SOHIZONEURA CORNI. 109 



several living- winged individuals of Sch, corni from 

 Montpellier. They arrived on the 5tli of December, 

 and on their journey they gave birth to several yellow- 

 ish-red and greenish young. M. Lichtenstein regards 

 these as the true males and females, and very probably 

 they are such. Nevertheless, a careful examination 

 under a high magnifying power did not show to me 

 either any included egg or the usual male organs. As 

 the insects, however, could not have been many days 

 old, these structures may not have had time for de- 

 velopment. One argument in favour of these young 

 being the two sexes is, that they are very different 

 in form and colour from the rest. The presumed 

 male is rather linear, and cylindrical ; shining yellow, 

 with well-developed antennse and prominent eyes. 

 The female is stout, oval, green, and has eyes much 

 smaller. Ten of these forms were examined, and all 

 were distinctly rostrated. The sizes were, for the 

 male 0-027 XO'Oll inch, for the female 0-024x0-013 

 inch. 



M. Lichtenstein thinks it probable that the Schizo- 

 neurlncB have both aerial and subterranean forms ; that 

 is, that they migrate from the roots of grasses and 

 wheat to the branches of trees. In this manner he 

 thinks the Continental Sell, venusta of Pass., which 

 affects many different kinds of grass roots, may 

 prove to be the winter form of Sch. ulmi or /Sch. 

 lanuginosa. I have no experimental proofs of such 

 migrations from tree to tree to off'er; and Professor 

 Piley is inclined to deny altogether the fact of this 

 migration. 



The before-mentioned Pempliigiis vagahundus is 

 not likely to be met with in this country ; for it is 

 said to breed on the cotton- wood of America, on the 

 leaves of which it forms large cockscomb-like galls, 

 and also to be unable to subsist on any other trees. 

 Nevertheless, in Missouri, the winged females may be 

 plentifully taken at the fall of the year, on numerous 

 dissimilar plants, on which, like their European allied, 



