408 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Basalc elongate oblong, moderately and evenly convex above, sides 

 scarcely arcuate. 



Apicale triangular, slightly elongate, apex slightly recurved and 

 flattened ; surface moderately and evenly convex, with a narrow 

 median groove from apex to base; sides feebly and broadly sinuate 

 to near apex, thence briefly more convergent to tip, the latter subacute 

 and narrowly rounded ; base obtusely lobed at middle, laterally feebly 

 sinuate. 



Sternite subparabolic in outline. Each lobe triangular and mod- 

 erately distant from each other; external border broadly sinuate in 

 basal half, thence arcuate to apex, the latter subacute ; internal mar- 

 gin nearly straight; surface feebly convex, strongly and rather 

 densely punctate in apical two-thirds, setose, setae long, shorter at the 

 internal margin. Membrane not setose across the base of the sinus, 

 the latter rather broad and deep. 



Female. — Genital segment (Plate 5, fig. 10) subquadrate, dorsal 

 surface quite plane, glabrous and slightly setose. 



Valvida. — Dorsal plate oblong, smooth and shining; surface feebly 

 and irregularly concave, coarsely and very sparsely punctate, each 

 puncture with a rather long seta ; external border feebly and broadly 

 arcuate, more or less explanate apically; apical margin truncate and 

 transverse, angle rounded; internal border more or less feebly sinu- 

 ate. Apex small and subacute, apparently membrano-chitinous, very 

 feebly and inconspicuously setose. 



Appendage small and mammilliform, with a pencil of short seta?. 



Baml proTninences not evident. 



Superior pudendal membrane not usually rugulose, quite broadly 

 exposed and reaching about to the apical third of the dorsal plate. 



Ventrolateral surfaces. — Body subequilaterally triangular; ventral 

 surface lines nearly straight when viewed longitudinally, laterally at 

 base slightly prominent, thence inwardly oblique and then broadly 

 sinuate to apex, scarcely transversely concave l)ef()re the apex; sur- 

 face smooth, sparsely setose, setse short. Submarginal groove broad 

 and shallow beneath the moderately expanded external border of the 

 dorsal plate. Inferior surface of apex finely setose. Internal margins 

 of tlie valves contiguous in basal two-thirds; fissure about closed. 



^a&^Ya^5.— Washington (Pullman, May, C. V. Piper, U. S. National 

 Museum collection). 



Number of specimens studied, 3. 



Sexitypes in the U. S. National Museum collection (Cat. No. 12284). 



Type-locality. — Pullman, Wash ingt oi i . 



I)!(i(jnostu- characters. — Quite distinct in its more robust form, 

 more transverse pronotum, the sides of which are more strongly 

 rounded and dilated. 



