414 BULLETIN (J3, UNITED STATES NATIONAL MUSEUM, 



Sternite subhemispherical in outline. P^ach lobe quite triangular; 

 external border evenly arcuate, apex broadly rounded, with the in- 

 ternal margin more or less arcuate; surface densely punctate and 

 setose in apical half, seta? long and dense. Membrane not setose 

 across the bottom of the sinus, the latter moderately wide. 



Female. — Genital segment (Plate 1, fig. 4) subparabolic in outline, 

 strongly chitinized, not setose. Superior pudendal membrane 

 broadl}^ exposed, dorsal plates widely separated. 



Valvvla. — Dorsal plate subfalcate, with surface more or less con- 

 cave, and rather coarsely, sparsely punctate; margins slightly con- 

 verging to the apical margin, which is more or less rounded. Internal 

 surface of the valve inwardly declivous and more or less exposed, 

 finely and densely punctate, slightly excavated beneath the apex, 

 the latter chitinous, semi-oval in outline, flattened, projecting up- 

 ward and backward, moderately divergent, tip broadly and evenly 

 rounded, with the surface feebly convex and quite strongly punctate. 



Appendage minute, scarcely projecting beyond the margins of the 

 minute fossa. 



Basal protiiherances feeble. 



Svperior pudendal membrane attaining the apical fourth of the 

 segment, longitudinally rugulose. 



Yentrolateral surface!^ conjointly ogival Avhen viewed from below, 

 straight when viewed longitudinally and not inflated, sparsely punc- 

 tate. Apex concave beneath, the concavity extending forward and 

 laterally, so that the dorsal plate appears expanded and the sub- 

 marginal groove broad. Internal margins of the valves contiguous, 

 the genital fissure closed. 



Ilahitat. — California (San Diego, Orange, Los Angeles, Kern, and 

 Santa Cruz counties). Lower California (San Pedro Martir). 



Number of specimens studied, 51. 



Location of type not known. 



Type-locality. — " California " ( Mannerheim ) . 



Salient type-characters. — Elongate, shining. Thorax, convex and 

 rounded; femora, mutic; elytra, finely granulato-punctate (Manner- 

 heim). 



Diagnostic characters. — Readily recognized by the elongate and at- 

 tenuated form of the males; the females, while elongate, are also more 

 robust, at times decidedly so. The most common form of sculpturing 

 observed is that in which the elytra are smooth, polished, minutely 

 and rather sparsely punctate, the punctures being diffusely placed. 



I have many specimens with more or less distinctly indicated and 

 closely placed series of punctures on the elytra, and they were not 

 from any one region. Mannerheim's type had the elytra finely granu- 

 lato-punctate. This form of sculpturing is less common. The thorax 

 is finely and sparsely punctulate. 



