DRTOBIUS EOBOEIS. 73 



stein forwarded to me numerous specimens of the 

 oviparous female from Montpellier. They were taken 

 on the branches of Quercus rohur, upon the bark of 

 which they had deposited numerous brown eggs, vide 

 Plate CIV, fig. 6. This nidus for the eggs is different 

 from that chosen by D. Croaticus, which deposits in 

 Southern France on the upper surface of the leaf of the 

 evergreen oak, Quercus ilex, as seen in Plate CIII, fig. 5. 

 M. Lichtenstein remarks " how wise of this insect to 

 know that the leaves of the ordinary oak will fall ! and 

 therefore it chooses the bark."* 



The oviparous female drawn in PI. CIII was taken 

 from a live specimen bred with others at Mont- 

 pellier. It agrees well with Kaltenbach's and 

 Koch's descriptions. As, however, the perfect female 

 had not before been figured, I thought an example, 

 though a foreign one, would not be without its value 

 to the entomologist. Koch found masses of similar 

 eggs disposed much like those of the lackey-moth, 

 Gastropacha neustria. A crust composed of perhaps 

 one thousand encircled a bough of oak. This mass 

 was about an inch broad, and probably was the pro- 

 duce of several oviparous females. 



In Germany the acorns seem to be attacked as well 

 as the soft stalks. According to Koch the stalked oak, 

 Quercus pedunculata, is preferred by D. rohoris. 



In the species described by Bonnet, and which is 

 probably identical with the above, he states there are 

 both apterous and alate males. Such may be the case, 

 but the observation requires confirmation by others, 

 though this phenomenon certainly occurs in other 

 genera of Aphides. 



Kaltenbach and Walker both include Lachnus fas- 

 ciatus of Burmeister in their synonyms of L. rohoris. 

 The former author states that he captured specimens 

 of L. rohoris on Pinus sylvestris and P. ahies. I think 



* As Quercus ilex is not a tree indigenous to Britain it is probable 

 that tlie choice of nidus differs in the two countries. I am not able to 

 state form personal observation the precise locale affected by the English 

 insects. 



