278 BULLETIZSr 63, UNITED STATES NATIONAL MUSEUM. 



or less sinuate toward base; apical margin squarely truncate and 

 transverse; angle rectangular or narrowly rounded, with a few rather 

 long setve that are also sparsely distributed along the apical margin. 

 Apex small, subacute, with a tuft of a feAv rather short setae. Fossa 

 rather large. 



Appendage quite large, flattened and triangular or semi-elliptical, 

 broad as long, setose toward tip, with a tuft of quite long setae. 



/Superior pudendal 7ne'mbran£ attaining the middle of the dorsal 

 plate and quite distantl}' longitudinall}" rugulose. 



Ventrolateral surfaces (Plate 3, fig. 8). — Body slightly inflated at 

 base, rather strongly and transversely concave before the apex, rather 

 strongly and sparsely punctate; settc along the ventral margin of the 

 fossa rather long and flying. xVpex quite densely setose beneath. 

 Submarginal groove well developed beneath the projecting external 

 border of the dorsal plate. Internal margins of the valves contiguous 

 in basal third, genital fissure rather broadly fusiform and closed in 

 basal half by the inferior pudendal membrane. 



Two forms may be recognized as follows: 



Forma typica. — Glabrous. Elytra with striae of small unimpressed 

 punctules or punctures which are frequently not very evident, inter- 

 vals somewhat or very irregularly punctulate. Males dimorphic. 

 The typical males are very strongly but not suddenly caudate; the 

 atypical males with the females have the elytral apices moderately or 

 scarcely produced, and not caudate. 



Measurements. — Males: Length, 16.5-30 nnn. ; width, 5-10.5 mm. 

 Females: Length, 24.5-28.5 mm.; width, 8-9.5 mm. 



Forma punctata. — Glabrous. Antenna stout, attaining the pos- 

 terior third of the prothorax. Elytra with serial punctures moder- 

 ately large, often eroded and feebly impressed, the series rather closely 

 placed and often irregularly duplicated, intervals irregularly and 

 finely punctulate. rather more densely so laterally', males apparently 

 homomorphic and with the females'*have the elytral apex moderately 

 produced and not strongly caudate. Legs rather stout. 



Measurem^ents. — Males: Length, 22-28 mm.; width, 8-8.5 mm. 

 Females: Length, 22.5-20.5 mm.; width, 8.5-10.5 nun. 



Habitat. — Forma typica. — California (San Diego County; San 

 Diego, elevation 50-300 feet. F. E. Blaisdell, E. C. Van Dyke, 

 Charles Fuchs, and collecticm U. S. National ]\ruseum; Poway, eleva- 

 tion 700 feet, F. E. Blaisdell ; Los Angeles County, E. C. Van Dyke ; 

 Santa P>arbara ; Fort Tejon, April 19-21, Fuchs and Hopping; Tulare 

 County: San Bernardino County); Lower California (San Pedro 

 IVfartir. collection California Academy of Sciences). 



Forma punctata. — California (Los Angeles County, E. C. Van 

 Dyke). 



Xumbci' of specimens studied, 120. 



