H YM ENOPTERO US PARASITES OF RHYNCHOTA. 313 



63. Mijzus ribis, Linn. 

 The only direct parasite known upon this species is Aphidius 

 ribis, Hal., which was bred from it by Bignell on June 10th, 

 1883, though it had long before been noticed by Reaumur 

 (iii. Mem. ix. 286) ; and it is this species, we must suppose, 

 upon which Allotria so largely prey, since it is abundant. 

 Allotria minuta, Htg., was bred plentifully from it by Bignell 

 (Trans. Dev. Ass. 1901), A. circumscripta, Htg., by Kirchner (Cat. 

 1867, 30), and A. tscheki from Aphids on Riles rubrum (Giraud, 

 Verb. z.-b. Ges. x. p. 128). Of Encyrtus lambinus, Walker, in 

 describing it (Ent. Mag. 1838, p. 422), says : "May; near London, 

 under a currant-leaf; probably a parasite of Aphis ribis." 



64. Drepanosiphum platanoides, Schr. 

 Allotria tscheki, Gir., is given by Gaulle (Cat. 27) as preying 

 upon Aphis platanoides (cf. Verh. z.-b. Ges. x. p. 128). 



65. Drepanosiphum acerina, Walk. 

 Marshall says (Br. d'Europ. ii. 583) that Bignell bred, on 

 July 15th, 1884, two females and one male of his Aphidius 

 pseudoplatani from this species, of which two individuals were 

 winged, together with its hyperparasites, Isocrates vulgaris, Walk., 

 and I. anew, Nees. Haliday noticed (Ent. Mag. 1835, p. 95) 

 that the pucerons infested with his synonymous Aphidius con- 

 strictus {nec Nees) became white, and many of them were winged. 



66. Megoura vicia, Buckt. 

 No direct parasites have been noted, and even the secondary 

 ones are all doubtful, since it is from Aphis vicia, Fabr., that they 

 have been ascribed. Thence Kirchner bred (Cat. 30) Allotria 

 erythrocephala, Htg., A. heterocerus, Htg., and A. melanogaster, 

 Htg. ; and Gaulle (Cat. 27 et 106) records A. victrix, Westw., 

 and the Chalcid, Aphelinus tibialis, Nees. Possibly these all 

 appertain to Siphonophora pisi, but M. vicia is very common. 



67. Megoura solani, ? auct.* 

 As preying upon this American species, Ashmead records (Bull. 

 Ent. U.S. Dept. Agric. 1887, p. 19) his new Encyrtus megoura.f 



f I have no idea to what species the "Aphis sur Lycium" thrice given 

 by Gaulle (Cat. p. 26) can refer. Buckton gives no species upon any Sola- 

 nacece. From it are recorded Alloxijsta filicornis, Cam., A. luteicornis, 

 Kief., and A. recticornis, Kief. 



Zool. 4th ser. vol. XII I., August, 1919. 2 B 



