COLLETID.e. 187 



eyes from above tlie antennae not quite to the base of the 

 clypeus, the vertex of the head is also more incrassatec), 

 and narrower in proportion to the pronotal collar, which is 

 unusually wide in this species; the wings are slightly dusky 

 and the rugosities of the propodeum are coarser and 

 shining ; the puncturation of the abdomen is much larger and 

 deeper, especially in the ? , and its surface in that sex is less 

 shining, cj with the seventh ventral segment terminating 

 in two thin convex foliaceous lobes, under which are two 

 similar smaller ones, eighth terminating in a bifurcate 

 fringed process ; armature unusually large, sub-depressed, 

 stipites wide and transversely impressed across the middle, 

 Bub-truncate at the apex ; sagittaa very long, as long as the 

 stipites. 



L. 6 mm. 



Birch Wood ; {Sraifh). 



P. hyalinata, Smith. — Smaller than either of the 

 preceding, black, shining ; head and thorax very largely 

 and coarsely punctured in the (J, more finely in the ?, 

 face subelongate, very narrow between the eyes in the c?, 

 white below the antennae, and clothed with white hairs, 

 the colour extending slightly above their insertion on each 

 side, in the ? black with two yellowish triangular lateral 

 spots, in both sexes with the cheek between the eyes and 

 the mandible unusually long, nearly as long as the basal 

 width of each mandible, scape of the antennae in the c? 

 short and slightly swollen, the flagellum more or less pale 

 beneath in both sexes ; thorax clothed with short pale hairs 

 especially laterally, tubercles in both sexes, and two spots 

 on the collar in the ? , pale, wings hyaline ; abdomen 

 with the basal segment very shining, largely and remotely 

 punctured in the cj, finely, very shallowly, and less re- 

 motely in the ? , its apex bearing a lateral line of white hairs 

 in both sexes, second and following segments in the <? less 

 strongly and more closely punctured than the first, iu the 

 ? extremely finely punctured, apical segment in both 



