Sept., I9i6.] ACKERMAN : CaRPENTER-BeES OF U. S. 213 



blue, well punctured, with a black, shining, impunctate space along 

 the lower margin; longitudinal carina not present; frontal shield on 

 same plane as clypeus, sides sloping, of a greenish blue color; frontal 

 carina small and pointed, upper margin flat for a distance, then 

 changing into a furrow which is concurrent with the groove sur- 

 rounding the median ocellus; posterior ocelli slightly carinated in 

 front, causing them to appear a little sunken behind, and midway 

 between them is a short furrow extending from the median ocellar 

 groove ; small circular ocellar pits occur behind the posterior ocelli ; 

 under side of flagellum of antennae piceous, otherwise black; eyes 

 rather small and far apart; vertex somewhat raised on top just be- 

 hind the ocelli and sparsely punctured ; cheeks also sparsely punctured. 



Thorax black on disk, otherwise blue and purple, well punctured; 

 hairs black, with some pale ochraceous ones on the scutellum and post- 

 scutellum and a small patch on each side just below the tegulse ; scu- 

 tellum rounded and well punctured; post-scutellum very narrow. 



Abdomen brilliant bluish purple ; punctures small, fine and close, 

 especially on the first and second segments ; a patch of white hairs 

 on the sides of segments one, five and six, and a few white ones on 

 sides of the intervening segments ; otherwise black ; epipygium very 

 narrow at the base, spines rugged. 



Wings fusco-hyaline with a violet tint, darker at the apical mar- 

 gins; tegulse blue. 



Legs bluish purple, pilosity black except some brown on the inner 

 surface of the fore tarsi. Tibial scale small, the anterior tooth 

 being long and pointed, the posterior one very short and rounded. 



Male.- — Differs as follows : Head with yellow color on labrum, 

 clypeus, frontal shield and lateral areas of frons between the clypeus 

 and eyes as high as the insertion of the antennae, and on the lower 

 side of the first segment of the antennae; whitish-yellow hairs on the 

 face, vertex and cheeks ; head not as wide as in female, face much 

 narrower, especially in its upper half; mandibles narrower, convex 

 along the middle, only two teeth present, the lower one being much 

 the larger, dark brown with a slight yellow spot appearing at the 

 base in some specimens ; labrum larger ; clypeus somewhat convex ; 

 an unpunctured longitudinal carina evident ; a shallow furrow behind 

 each posterior ocellus extending backw^ard for a short distance and 

 ending abruptly on the vertex; eyes much larger and converging 

 strongly above, producing a very narrow vertex. 



