60 MISC. PUBLICATION 47 0, U. S. DEPT. OF AGRICULTURE 



Male, — Robust, moderately convex above, rather strongly sbining ; head and 

 pronotum cupreous ; elytra bronzy brown, with a faint cupreous tinge in dif- 

 ferent lights ; beneath uniformly brownish cupreous. 



Head uniformly cupreous, with a narrow, longitudinal carina on occiput, 

 the carina bifurcate on vertex ; front slightly convex, with two vague callosities ; 

 surface densely, finely granulose, coarsely, but not deeply, confiuently punctate, 

 more or less transversely rugose behind clypeus, sparsely clothed with long, 

 semierect, inconspicuous, cinereous hairs; clypeus broadly, deeply, arcuately 

 emarginate in front, broadly rounded on each side. Antenna uniformly cupre- 

 ous, gradually narrowed to apex ; intermediate segments as long as wide, 

 broadly rounded at outer margins ; third segment one-third longer than fourth. 



Pronotum twice as wide as long, subequal in width at base and apex, widest 

 along middle ; sides parallel and slightly sinuate along middle, slightly con- 

 verging at base and apex ; anterior margin slightly sinuate, with an obscurely 

 rounded, median lobe ; base broadly, angularly emarginate on each side, median 

 lobe broadly rounded ; disk moderately convex, with a broad, shallow, elongate, 

 median depression, and a moderately deep, rounded depression on each side 

 near apical angle : surface rather densely but not very coarsely, irregularly 

 punctate, transversely rugose, sparsely clothed with short, inconspicuous hairs. 



Elytra slightly wider than pronotum at base, nearly twice as long as wide; 

 sides nearly parallel from humeral angles to apical third, then arcuately 

 converging to tips, which are separately narrowly rounded; lateral margins 

 distinctly serrate posteriorly ; basal depressions deep ; humeral depressions 

 broad and shallow: surface indistinctly pubescent, finely, densely punctate, 

 transversely rugose between costae. Each elytron with four smooth, longi- 

 tudinal costae : first stra'ght, extending from base to apex, more strongly 

 elevated posteriorly ; second sinuate, extending from base to near apex, inter- 

 rupted in front of middle by a slightly depressed fovea ; third short, arcuate, 

 extending from basal fourth to apical fourth, interrupted at apical third by a 

 slightly depressed fovea : fourth extending along lateral margin from apex to 

 basal fourth, where it is joined to the third costa. 



Abdomen beneath densely, indistinctly granulose, coarsely, sparsely punctate, 

 rather sparsely clothed with recumbent, cinereous hairs, and with smooth, ele- 

 vated, lateral callosities ; last visible sternite deeply, arcuately emarginate at 

 apex, lateral margins strongly serrate ; eighth tergite coarsely punctate, but 

 not longitudinally carinate, upper margin slightly emarginate at apex. Prester- 

 num coarsely, rather densely punctate, rather densely clothed with long, recum- 

 bent, whitish hairs : anter'or margin with a broad, very short, median lobe. 

 Anterior femur with a large, obtusely triangular tooth, which is strongly 

 dentate on outer margin. Anterior tibia arcuate, with a broad dilation at 

 apex, the dilation nearly one-third as long as tibia and narrowed at apex ; 

 middle and posterior tibiae straight, the former abruptly dilated at apex. 



Length 11.5 mm., width 4.75 mm. 



Redescribed from the male lectotype, No. 42637, in the United 

 States National Museum. 



Female. — Differing from the male in having the head more sparsely punc- 

 tured and less densely pubescent, the prosternum sparsely punctured, the last 

 visible sternite broadly, shallowly emarginate at apex, the eighth tergite slightly 

 rounded or subtruncate at apex, and confiuently punctured, and the anterior 

 and middle tibiae unarmed at their apices. 



Type locality. — San Felipe, Lower California. 



DISTRIBUTION 



From material examined: 



Arizona: Sabino Canyon, March 1917, April 1918, and June 1919, reared (G. 



Hofer). Hot Springs, June 24 (Barber and Schwarz). Glebe (D. K. 



Duncan). 

 Lower California: San Felipe, May to August 1901; Santa Rosa (G. Beyer). 



Hosts. — Beyer reported this species very abundant on willow 

 (S alios sp.) during the dry season in May and June at San Felipe, 



