230 Journal New York Entomological Society, t^'o'- xxiv, 



above, so that the face is quite reduced; vertex above flat, punctures 

 smaller, cheeks less thickened. 



Thorax having pale ochraceous hairs mixed with the black above 

 and on the sides, black hairs below. Abdomen somewhat shorter, 

 pale ochraceous hairs on the whole of the first segment, otherwise 

 black; punctation above much finer and closer on the first four seg- 

 ments, coarse but abundant on the remaining segments. Wings about 

 as in female ; legs with tibial scale reduced. 



Variations. — I have a male from Alamogordo, N. M., which has 

 been described by Cockerell as a variety (an::oncusis) of the species 

 califoniica. I include this individual as a variation of the species 

 ari::oncnsis (Cress.). It differs from the typical male ariaoncnsis 

 described above, only as follows : Clypeus yellow except along the 

 lower margin where it is black ; two brown longitudinal bands on the 

 yellow area. 



Types. — A female lecto-type No. 2621, from Tucson, Arizona, and 

 a male allo-type from Prescott, Arizona, in the Acad. Nat. Sc. at 

 Philadelphia. 



Distribution. — Arizona, New Mexico, Lower California, Texas 

 and Mexico. 



This species can be recognized by its brilliant blue color and by 

 the fuliginous, almost opaque wings. It resembles calif ornica very 

 closely and has even been called a subspecies of it. The wings of 

 ariaoucnsis are much darker and more deeply colored than those "^f 

 calif ornica and the color of the integument of the two species also is 

 specifically different. Having studied the types of arizoncnsis and 

 calif ornica as well as having found a dift'erence in the genitalia, there 

 is no doubt in my mind that they are distinct species. The female of 

 arizoncnsis has the hairs of the abdomen black everywhere, while the 

 calif ornica female has pale ochraceous hairs on the first abdominal 

 segment. The male of ariconensis has pale ochraceous pilosity on 

 the sides of the first abdominal segment only, while calif ornica has 

 these pale hairs on the whole first segment as well as on the hind 

 margin laterally of segments three and four and a few along the sides 

 of the intervening segments. From the above I see no reason why 

 these two species should be regarded as one, even though both have 

 many structural characters in common. 



On plate III, fig. 27, of The Insect Book Howard figures Xylocopa 

 arizoncnsis. 



