Sept., i9i6.] AcKERMAN : Carpenter-Bees OF U. S. 229 



Xylocopa calif ornica arizonensis Cockerell, South. Cal. Acad. Sc, No. 6, p. 87, 



June, 1904. 

 Xylocopa arizonensis Maidl, Ann. Nat. Hist. Hof.-Mus Wien, p. 310, 191 2. 



Length of female, 25-27 mm. ; of male, 22-24 iTiiii- 



Female. — Head thick, almost as wide as thorax, black, blue and 

 purple mixed; well punctured, especially on the face; hairs entirely 

 black; mandibles black, very wide, with two teeth, base not depressed 

 and with few punctures, inner longitudinal groove not very deep, 

 outer one faint ; labrum semioblong, emarginate in the middle so as to 

 form two lobes, small and black ; clypeus flat, closely punctured, black 

 and blue, longitudinal carina very faint ; lateral foveolse and frontal 

 grooves of median depth; frontal shield iridescent, wide, flat in its 

 lower half, deeply concaved above just beneath the point of the frontal 

 carina, which is short, blunt, with the upper margin convex ; ocelli 

 large, median one deeply sunken, posterior ones very carinated in 

 front, no ocellar pits present ; eyes small and wide apart ; antenucC of 

 usual female type ; vertex prominently raised behind the posterior 

 ocelli, brilliantly blue colored, large and close punctures ; cheeks well 

 punctured, deep purple. 



Thorax black, blue and purple, disk large and unpunctured ; hair 

 black everywhere, short and sparse above ; scutellum well punctate 

 except on anterior margin, blue colored and wide, post-scutellum nar- 

 row and well punctured. 



Abdomen brilliant blue with purple reflections, punctation fine and 

 sparse above, very abundant below, hairs everywhere black ; epi- 

 pygium large, wide at the base, spines stout. 



Wings fuliginous, violaceous blue with purple tints, tegulse blue. 

 Legs bluish purple with black hairs ; tibial scale large and prominent, 

 both lower teeth sharp, the anterior one more narrowed throughout, 

 irregularly notched above. 



Male. — Differs from the other sex as follows: Head smaller, not 

 so thick, face narrower, blue and purple ; mandibles much smaller, 

 lower tooth at apex much larger; labrum of one triangular lobe, ap- 

 pearing trapezoidal in some specimens ; clypeus convex, more sparsely 

 punctate, longitudinal carina more prominent ; frontal shield convex 

 and not concaved above, lateral foveolse and frontal grooves deeper ; 

 frontal carina pointed, upper margin flat ; median ocellus not deeply 

 sunken, less carinated in front; eyes much larger, slightly converging 



