British Hymenoptera. 201 



Division I. 



(4) 1. White bands of the abdomen interrupted only on 



the upjjer segments. 

 (3) 2. ^ , mandibles not dilated ; J with yellow posterior 



tibim . . . . . . . . . . . . . . rubicundns. 



(2) 3. (^ , mandibles dilated ; J , posterior tibia? black . . A^-cinctus. 

 (1) 4, Segments of abdomen with only a spot on each side marvhiHif:. 



1. Halictiis ruhinmdus, Christ. 



Christ, Hym., p. 190, pi. xvi., fig. 10; Smith, Cat. 

 Brit. Hym., '2nd ed., p. 79. 



Black ; head and thorax covered with brown hairs 

 (fading to grey in old specimens) ; segments of the 

 abdomen with white apical fringes ; posterior tibiae and 

 tarsi clear testaceous in both sexes. 



^ with the head finely and closely punctured ; the 

 clypeus and labrum flavous. Antennae reaching to about 

 the scutellum, slightly brownish on their under side. 

 Thorax punctured as the head ; metathorax finely and 

 longitudinally rugose at its extreme base, rugosely punc- 

 tured on the rest of its surface. "Wings hyaline, scarcely 

 darker at the apex. Abdomen elongate, very finely 

 punctured, the puncturation somewhat rugose and irre- 

 gular ; the 1st, 2nd, and 3rd segments each with a 

 narrow apical band of white hairs, the 1st and 2nd in- 

 terrupted in the middle ; surface of all the segments 

 clothed with scattered pale hairs ; beneath with the seg- 

 ments depressed ; the 4th and 5th emarginate, especially 

 the 5th ; (for genitalia see pi. viii., fig. 8). All the femora 

 black ; the tibiae and tarsi flavous, with a dark spot on 

 the inner side of the former. 



? very like the ^ in coloration, but wider and more 

 massive. Antennae short ; clypeus black ; head and 

 thorax closely punctured, densely clothed with brown 

 hairs ; metathorax rugosely punctured. Abdomen finely 

 punctured, banded as in the <? , but with an entire band 

 on the 4th segment ; 5th segment densely covered with 

 golden hairs on each side of the central ridge. Legs 

 covered with golden hairs. Anterior tarsi only jDale ; 

 intermediate tibiae at the apex and tarsi, and the whole 

 of the posterior tibiae and tarsi, clear testaceous. Length 

 10 mm. 



A very distinct species, and the $ known at once from 



TRANS. ENT. SOC. 1882. — PART II. (jULY.) 2 D 



