British Hymenoptera. 209 



with a slightly raised dorsal line. Abdomen subelongate, 

 finely punctured, the puncturation of the basal segment 

 rather more remote than that of the following ones ; 

 segments beneath not depressed, clothed with somewhat 

 adpressed hairs ; (for genitalia see pi. viii., fig. 14). Legs 

 clothed with grey hairs. 



? . Only differing from the (? in the wider shape, 

 shorter antennae, black clypeus, and rather more shining 

 abdomen, which is densely hairy beneath. Length 

 10 — 12 mm. 



Hah. Eare. Chobham, Weybridge, Barham, &c. 

 Known from all the British species by its ashy grey 

 thorax and large size. 



10. Halictus prasinus, Smith. 



Smith, Zool. vi., p. 2169, 1848 ; Cat. Brit. Hym., 2nd 

 ed., p. 92 =: hcemorrlwidalis, Schk. 



Black ; face elongate in both sexes, much narrowed in 

 front ; clypeus much produced ; apical segment of the 

 abdomen in the <? red ; head and thorax in the ? with 

 a greenish tinge. 



S- . Head and thorax black, with a very slight greenish 

 tinge, finely and closely punctured; face elongate, covered 

 with greyish white hairs ; clypeus considerably pro- 

 duced, truncate at the apex, and sometimes white across 

 its apical half. Antennae reaching to beyond the scu- 

 tellum. Thorax covered with short greyish hairs ; meta- 

 thorax finely and longitudinally rugose, its brow semi- 

 circularly rounded. Abdomen slightly shining, rather 

 finely and clearly punctured ; 1st segment covered at the 

 sides with whitish pubescence ; 2nd, 3rd, and 4th seg- 

 ments with a lateral spot of white pubescence ; 5th 

 segment with an almost entire basal band ; 7th segment 

 red ; beneath, 4th segment emarginate, but with a 

 scarcely observable fringe, 5th segment emarginate, 

 with a long fringe, apex of 6th segment much rounded. 

 Genitalia with the sagittae produced above the surface of 

 the stipites into two curved knife-like edges ; (see pi. ix., 

 fig. 9). Tarsi, and sometimes the base and apex of 

 tibiae, pale. 



2 . Larger and wider than the S' . Head and thorax 

 much as in that sex, except the black apex to the clypeus 

 and the short antennae ; green metallic tinge rather more 



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



