PERGANDE — NORTH AMERICAN PHYLLOXERINiB. 257 



Rather stout, ovoid, slightly curved and curiously sculptured, so 

 as to recall four-leaved rosettes. Color rather dull greenish-gray, 

 rendering detection very difficult. 



Phylloxera Cary^-ren Riley. 



Plate XVIII., fig, 143. 



Phylloxera caryes-ren Riley. Seventh Rep, Nox. and Ben. Ins. of 



Mo., p. 118. 

 Phylloxera catycs-ren Thomas. Eighth Rep. Nox. and Ben. Ins, 



of 111., p. 164. 



Since the description of this gall nothing new has been added 

 regarding its earlier stages and development ; nor have I had the 

 opportunity of studying its architects. 



The galls usually grow, like those of the preceding species, in 

 clusters, though occasionally singly, upon the main petiole, the 

 leaf -stems or the midrib of the leaves of Hicoria glabra, usually 

 along the underside. Frequently, however, they are so closely 

 crowded together as to completely encircle the petioles, never 

 becoming confluent, however. They are always placed trans- 

 versely with the axis of the petiole, more or less distinctly reni- 

 form and divided along their entire transverse length in two equal 

 halves or lids, the ed-ges of which are incurved and pressed closely 

 together while young, but spread open for some distance when 

 mature to allow the insects to escape. The size varies from 

 2_j^mm. ^jj(j ^jjg outer surface is densely pubescent and of a pale 

 green coler, with the interior smooth and yellowish-brown. The 

 walls are rather thick and hard and similar in composition to the 

 husks of the nuts. 



Additional Species of Phylloxera Inhabiting Various 



Other Trees. 



Phylloxera castane^ Hald. 

 Plate XVIIL, figs. 143-150. 



Chermes castanece Hald. Am. Journ. of Sci. and Arts, 2nd Ser., 

 Vol. IX., 1850, p. 108. 



