Horn.] U-'J [Feb. 21, 



surface scabrous, with purplish tinge with greenish reflection. Body- 

 beneath and legs metallic green, shining. Length .40 inch ; 10 mm. 



Male. Fifth ventral broadly emarginate, sixth longitudinally impressed 

 acutely emarginate at tip. 



Female. Unknown. 



Hind tibial spurs as in the preceding species. 



Occurs from Sacramento to Millerton, California. 



0. stygica, Lee. Ann. Lye. V, p. 161 ; Proc. Acad. 1853, p. 335 ; 

 imaragdula, Lee. Ann. Lye. V, p. 160; Proc. Acad. 1853, p. 334; loc. cit. 

 1859, p. 78 ; dolosa, Lee. Proc. Acad. 1861, p. 354. 



Head with few coarse punctures on the side of the occiput. 'Thorax 

 slightly broader than long, sides in front moderately arcuate, behind 

 slightly narrowed to base, disc feebly convex sparsely punctate. Elytra 

 nearly 7 twice as wide as thorax, scabrous. Color of body above and 

 beneath variable, from black with slight bronze tinge (stygica) bluish or 

 dark violet (dolosa) to green, more or less brilliant (smaragdula). Length, 

 .36-.5G inch ; 9-1 1 mm. 



Male. Fifth segment broadly emarginate, with trapezoidal acutely 

 notched. 



Female. Fifth segment truncate, sixth crescentically emarginate. 



Spurs of hind tibiae dissimilar, inner slender acute, outer somewhat 

 stouter obliquely truncate. 



This species is very variable in the coloration of the surface as will be 

 seen by the above description. The Oregon specimens are totally black 

 and somewhat more roughly sculptured, those from Mendocino, Cal., to 

 Sacramento are bluish and smoother, those from the lower end of the 

 Tulare Valley and thence to the borders of the Colorado Desert are the 

 ' more brilliant. 



Distributed from Oregon to the borders of the Colorado Desert. 



0. auriculata, Horn. Trans. Am. Ent. Soc. 1870, p. 91. 



Head black, moderately shining, sparsely punctate, vertical spot and 

 and hind angles broadly red, occiput truncate. Thorax slightly broader 

 than long, sides in front broadly rounded behind parallel, disc feebly 

 convex and with coarse punctures sparsely placed ; color black feebly 

 shining. Elytra with bluish green lustre coarsely scabrous. Body 

 beneath and legs black, moderately shining. Length .36-.50; 9-13 mm. 



Male. Fifth ventral segment broadly and feebly emarginate, sixth 

 trapezoidal, longitudinally concave, emarginate at apex with the lateral 

 processes moderately prominent. 



Female. Fifth ventral truncate, sixth broadly oval at tip. Spurs of 

 hind tibiae as in the preceding species. 



Occurs in the high Sierras near Keyesville, California. 



C- aeneipennis, Lee. Ann. Lye. V, p. 160; Proc. Acad. 1853, p. 338. 

 Head in front of eyes black, occiput red, coarsely but sparsely punc- 

 tured. Thorax one-fourth broader than long, red, sides gradually 

 a. p. s. — VOL. XIII. o 



