220 



THE ZOOLOGIST. 



Typhlocyba. 



Kiley has observed Labeo typhlocyba (Ashm. Bull. U. S. Nat 

 Mus. 1893, p. 89) to be parasitic upon an uninstanced species of 

 this genus. 



33. Typhlocyba ulmi, Linn. 

 On July 17th, 1904, I took a number of this species on elms 

 on the outskirts of Ipswich, and find the following MS. note in 

 my diary : — In one of these I discovered a white maggot, of 

 certainly the same species as that taken from Psallus variabilis, 

 but more fully developed. I sent it to Saunders, who thought it 

 not Coleopterous, and too large for Elenchus. I think it Hyme- 

 nopterous ; the oral organs and segmentation are more distinct 

 in this species than in the former. 



34. Typhlocyba douglasi, Edw. 35. T. hippocastani, Edw. 



The late Prof. Alfred Giard has given an excellent account of 

 the parasitism of Aphelopus melaleucas, Dalm., upon these tw T o 

 species in his " Sur la Castration Parasitaire des Typhlocyba par 

 une Larve d'Hymenoptere " (Compt. rend. Acad. Sc. Paris, 1889, 

 p. 708; cf. also 4 Insect Life,' 1890, pp. 271-3), in which he 

 clearly shows that the genital organs are rendered abortive by 

 the parasite's presence, in such a way that "wholesale para- 

 sitism " results as far as the succeeding generations are con- 

 cerned. 



36. Typhlocyba rosce, Linn. 

 The above or probably an allied species is also referred to 

 by Giard, " Sur une Galle produite chez le Typhlocyba rosce, par 

 une Larve d'Hymenoptere " (loc. cit. pp. 79-82). It is certainly 

 a Proctotrypid of some kind. 



37. Pachypsylla celtidis gemma, Kiley.* t 

 From a Psyllid bearing this name Howard describes his Chal- 

 cid, Encyrtus pachypsylla (Descr. N. Amer. Chal. 1885, p. 15). 



38. Trioza centranthi, Vail.* 

 Andre has given an account of breeding no fewer than three 

 distinct species of Chalcididce from this Homopteron, which 



f Several species of Fossors provision their nests with species of the 

 genus Psylla, but this can in no way be termed parasitism. Thus : — 

 Psenulus pallidipes, Passalcecus gracilis, and Crabro palmarius are known 

 to store up Psylla alni ; and Psenulus concolor an undetermined species of 

 the same genus (Gaulle, Cat. 129 et 137). 



