152 BRITISH ENTOMOSTRACA. 



1. Cypris tristriata. Tab. XVIII, figs. 1, 1 a-i; 2, 3. 



Cypris tkistriata, Baird, Trans. Berw. Xat. Club, i, 99, t. 3, f. 13, 



1835 ; and ii, 152. 

 Cypris pubera, Baird, Mag. Zool. and Eot., i, 524, t. 16, f. 1-13. 



Shell of an oval form, and somewhat reniform; the 

 valves convex, and of a green colour, more or less deep. 

 The anterior portion is of a deep green, immediately 

 behind which is a portion of a lighter colour ; the pos- 

 terior part is* of a less deep green, and has three narrow 

 bands or streaks, two of which are of a much deeper hue, 

 running obliquely across it. The whole shell is covered 

 with dense, short hairs. 



In some specimens, generally the largest, the shell is 

 of nearly a dnty black colom\ from the dirt which adheres 

 to it obscuring the marks Avhich distinguish the species. 

 Nearly in the centre of each valve is to be seen a congeries 

 of about seven small, lucid spots. The filaments of both 

 pairs of antennae are beautifully plumose. 



Hab. — Berwickshire ; near London, &c. ; not un- 

 common, all the summer months. 



2. Cypris vidua. Tab. XIX, figs. 10, 11. 



Cypris vidua, MiiUer, Zool. Dan. Prod., No. 2384, 1776 ; Entomos- 

 traca, 55, t. 4. f. 7-9. 



— Latreille, Hist. Nat. Crust., iv, 245. 



— Bosc, Man. d'Hist. Nat. Crust., ii, 297. 



— Desmaresf, 385, t. 55, f. 4. 



— Baird, Mag. Zool. and Bot., i, 133, t. 5, f. 1 ; Trans. 



Berw. Nat. Club, ii, 152. 



— M. Bdwards, Hist. Nat. Crust., iii, 399, t. 36, f. 4. 

 MoNOCULTjs viDUus, Gmeliii, Linn. Syst. Nat,, 3002, No. 42. 



— Manuel, Euc. meth., vii, 726, No. 36, t. 264, 



f. 24-26. 



— Jurine, Hist. Nat. Monoc, 175, 1. 19, f. 5, 6. 



— Bees, Cyclopaedia, art. Monoculus. 

 MoNOCULUs viDUATUS, Fabricius, Ent. Syst., ii, 496. 



Shell of an oval form, a little sinuated on under margin. 



