244 



THE ENTOMOLOGIST, 



The dependence on temperature of the characters of the 

 spring brood of P. napi is shown by the observation of Mr. Hawes, 

 quoted by Tutt (/. c. p. 236). Part of the offspring of a female 

 of this brood emerged in the summer with the usual characters 

 of the summer brood; but the remainder did not emerge till the 

 following spring, when they presented the characters of the 

 spring brood. The behaviour of P. rai-)cB this spring appears to 

 be in harmony with this result, the exceptionally cold weather 

 having exaggerated the features of the spring brood in those that 

 were earliest out. 



Both results show that the critical time for the development 

 of pigment is near the end of pupal life. 



I should be much interested to know if other collectors have 

 had a similar experience to mine. 



BALDRATIA SALICORNI^ (KIEFFEE) AND STE- 

 FANIELLA BREVIPALPIS (KIEFFER), TWO 

 CECIDOMYID^ NEW TO THE BEITISH FAUNA, 

 WITH REFERENCES TO OTHER INSECTS. 



By J. W. Heslop Haeeison, D.Sc. 



1. Baldratia salicornicB Kieffer. 



FoK several years now my friend Mr. Bagnall and myself 

 have devoted much of our very limited leisure to the study of that 

 extremely interesting group, the Cecidpmyidse, and with no little 

 success. Much of our work has been done systematically, i. e. 

 we have deliberately planned out a campaign on a certain group 

 of plants and have carried it out. Amongst the many plants 

 designed for examination the salt-marsh plants almost of neces- 

 sity fell to me. Consequently, in the winter of 1916 and the 

 early spring of 1917, 1 worked Greatham Marsh for its specialities, 

 but my gole success was to find small numbers of old galls on 

 Saliconda stems. Still I was not disheartened, and botanical 

 survey work gave me many opportunities of working the ground, 

 with the result that I swept a number of the present insect from 

 the Salicornia and later discovered one gall. 



Kieffer states that the gall is a lateral swelling, red in colour, 

 affecting the internodes of Salicornia fniticosaL. (= radicans Sm.). 

 My specimen was collected from a red-coloured form of Sali- 

 cornia ramosissima ; this rendered the gall very hard to detect. 



My aim in writing the present note is to invite workers in the 

 South to attack their much richer Salicornia flora, especially 

 the species Salicornia radicans. We here are on the extreme 

 northern limit of the range of this plant ; in fact, it is not on 

 record for Durham, although I have found it sparingly there 

 after discovering the insect. Naturally we cannot expect any 

 great numbers of a southern insect on a plant slowly dying out 



