PERONEA CRISTANA. 245 



from us. Whilst in Italy and Portugal the insect is apparently 

 restricted to this plant, in Turkey, Trotter ('Nuovo Giorn. Bot. 

 ital.,' Firenze, vol. x, p. 218) reports it from Salicornia herhacea, 

 which is common enough here, but is unsuitable as a food for 

 the Baldratia, as our winters cut it off completely — hence the 

 gall on the solider stems of Salicornia ramosissima. 



The larval cavity is comparatively large, measuring 5 mm. 

 by 2 mm., and containing a single reddish-orange larva which 

 pupates therein and emerges the succeeding year. 



2. Stefaniella hrevipalpis (Kieffer). 



Here again we are concerned with an insect attacking a 

 plant, Obione j^oiiulacoides, on the very verge of its range. 

 Again southern entomologists have a far better chance of getting 

 the insect in quantity, although on our restricted colony I found 

 several galls, consisting of a shuttle- shaped swelling of the 

 somewhat woody stem, each hollow containing several reddish 

 larvae. 



To show how precarious an existence the insect leads with us 

 it is sufficient to state that a week later an enterprising goat- 

 keeper, who had evidently realised the potentialities of Cheno- 

 podiaceous plants as food for cattle, had tethered a goat amongst 

 it, with the subsequent destruction of over one-third of the 

 Durham stock of plants, and almost one-half of the Durham 

 colony of that rediscovered Psyllid Trioza atrx-plicis, which feeds 

 on Obioiie, and not on Atripkx yatida, as usually stated. As a 

 matter of fact, the latter plant straggles into the midst of a clump 

 of Obione carrying large numbers of the Coccid-like Trioza larva, 

 and is nevertheless utterly untouched. 



It is well to note here that Gelechia obsoletella, an insect not on 

 record for Durham, occurs in precisely the same patch of plants. 

 181, Abingdon Eoad, Middlesbrough. 



PERONEA CRISTANA : ITS LIFE -HISTORY, HABITS 

 OF THE IMAGO, DISTRIBUTION OF THE VAEIOUS 

 NAMED FORMS, AND SOME SPECULATIONS ON 

 THE PRESENT TREND OF ITS VARIATION. 



By W. G. Sheldon, F.E.S. 



(Continued from p. 222.) 



The Pupa. 



Length is 7*8 mm., width 1*5 mm. ; the abdominal segments 

 are light greenish-brown, the wing cases are dark greenish- 

 brown ; it is rather stout in proportion to its length. The 

 front three abdominal segments are of the same width as 

 the thorax when viewed dorsally, the next three are narrower, 

 they are of equal width; the seventh is narrower still, the 



