488 BULLETIN Ca, UNITED STATES NATIONAL MUSEUM. 



Ahdomen horizontal, moderately convex, coarsel}^ and more or less 

 obsoletely punctate; intercoxal process and first two segments at 

 middle third, distinctly and broadly concave, the concavity extendinci; 

 more or less upon the third segment, where it is rather semilunar in 

 outline, the concavity is limited laterally by a convex ridge, Avell 

 marked on first segment and there continuing the internal line of the 

 acetabula, less evident on the second segment. 



Legs rather short and scabrous; femora punctate, tibise muricate; 

 anterior tibia> more or less curved and slightly compressed; tibial 

 spurs similar in the sexes. Tarsi rather short; first joint of the ante- 

 rior with a distinct process beneath, plantar groove not well defined ; 

 apical margin of each joint somewhat prominent beneath; spinules 

 flavate, short and stout. 



Male. — Somewhat narrow. Eh^tra arcuately and slightly obliquely 

 declivous behind, abdomen strongly concave. Profemora with a 

 small and broad tooth at outer fourth. Protibia> distinctly and 

 briefly constricted at base, distinctly angulate at point of constriction. 

 First joint of the protarsi with a distinct and more or less rounded 

 process beneath, which is about a third longer than wide, truncate at 

 tip, where it is very incons]iicuously spinulose. 



Female. — Slightly broadened. Elytra arcuately and rather verti- 

 cally declivous, thence feebly and broadly sinuate before the moder- 

 ately oblique apex. Abdomen less strongly concave. Profemora 

 obsoletely dentate, tooth sometimes minute. Protibia^ feebly and 

 briefly but not suddenly constricted at ba.^e. First joint of the pro- 

 tarsi with a distinct process beneath which is about a fifth longer 

 than wide. 



Measiive'menta. — Males: Length, 11-12 mm.; width, 4-4.5 mm. 

 Femule: Length, 12.8 mm.; width, 5 mm. 



Genital cha farters, male. — Pkleagophore (Plate (J, fig. 7) oblong- 

 ovate, acutely i)ointed, not arched. 



Jiasale oblong-oval, twice as long as wide, evenly convex; sides 

 feebly arcuate. 



Apicale triangular, slightly elongate; disc evenly convex, without 

 a groove; sides feebly arcuate at basal third, thence slightly and 

 l)roadly sinuate at tip, tlie latter acute: base arcuately lobed at 

 middle, hitei'ally feebly sinuate. 



jSteriiife transversely trajx'zoidal. Each lobe triangular and rather 

 long; sides rather gi'adually and niulually convei-ging to apex, the 

 latter sul)acute although nanowly i^oiuuKmI; surface moiv or less 

 evenly convex, glabi-ous at l)ase and impunctate, ai)ical Iwo-thirds 

 more or less densely i)unctate and setose, seta' quite long, denser and 

 longer al)oiit apical margin. Sinus broad, membrane not setose. 



Female. — Genital segment (Plate (>, fig. KJ) sube(|uilaterally trian- 

 gular, valves reflexed and fully chitinized, moderately depressed. 



