TETEANEURA ULML 133 



"What takes place within these closed chambers can 

 only be surmised ; but from the cell- walls the solitary 

 Aphis gets her nourishment, and within them she 

 undergoes four moults (Riley and Kessler). After 

 these have been completed, she commences reproduc- 

 tion. The young vary much in number, but are all 

 blackish, with paler undersides ; their hinder parts 

 are furnished with a white woolly coat, mostly pro- 

 ceeding from the last body-rings. After the first 

 moult they become greener. 



Throughout the summer of 1879 this species was 

 common on most of the elms at Old Romney in Kent. 

 They seemed, however, mostly to affect the leaves of 

 Ulrims suberosa. 



The galls, when slit open early in June, showed 

 that they were still tenanted only by the Queen Aphis, 

 who had not completed her moults, for no exuvise could 

 be found. At this time the same trees were tenanted 

 by the leaf-rolling Schizoneura ulmi, which were much 

 more advanced, and were commencing to migrate. 



The progeny of the second generation numbers 

 forty or more, and after a while gives rise to the pup^e, 

 which again in due time disclose the winged females, 

 just as in Pem^jhigns. These imagos issue from the 

 pseudo-galls at different intervals, but the population 

 of the gall is kept up pretty constantly throughout 

 the summer by the Queen Aphis. 



Winged vivijjaroiis female. 



Inch. Millimetres, 



Expanse of wings 0*240 6*09. 



Size of body 0-080 X 0-030 2-02 x 076. 



Length of antennae 0'025 062. 



Head and thorax black and naked. Abdomen long- 

 oval, dark green or olive. Slightly powdered. An- 

 tenna very short ; third and fifth joints ringed. 

 Nectaries and tail wanting. Wing-membranes smoky. 



