1862.] 305 



Thelaxes ulinicola Fitcli. New imago. — Black, more or less pruinoee. Legs with 

 the base of the femora ami of the tibiae sometimes pale. Wings hyaline; costa to 

 the base of the stigma very pale futicous, the stigma a little darker; veins fuscous, 

 the ;!rd discoidal hyaline half-way from its base to the fork; hind wings with the 

 veins subhyaline. Length to tip of wings .05 — .07 inch. 



Niue specimens. The anteuuse do not quite attain the origin of the 

 first discoidal when the wings are expanded, and the stigma is twice aa 

 long as wide and hunched hoth anteriorly and posteriorly, its tips moder- 

 ately acute. Occurs ia elm-leaf galls, which are well described by Fitch 

 (loc. cit.) 



BYRSOCKYPTA Haliday. (Fig. 7.) 



Bifr»uLri/pta? {pemphi(/us) carysecaulia Fitch, (hickory) N. Y. Rep. I, 

 p. 155, winged insect unknown. — B? (pemjjhiffus) vitifoUse, Fitch, (grape 

 vine) ibid. p. 158, winged insect unknown. — B? (^pemphigus) caryxvenae, 

 Fitch, (hickory) ibid. II, §104, winged insect unknown. — B. (j^emjjhl- 

 gus) pop)ulicauli)i Fitch, (poplai-s) ibid. §353. — B? {pemplitguR') popnilar- 

 i(( Fitch, (poplar) ibid. §35-4. — B^ (^pcmpliigus^ pjopull-glohuU Fitch, 

 (poplar) ibid. §355. — B? {pemphigm~) populiccnse Fitch, (poplar) ibid. 

 §35(3. — B. hamameUdis Fitch, (conical follicles on upper surface of witch- 

 hazel leaves) N. Y. Cat. Homopt. p. 69. 8 species. 



1 have been unable to perceive that P. popidicaulis Fitch, which I find 

 very abundant on the leaves of the cotton-wood, (populus angulata) carries 

 its wings horizontally folded before it leaves the gall, as stated by its de- 

 scriber. I carefully examined many dozen specimens in freshly opened 

 tialls, and they all had their wings steeply roofed. The galls on the cot- 

 ton-wood are precisely similar to those figured and described by Fitch as 

 found on other poplars. 



PeinjjJiigus, is defined by Koch as having antennal joints 4 — 6 -'pretty 

 equally long." which is the case with the species described below under 

 that genus, joint 5 being a trifle the longest of the three, and apparently 

 also with P. pi/ri Fitch; for Dr. Fitch says that in the larva of that spe- 

 cies the penultimate is longer than the last joint. (3rd N. Y. Rep. p. 9.) 

 On the contrary in P. poimlicauli's Fitch the last joint is as long as the 

 two penultimate joints put together, which separates it g-enerically from 

 P. pjyri, and forbids its being referred to Pcmp)higas as limited by Koch. 

 In A/ihidsr- the comparative length of the joints of the antennas seems to 

 be of veiv high generic value, although the length of the whole antenna 

 varies roniarkably in species referred to the same genus. In Ap/iix n'bis, 

 for exani])le. tht- aiilcnnu' nearly attain the tips of the expanded wings; in 



