Inskct Galls. 47 



Cecidomyia pellex Osten Sacken. Ash midrib-gall. 



Cecidomyia pellex Osten Sacken, in I.oew's Mini. dipt. X. A , 1862, i > t . 1. p. 199. 



Cook, Ohio, nut., 1904, v. 4. p. 140, litf. 114; 29th mm. rept. Dept. geol. and nat. 



res. Indiana f. 1904, L905, p. 838-839, tij,'. 31. 

 Beutenmiiller, Ins. Ralls vicin. X. Y., 1904, p. 26, tig. 

 Jarvis, 37th ami. rept. Knt. SOC. Ontario, 1906, p. 07, pi. E, li^. .">. 



Consists of the swollen midrib of the leaflet. One or several leaflets 

 may be deformed. Renifonn, smooth, juicy, mainly on under side of the 

 leaflet, 15-30 mm. long. Pale green, frequently with much red. Rather 

 common on white ash, Fraxinus americana. May and June. 



POLEMONIA L ES . 



CONVOLVULACEAE. 



Convolvulus sepium. 



Lasioptera convolvuli Felt. Fig. 94. 



Lasioptera convolvuli Felt, 22d rept. ius. N. Y. f. 1906, 1907, p. 149-150; '23d rept. ins. X. Y. f. 1907, 

 1908, p. 318, 3'26. 



An elliptical swelling of the main stem. About 1 cm. long and two 

 and one-half times the diameter of the stem. The outer portions are pithy 

 with some longitudinal spaces. The orange larva apparently occupies the 

 pith-cavity, surrounded by the unchanged walls. September. On upright 

 bindweed, Convolvulus spithamaeus, and on hedge bindweed, C. sepium. 



Convolvulus spithamaeus. 

 Lasioptera convolvuli Felt. See above. 



LABIATAE. 

 Trichostema dichotomum. 

 Stagmatophora sexnotella Chambers. Blue-curls stem-gall. Fig. 95-96. 



Gelechin sextioMln Chambers, "Bull. U. S. geol.-geogr. surv., 1878, v. 4, p. 88. 

 Mompha sexnotella Busek, Journ. N. Y. ent. soc., 1902, v. 10, p. 97-98, pi. 12, tig. 7. 



Dyar, List N. A. lepid. (Bull. 52, IT. S. nat. mus.) 1902, p. 543, no. 6168. 

 Stagmatophora sexnotella Walsingham, Proc. U. S. nat. mus., 1907, v. 33, p. 219-220. 



This monothalamous gall is an enlargement of the stem, often just be- 

 low the flowering branches of blue-curls, Trichostema dichotomum. It is 

 irregularly reniform, tapering somewhat above, ending bluntly below. 

 They average about 18 by 6 mm. The surface and coloring are similar to 

 •those of the stem. The thick spongy walls enclose a cavity following the 

 general curl of the gall, extending below however, through the wall to a 

 projection at the base of the concave side, where it is separated from the 

 exterior by the epidermis of the stem only, thus providing for the escape 

 of the adult which could not eat its way out, having no mandibles. 

 Abundant. 



