British Hymenoptera. 213 



ill-defined lateral spot of white pubescence at the base ; 

 beneath shining ; (for genitaha see pi. ix., fig. 4). Legs: 

 femora black, with their extreme apex pale ; tibiae pale 

 yellow at the base and apex and along their upper mar- 

 gin ; tarsi pale yellow ; ai)ical joint brown. 



2 . Closely resembling cylindricus and alhipes, but 

 known at once l)y the close even puncturation of the 1st 

 abdominal segment, and its greater width at the base ; 

 also by its metathorax, which, as described in the <? , is 

 without the well-defined basal area observable in those 

 species. Unlike the S , however, the apex of the meta- 

 thorax, viewed from in front, is truncate or slightly 

 raised at the sides, but not sharply angulated at the 

 sides as in ci/lindrieus ; the abdomen also is more densely 

 clothed with pubescence, and the sides of the metathorax 

 beneath far less rugose. Length 7 — 9 mm. 



Hab. Not a common species. I have taken both 

 sexes at Chobham, and the ? at Wandsworth ; I have 

 seen males from Hastings, and the late F. Smith took 

 the ? at Cromer. 



At Chobham, in April, 1878, there was a colony of this 

 species burrowing in the path of a garden ; the females 

 flew about till nearly 3.30 p.m., and then commenced 

 throwing up fresh mould from their burrows, but I failed 

 to ascertain how late they continued their operations. 



14. Halictus longulus, Smith. 



Smith, Cat. Brit. Hym., p. 39 (1855) ; Cat. Brit. Hym., 

 2nd ed., p. 99. 



? . So like the preceding that it might easily be taken 

 for a small variety of it ; there are, however, points of 

 difference which I think clearly indicate its right to be 

 considered as a distinct species ; besides its smaller size, 

 its metathorax, looked at from in front, is not distinctly 

 margined and truncate on the brow, is narrower towards 

 the apex, and less rugose at the base ; the 1st segment of 

 the abdomen is rather more shining, punctured only 

 on its apical htilf, and the puncturation distinctly 

 sparser ; the abdomen also is more elongate and more 

 depressed. 



The ^ , which I believe belongs to this species, is 

 black, with the apex of the clypeus, the labrum, and the 

 mandibles yellow ; the antennae reaching to about the 



