\QQ ^ December, 



Migrations of Plant-lice. — My suppositions about the change of habitat of 

 the Aphides, belonging to the group of the Pemphigians (mostly gall-makers on 

 trees), have become a reality. 



I can afErm to-day that the gall-louse of the Lentiscus, Aploneiira lentisci, 

 Passerini, passes, when it becomes winged, to gramineous plants {Bromus sterilis, 

 Hordeum vulgare), and there deposits apterous young ones, which feed on the grass 

 roots during the winter, and in spring become winged and return to the Lentiscus, 

 where they deposit the sexuated pupcB. From these pupae emerge both males and 

 females "without rostrum ;" they copulate, and the female lays " a single egg," from 

 which proceeds the gall-maker. This is a new confirmation of my theory about the 

 cycle of life of a Pemphigian, viz. : — 

 (1.) The egg : generally only one in each female ; out of it comes : 



The Fundator (first larval state) forming the gall, becoming, after four moults, 



a vivigemmous Pseudogyne, and filling up the gall with its proles. That 



proles becomes, after four moults, 

 (2.) the Emigrant (second larval state), winged Pseudogynes, also vivigemmous, 



leaving the galls and flying on to gramineous plants, on which they deposit 



small lice, which are 

 (3.) the Gemmantia (third larval state). This is the curious stage of unlimited 



apterous reproduction under ground, very much in the same way as the 



Phylloxera vastatrix ; out of these numerous colonies in spring, emerge 



some nymphs, giving a winged form, which is 

 (4.) the Pupifera (fourth larval state), winged Pseudogyne, which carries back to the 



Lentiscus the pupae, from which the little apterous male and female lice, 



destitute of rostrum, issue, and, after copulation, the female lays the 



fecundated egg, which closes the circle. 

 J. LiCHTENSTEiN, La Liroude, pres Montpcllier: IQth November, 1878. 



The Douhleday Collection. — Since the publication of Mr. A. B. Tarn's letter in 

 the "Entomologist," for October, on the above subject, I have inspected the "Double- 

 day Collection," at Bethnal Grreen. 



I attended at the Museum fully expecting to see the collection in a most 

 appalling and disgusting condition, but my fears were totally unfounded. Drawer 

 after drawer was duly inspected, and returned to its place, but, strange to say, 

 no signs of mites, grease, or any other kind of neglect appeared. The whole 

 collection was in the most exquisite and unparalleled condition, and, to say the least 

 of it, is the best I have ever had the pleasure to inspect. I cannot conceive why Mr. 

 Farn should accejot questionable information and publish it in such a manner, and as 

 an unbiassed individual I am decidedly of opinion that some satisfactory explanation 

 is due; — surely some mistake has been made. With regard to the question of adding 

 fresh insects to the collection — perhaps Mr. Farn will kindly mention some other 

 method of replacing old and faded specimens (of which, however, I failed to find any) ; 

 I candidly admit that I am totally unable to do so. 



I am informed that three parcels only have been received in answer to the 

 notice — a fact, I beheve, almost entirely due to Mr. Farn's letter ; although I am 

 equally sorry to see outside specimens added to the collection, in the absence of any 

 other suggestion I would submit that a small round-punched label, coloured red, 

 should be affixed, by transfixing with the pin, under the bodies of the fresh specimens 

 in such a manner that a portion of this mark of their origin may be seen ; this 



