HYMENOPT EROUS PARASITES OF RHYNCHOTA. 217 



the Orobitidce. This I cannot credit, since it was very certainly 

 apodous ; and now I am strongly of the opinion that it belonged 

 to the Dryinidce, since it answered almost ad amussim to the de- 

 scription of Gonatopus pilosus, Thorns., given by Mik (Wien. Ent. 

 Zeit. 1882, pp. 218-9). 



15. Ranatra linearis, Linn. 16. Notonecta glanca, Linn. 



The Mymarid, Prestivichia aquatica, Lubb., devours the eggs 

 of both these aquatic species {cf. Trans. Linn. Soc. 1863, p. 140; 

 'Nature,' 1896; E.M.M. 1898, p. 152; Proc. Ent. Soc. 1899, 

 p. xv. ; I. c. 1900, p. xii. ; Deut. Ent. Zeit. 1908, p. 137). Enoch 

 found, on opening eggs of the latter species, that many imagines 

 — Prof. Heymous says eleven to sixteen is the usual number, 

 though Enoch once bred thirty-four in a single egg — were in 

 each egg, and these swam about freely upon being liberated ; in 

 one he found copulation in progress before emergence (a unique 

 circumstance in parasitic Hymenoptera, and one conducive to in- 

 breeding). Their size is sometimes double that of others, though 

 always equally fully developed. 



HOMOPTEEA. 

 17. Cixius contaminatus, Germ. 

 Dryinus formicarius, Latr. — "D'apres Capron, cet insecte 

 pourrait bien etre parasite de Cixius contaminatus. Germ., ayant 

 ete capture a Shiere but un buisson d'Erable habite par de 

 nombreux individus de cet Homoptere " (Kief. Procto. i. 79). 



18. Membracim. 



Ashmead, in his " Classification of the Fossorial, Predaceous, 

 and Parasitic Wasps" (Canad. Ent. 1902, p. 288), says that 

 Dryinina prey upon Mcmbracides, though he instances no species. 

 Dale's Ilomopterophagus dorsettensis, which he thought "must 

 belong to the Acari," and is scheduled as such in the 1 Zoological 

 Record' for 1879 {cf. 'History of Glanville's Wootton,' 304) is 

 most certainly a larva of the same subfamily {cf. also Kirkaldy, 

 Entom. 1906, p. 14). Even Buckton (Brit. Cicad. ii. 40) was 

 doubtful whether these sacs were Proctotrypidce or larvae of 

 Trombidia. 



Zool. 4th ser. vol. XIII., June, 1909. 



s 



