2o8 DAVENPORT ACADEMY OF SCIENCES. 



rather short. The bod}- of the male, besides being smaller, is 

 almost of equal diameter throughout, while the female is broader 

 and elongate-ovoid. 



Both sexes are ver}- active and run briskly about after leaving 

 the galls, particularlj- the males. 



During May of 1902 I happened again to observe the galls of 

 this species to be quite numerous on the leaves of Hicoria (Carya) 

 microcarpa and found on examination that each of the galls con- 

 tained from one to five or more of the stem-mothers, their eggs 

 and the sexes, and, to my surprise, found also a number of pupae 

 and winged migrants in some of them; which proves that the 

 habitually apterous species evolves from time to time a migra- 

 torj' form, to preserve the species against extermination. 



The migrant is orange ; the head, antennae, thoracic lobes, ster- 

 nal plate and legs dusky to black ; the wings are duskj-. The 

 antenaae are evidently four-jointed, the fourth joint is distinctlj- 

 petiolated, with the petiole being divided by three to eight or 

 more sharp annulations; the sensorium of joints three or four 

 being very much elongated. 



Ph^xloxera depress.^ Shimer. 



Dcuytlosphcera depressum Shimer. Trans. Am. Ent. Soc, 2, pp. 

 389-390. 



Phylloxera depressa Riley. Seventh Rep. Xox. and Ben. Ins. of 

 Mo., p. 118. 



Phylloxera depressa Thomas. Eighth Rep. Xox. and Ben. Ins. 

 of lUs., p. 164. 



Not having had an opportunity of seeing this gall, I am unable 

 to form an opinion as to its specific value and reproduce, there- 

 fore, the description as given by Shimer : 



"These galls were found to be exceedingly numerous on some 

 trees {Carya alba']. On June 20th they were smooth, slightly 

 rounded above, pale yellowish-green; beneath somewhat whiter, 

 and having in the centre a nipple-like projection ; opening round, 

 surrounded \v\\h a burr-like fringe composed of many filaments, 

 the cavity like an inverted cone, the wall above being quite thin 

 and translucent, so that the inmates may be seen mo\nng about. 

 This apparently \tTy flat gall was placed as much below as above 



