2O0 DAVENPORT ACADEMY OF SCIENCES. 



variation in the length and prominence of the third joint, which 

 is often much shorter than represented in the figure ; or it may 

 be longer in one antenna and shorter in the other, resembling in 

 the latter respect more Ph. pida. Wings delicate, faintly dusky 

 or almost colorless and rather short ; stigma dusky, with a 

 yellowish tinge or sometimes almost colorless ; veins very delicate, 

 especially the discoidal and stigmal veins, both of which are often 

 difficult to discern ; the stigmal vein in some specimens connects 

 with the stigma in both wings, in others either in the right or 

 left wing only ; whereas in others one or both veins curve away 

 from the stigma to connect with the third discoidal vein, 

 resembling in this respect c. -septum, from which it differs, 

 however, in its smaller and paler wings and venation, the paler 

 and almost smooth body and the more slender antennae. 



SECTION II. 



Phyi<i<oxera foveola Pergande, n. sp. 



Plate III., figs. 15, 16. 



The gall of this beautiful species is evidently closely related to 

 and may possibly be identical with Ph. foveata Shimer (Trans. 

 Am. Ent. See, II., p. 393), but considering the number of closely 

 allied species in which the galls resemble each other more or less 

 closely, and the fact that the inmates of his galls were winged 

 and plentiful by the 20th of June at Mt. Carroll, 111., whereas 

 the galls of foveola are nearly deserted by the ist of June, near 

 Washington, induce me to consider the two forms as specifically 

 different. 



I have found this gall during the latter part of Ma>' upon 

 Hicoria glabra in the vicinity of a small creek between Arlington, 

 Va., and the Potomac River. Most of the galls contained, as 

 early as May 23rd, numbers of the winged form. These galls 

 grew either singly or as many as forty upon a single leaf when 

 they become at times confluent, each retaining, however, its char- 

 acter and individual cell intact. On some of the trees they were 

 much more numerous, completely covering some of the leaves. 

 The diameter of the galls ranges more or less between 3-5"""- hor- 

 izontally and between i-3»="'- ^•erticallJ^ They are as a rule very 



