84 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



apicalh^; apical border strongly arcuate on the external lobe, the 

 latter occupjdng the entire apical margin, with a small sinnation sep- 

 arating it from the minute internal lobe; internal border nearly 

 straight, at times more or less sinuous. Apical margin clothed Avith 

 rather long flying soft settp. 



Appendage not visible beyond the margins of the fossa, short 

 mammilliform. 



Basal prominences not evident. 



Superior pudenelal menihrarie longitudinally rugulose, and reach- 

 ing to opposite the internal apical lobe. 



Ventrolateral surface (Plate -2, fig. 7) moderately convex basally 

 and feebly concave before the apex, punctuate and setose, seta^ rather 

 short, long about the fossa; submarginal groove moderate beneath 

 the somewhat explanate external border of the dorsal plate, curving 

 iuAvard beneath the external apical lobe to the fossa. Internal mar- 

 gins of the valves contiguous in basal eighth; fissure rather broadly 

 fusiform, closed in the basal half by the inferior pudendal membrane. 



Variations in genital characters. — In the most ventricose specimen 

 that I examined the entire apical border was taken up b}^ the exter- 

 nal lobe; the internal lobe was not evident from above; the dorsal 

 plate was narrower than usual. The genital segment viewed ven- 

 trally showed the inferior border of the valvular membrane as form- 

 ing the internal wall of the fossa, and that the internal lobe was 

 therefore small and ventral. Appendage slightly com])ressed. 



In a specimen exhibiting marked variation. I found the setse 

 shorter, and the external lobe of the apex more membranous; the 

 sides of the dorsal plate were quite straight and parallel ; the internal 

 lobe was ventral as above, and the inferior pudendal membrane was 

 longer than usual. 



Habitat. — California (about the Bay of San Francisco, Esch- 

 scholtz; Mount Diablo, Thomas Casey; Monte Bello. near Mountain 

 View, Santa Clara County, Edward Ehrhorn ; San Emigdio Canyon, 

 Kern County, Fordyce Grinnell). 



Number of specimens studied, 500. 



Type, location unknoAvn to me. 



Type-locality. — Foothills near San Francisco. 



Salient type-characters. — Thorax punctulate. subquadrate. broadest 

 anteriorly ; elytra punctato-striate. Body of the male subcylindrical, 

 of the female obovate (Eschscholtz). 



Diagnostic characters. — The strongly developed anterior spurs of 

 the anterior tibiae (females) characteristic of the present section, 

 separate qvadricollis from all the members of the Carhonaria section. 

 But it will be necessary to actually scrutinize the anterior spurs of 

 the very robust examples of oniissa, where the anterior spurs are cer- 



