157 



regard to sculpture he has fallen into some errors in his account 

 of the species. Crawford has pointed out (Can. Ent. 45 :154- 

 156, 1913) his error in sinking Hylaeus mesillae (.Cocker- 

 ell) as a variety of the widely distributed H. Cressoni ( Cock- 

 erell). I Avish here to make some additional notes and com- 

 ments. 



Hylaeus basalis (Smith). 



•This is a species of the Boreal and Transition zones and 

 seems to be coniined to them. All the specimens I have taken 

 have been from the mountains in California and Oregon. Metz 

 speaks of it as not restricted in its destribution. My localities 

 lor it are Oregon : Cascade Motmtains, — Detroit, Mt. Jefferson, 

 Three Sisters; Coast ^Mountains — Benton Co. (J. C. Bridwell). 

 California: Siskiyou Moimtains (F. W. .\ nncnmacher ). San 

 Jacinto ^^fountains (Bridwell). 



Hylaeus Nunenmacheri n. sp. 



The well-marked IlyJaeus hamlis (Smith) has liitlicrto 

 remained rather isolated. ^Nfetz' 7/. poiciis unly knuwn in 

 the male sex has genital characters similar but is quite differ- 

 ent externally from basalis. It was with interest that I haxc 

 discovered mixed with my material of hasalis a very simihir 

 but smaller species. 



$ Clypeus a little broader in proportion more sparsely i)nncturcd, tiic 

 punctures less oblique, the surface less lineolate, particularly apically ; 

 sculpture of basal area feebler and its integument more shining The 

 rugae are confined to a few sliort weak longitudinal ridges along the 

 anterior margin while there arc some reticulations in basalis. In both 

 species the integument of the area behind the rugosities is microscopi- 

 cally tessellate but it is shining as seen with a hand lens in \'iiiicn- 

 macheri, opaque in basalis. due to the greater impression of the lines 

 bounding the tessellations in tlie latter. 

 Length 7 mm. ; wing 5.5 nnn. 



$ Clypeus shorter and broader than in basalis. The integument of 

 the area duller than in the 9 but the rugae similar. 



Seventh sternite with the lateral lobes more transverse than in basalis 

 the sinus between them less profound, their posterior margin liraci -shaped 

 .- — ^ ■■ ^ while in basalis the posterior sinus is profoundly V shaped 

 and the sides are rounded off toward the base. 



