220 " [March, 



I am, of course, not witTiout some suppositions as to the relations of 

 my pupifcrous lice to the ^^ emigrants,''' and until some entomologist is 

 able, by breeding or otherwise, to demonstrate the true connexions 

 between these insects, I would suggest the following names : 



Pupiferous lice arriving on the stems of Pistacia terehintlius (from 

 May to July). 



^ Five-jointed aiiteuuaB 4. 



( Six-jointed „ 2. 



r Antennfe hairy (I sapposo pupiferous form of utricidarius) Pemphigus utriculo'ides 



I „ glabrous 3. 



f The first two neurations united at the base (of coniicularius). . P. corniculoides 



L „ „ separated „ (of pallidus) P. paUidoides 



f Antennee hairy (of semilmiarius) . . P. semilun aides 



L ,, glabrous (of follicularius) . . P. foUiculoides 



Of course, these names can only be transitory, and must disappear 

 whenever proof shall be made that my suppositions are w^ell founded. 

 But it is not an easy task to breed such little creatures under the 

 microscope, and perhaps some years will pass before the full history 

 of the Terehintlius gall-lice is elucidated. 



For our English friends I can say that the poplar and the elm offer 

 the same problems to solve. Six species on elms : Tetraneura uhni, 

 T. alha, CoJoplia compressa, ScJiizoneura lantifjinosa, Sch. uhni, PempJii- 

 gus uJmi ; and five on poplars: P. aj/inis, 2'>02^iili, ma?-supialis, vesicarius, 

 hursarius. Here it is, perhaps, still more difficult : the emigrants and 

 the pupiferous transpose themselves, and when the first leave the galls, 

 sometimes the second arrive and take up their lodgings in the very 

 same gall left shortly before by the emigrants. I observed pupiferous 

 forms on poplar as late as August, and now, to-day (9th February), 

 in an old gall of P. hursarius, I find eggs and dry skins of female lice 

 witJiout 7'ostrum ; of course they have not been laid by the emigrant 

 forms, as they always produce rostrated agamous young ones (P. 

 spirothecce always excepted). 



I must remark that old dry galls very often serve several different 

 kinds of lice to hide their eggs, thus, I have found in the same gall 

 wdiite, red, and green eggs, of which some gave me true Apliidce (long 

 antennae and cornicles), and some Pemphigians. 



I hope to be able next summer to give the full history of some of 

 these Pemphigians of the poplar, while Prof. Kessler, of Cassel, will 

 certainly give us that of some species from the elm tree. 



La "Lirondo, Moutpellier : 



10/// February, 1880. 



