Horn.] H4 [Feb. 21, 



narrowed to base, in front broadly rounded and suddenly narrowing to 

 apex, disc feebly convex with few scattered punctures. Elytra rather 

 coarsely scabrous with greenish bronze tinge. Body beneath and legs 

 with faint bronze lustre. Length .30-.40 inch ; 8-10 mm. 



Male. Fifth ventral truncate, sixth feebly emarginate at tip. 



Female. Fifth ventral truncate, sixth oval at tip. 



Spurs of hind tibiaj as in the preceding species. 



Occurs near the borders of the Colorado Desert at Santa Isabel and 

 near Cariso Creek. 



C, refulgens, Horn, Trans. Am. Ent. Soc. 1870, p. 91. 



Head brilliant metallic green, sparsely but coarsely punctured. Thorax 

 broader than long, sides moderately arcuate and evenly rounded at 

 apical and basal angles, disc moderately convex, with median round 

 aeneous spot, surface smooth shining with few punctures, color pale red- 

 dish yellow. Elytra brilliant metallic green, finely scabrous. Body 

 beneath brilliant green, tibiae cupreous. Length .32-.40 inch ; 8-10 mm. 



Male. Fifth ventral truncate, sixth slightly concave and emarginate at 

 tip. 



Female. Fifth ventral truncate, sixth oval at tip. 



Spurs as in the preceding species. 



Occurs near Millerton, California. 



Gkoup III. 



This group contains at present three species of moderate size in which 

 the antennae .of both sexes are very strongly compressed, especially in 

 the male, and the joints usually broader than long of nearly quadrate 

 form and scarcely one-third thicker than the width. The antennae are 

 also short, scarcely longer than the head 'and thorax. The thorax is 

 more nearly of spherical form than in any other vesicants. Both hind 

 tibial spurs are slender and acute. They may be thus distinguished : 

 Anterior tibiae § with two spurs. 



Antennae § moderately compressed. 

 Scutellum deeply sulcate to apex ; apex truncate . . . sphmritollis. 



Antennas g very strongly compressed. 



Scutellum feebly sulcate ; apex truncate eompressicomis. 



Anterior tibiae § without terminal spurs. 



Anterior femur § with spine near the base corn-era. 



C. sphEericollis. Say. Journ. Acad. Ill, 1828, p. 299 ; Am. Ent. pi. 3 ; 

 chalybea, Lee. Ann. Lye. V, p. 100 ; Proc. Aca'd. 1853, p. 335. 



Slender, shining, surface with strong aeneous or bronze lustre. Head 

 sparsely punctate. Thorax nearly spherical, narrower than the head, 

 and very sparsely punctate. Scutellum truncate at tip deeply channeled 

 along its entire length. Elytra elongate, parallel, surface finely scabro- 

 punctate. Body beneath and legs black with aeneous tinge. Length 

 .32-. 50 inch ; 8-13 mm. 



