368 CALIFORNIA ACADEMY OF SCIENCES. 



where the margin is rather coarsely serrate; disc not 

 costate nor foveate, a vague basal fovea, surface less 

 coarsely and closely punctate than the thorax. Body 

 beneath green or blue, coarsely punctate, smoother on 

 the prosternal flanks and the anterior portion of each 

 ventral segment. Margin of last ventral acute, not ser- 

 rate. Length, .32 inch; 8 mm. 



Female. — Anterior femur broadly toothed, the outer 

 edge serrulate. Last ventral truncate, the angles of the 

 truncation acute and moderately prominent. 



Alalc. — Unknown. 



Sierra El Chinche (2,000 feet) and San Jose del Cabo. 



This species belongs to a small group represented by 

 four forms peculiar to the fauna of western Boreal- 

 America and three to Mexico, one of the latter occurring 

 in Arizona. The essential characters of the group are: 

 last ventral segment not serrulate at the sides, elytra 

 separately rounded at apex without trace of cost^ or 

 discal foveas. With the exception of prasiiia the elytra 

 in all have three purple-black fascia? more or less broken 

 according to the species. 



The forms known may be arranged in the following 

 manner: 



Species rather large and of robust form, tip of abdonien exposed, punc- 

 tuation of surface rather coarse; elytra with three iuterrujjted black 

 fasciae. 

 Sides of thorax regularly arcuate. atrifasciata. 



Sides of thorax oblique in front. Ulkei. 



Smaller and more depressed species, elytra entirely covering the abdomen, 

 punctuation not dense. 

 Elytra with the usual purple- black fasciae. 

 Anterior angles of thorax obliquely truncate. 



Sides of thorax nearly straight; elytral bands reaching the suti;re. 



junrta. 

 Sides of thorax sinuous; elytral bands not united across the suture. 



lucana. 



