital characters may be summarized as follows: 



Slenelrodcs. 



Apicale of the edeagophore broadly triangular, depressed on dor- 

 sum and more or less broadly membranous centrally; apexl 



more or less rounded J ■^''■f"'>l"l>uns. 



Apicale triangular and slightly elongate. couA-ex dorsally; apex more or less 

 produced and subacute. 



Mclciiicleodes. 

 Dorsum with an evident median, more or h-ss niend)ranous Eleodes. 



groove iLitlieleodes. 



Prom lis. 



Dorsmn without median groove, except in tibialis liUiinjUs. 



