214 



THE ZOOLOGIST. 



course of ten years' observation seen parasitic Hymenoptera 

 in cop., and in both with no intervention from myself. 



In the present paper I have contented myself with indicating, 

 with detail wherever such was obtainable, the species of Hyme- 

 noptera preying upon the various sorts of Rhynchota, as recorded 

 by the authors to whom I have had access. Probably there are 

 a great number of other records : I have not seen them. To 

 Prof. B. Oshanin of the St. Petersburg Academy of Sciences, to 

 Robert Newstead, Esq., the learned author of a monograph upon 

 the British Coccidae, to Ernest A. Elliott, F.Z.S., and other 

 gentlemen I am greatly indebted for valuable information. 



Extra-British hosts are denoted by a suffixed asterisk. 



HETEEOPTER A. 

 1. Pentatomid^:. 



At least four species of the Proctotrypid genus Telenomus, 

 Hal., are known to pass the early stages of their existence within 

 the eggs of uninstanced species of this family. These are T. 

 cultratus, Mayr (Verb. z.-b. Ges. 1879, p. 699) ; T. plialanarum, 

 Nees (Gaulle, Cat. Hym. France, 1908, 115) ; and T. pentatomce, 

 Rondani (Bull. Soc. Ent. Ital. 1874, p. 135, et I. c. 1877, p. 199). 



2. Tectocoris lineola, Fabr., var. banksi, Don.* 



Dodd suggests (Trans. Ent. Soc. 1904, p. 485) that the 

 " brooding " habits of the maternal Pentatomidce serve as a pro- 

 tection against Hymenopterous oviparasites. He says : " I have 

 frequently had ova of Hemiptera produce ichneumons ." 



3. Eurygaster manra, Linn. 



Telenomus sokolowi, Mayr (described in Horse Societatis Ent. 

 Rossicae, xxx. (1897), p. 442 ; cf. Sokolow, lib. cit. p. 444 et 

 Traveaux du Bureau d'Entom. Petersburg, 1901, No. 17), at one 

 time caused the almost total extinction of this Hemipteron in the 

 Government of Charkow ; the latter had previously become so 

 numerous that the entire crops of wheat and rye were ruined by 

 it, and in some parts the peasants had had to abandon their 

 cultivation. Prof. Oshanin tells me that the allied Telenomus 

 semistriatus, Nees, is also parasitic upon the same species' eggs 

 in the Crimea, according to M. Mokrzecti, 



