2 THE ENTOMOLOGIST. 



quite halfway up the face. Cheeks bare, jowls narrow, about one 

 sixth the height of eye. Palpi stout and black. Antennae very long, 

 third joint quite four times the length of second, arista bare, distinctly 

 thickened to about the middle, second joint not much lengthened. 

 Scutellum blackish grey, terminal bristles crossed and not erect, 

 though sHghtly upturned. Abdomen ovate, with discal and marginal 

 macrochetae. Hind tibiae with unequal bristles, ungues microscopi- 

 cally pubescent, nearly as long as last tarsal joint (male), much shorter 

 (female). Wings with first posterior cell open, ending just before 

 wing tip, angle of cubital vein slightly rounded and without an 

 appendix, radial vein bristly at base only. Length 4-6 mm. 



Zenillia {Myxexorista) roseana was described by Brauer & 

 Bergenstamm in Denkschr. Akad. Wien Iviii. (1891) p. 332. It 

 was known to them in the female sex only, the specimens having 

 been bred from Tortrix roseana, Hw., and no one appears to have 

 recognised the species since. 



Mr. Adkin has also reared another parasitic dipteron from 

 Tortrix pronuhana which appeared with the above ; this second 

 species is Nemorilla maculosa, Mg., which is reported as having 

 been bred on the Continent from Acrohasis consociella, Hb., 

 Cacoecia murinana, Hb., Psecadia hipunctella, F., Rhodophaa 

 suavella, Zk., Sylepta ruralis, Scop., and Pyralis sp. 



Newmarket: December, 1908. 



The first traces of the parasite referred to above were seen 



in June last, when, in the cage in which I was keeping the pupae 



of Tortrix pronuhana, I found several dipterous not unlike small 



houseflies in general appearance. Upon closer investigation I 



found among the leaves in which the Tortrix had pupated the 



puparia from which the dipterons had emerged. In the autumn 



I again collected wild larvae of T. pronuhana, which in due course 



pupated, and the dipterons again began to appear. I therefore 



made a careful examination of the pupal webs, and in many 



cases found a dipterous puparium in the web alongside the 



lepidopterous pupa; in every case the pupa had been fully 



formed before the parasitic larva emerged from it. The number 



of pupae infested I should estimate at fully twenty per cent. 



Tortrix roseana, the species from which Bergenstamm reared 



the original specimens of Zenillia roseana, occurs in the same 



gardens where T. pronuhana is found, and is also pretty generally 



distributed throughout the surrounding country ; it is therefore 



quite likely that the dipteron may all along have infested that 



species, but been overlooked, and that having found a more 



suitable host in the double-brooded T. pronuhana, has been able 



to multiply more rapidly, and even become a serious menace to 



its existence; yet it should be noted that larvae of Tortrix podana 



and Batodes angustiorana, taken in some numbers at the same 



time and place as the spring larvae of T. pronuhana, showed no 



signs of the parasite. — Egbert Adkin. 



