26 BEES OF GREAT BRITAIN. 



profusion, and males are sometimes taken as late as the 2/th of 

 October : it is very plentiful in the London district. 



4. Halictus zonulus, 



H. ater, pallide rufo-pubescens ; abdominis segmentis basi laevi- 

 bus. Mas, pedibus posticis totis nigris. 



Halictus zonulus, Smith, Zool. vi. 2171. 22 $ $ . 

 Nyland. Revis. Ap. Boreal, p. 241. 9. 



Female. Length 4^-5 lines. Jet-black ; clypeus moderately 

 produced, ciliated with -pale fulvous pubescence, the face has a 

 thinly scattered ochraceous pubescence; the thorax strongly 

 and closely punctured, the metathorax rugose ; the tegula; 

 nigro-piceous ; the wings subhyaline, faintly clouded at their 

 apical margins, the nervures ferruginous; the pubescence on 

 the thorax and legs fulvous, brightest on the tarsi and posterior 

 tibiae. Abdomen subovate, shining, the base impunctate, other- 

 wise finely punctured ; the second and third segments have on 

 each side a little short white pubescence on their basal margins, 

 the fourth sometimes has an indistinct narrow white band ; the 

 extreme apex pale fulvous. 



Male. Length 3J-4 lines. Black ; the face clothed with short 

 white pubescence ; the clypeus scarcely produced, having a 

 transverse white spot at the apex, sometimes obliterated ; the 

 thorax has a thin pale ochraceous pubescence ; the wings as in 

 the female; legs black, the claws ferruginous. Abdomen 

 oblong-ovate, otherwise as in the female. B.M. 



This species very closely resembles leucozonius, but the ab- 

 domen is less pubescent and more finely punctured, the base 

 being impunctate ; the male is distinguished by its black legs 

 and less produced nasus, which is frequently black ; the insect 

 is also larger. 



This bee is found on Plumstead Common in August, and has 

 been received from Bristol and Scotland. Dr. Nylander says it 

 occurs both in Denmark and Sweden. 



5. Halictus quadricinctus. 



H. ater ; cinereo-subpubescens ; abdomine convexo, segmentis 

 margine albis ; pedibus anoque pallido-villosis. 

 Hylaeus quadricinctus, Fair. Ent. Syst. ii. 303. 3 ; Syst. Piez. 319. 



