Insect Galls. 41 



Robinia pseudacacia. 

 Ecdytolopha insiticiana Zeller. Locust twig-borer gall. Fig. 84. 



Ecdytolopha insiticiana Zeller, Verh. Zool.-bot. ges. Wien, 1>7.">. v. 25, p. 266. 

 Packard, 5th rept. U. S. ent. eomm., 1890, p. 359-360. 

 Jarvis, 37th ann. rept. Ent. soc. Ontario, L906, p. 65, pi. K, fig. 2. 



Swellings of twig, somewhat sticky on surface, with hole at base, 

 through which castings fall. About 2 cm. long, 7-8 nun. thick. Larvae 

 leave the gall about Oct. 1, spin thin cocoons among leaves on the ground : 

 the moth emerges late in October. On common locust, Robinia pseudacacia. 



SAPINDALES. 



ANACARDIACEAE. 

 Rhus hirta. 

 Pemphigus rhois Fitch. Sumac tomato-gall. Fig. 87. 



Byrsocrypta rhois Fitch, Monti), journ. N. Y. agr. so.-, t. Aug., 1866, p. T:i. 

 Melaphis rhois Walsh, Proc. Ent. sot-. Phil., 1867, v. 6, i>. 282. 

 Pemphigus rhois Walsh and Riley, Amer. ent., 1869, \ . I, p. ins, fig. 89. 



Packard, Guide study ins., 1869, p. 524, fig. 523. 



Oestlund, Bull. 4, Geol. and nat. hist. suit. Minn., lss;. p. ■>:;. 



Beutenmiiller, Pull. Amer. mus. nat. hist., 1802, v. 4, p. -277, pi. lti, tig. <>; Ins 

 galls vicin. X. Y.,1904, p. 37-38, fig. 84. 



Lmtner, 12th rept. ins. X. Y. f. 1896, 1897, p. 290-292, pi. II. fig. 1. 



Cook, Ohio nat., 1904, v. 4, p. 140, rig. 113. 



Jarvis, 37th aim. rept. Ent. soc. Ontario. 1906, p. 65. 



A smooth, rounded hollow gall on the under side of the leaf, varying 

 greatly in size. Color yellow-green with orange and much red. Insects 

 fully grown in September. Not very common. On smooth sumac, Rims 

 glabra. Reported on Rhus hirta. 



Rhus glabra. 

 Pemphigus rhois Fitch. See above. 



Rhus radicans. 

 Eriophyes rhois, n. s. Poison ivy mite-gall. Fig. 88. 



Phytoptus, sp., Garmau, 12th rept. state ent. 111., lss:;. p 138. 



Eriophyes, sp., Cook, 29th ami. rept. Dept. geoi. and nat. res. Indiana f. 1904, 1905, p. 862. 



Jarvis. 37th ann. rept. Ent. soc. Ontario, 1906, p. 60, pi. A. fig. .">. 

 Without scientific name, Buckhout, Proc. Amer. assoc. adv. sci. f. 1882, 1883, v. 31, p. 476 



Eagen, Can. ent., lss;,, \ . IT, p. 28. 



Corrugations upon the upper and lower surfaces of the leaf of poison 

 ivy, Rhus radicans. These are pubescent with whitish hairs similar to 

 those upon other parts of the leaf, but more plentiful upon the upper sur- 

 face, and extremely so on the under side. The projections above are 

 raised more and somewhat constricted at the point of attachment, some- 

 what like the gall of Colopha ulmicola. 



CBLASTRACEAB. 

 Celastrus scandens. 

 Cecidomyia? celastri, n. s. Bittersweet root-gall. 



Irregular enlargement of roots of bittersweet, Celastrus scandens, some- 

 what pear-shaped. Polythalamous. 25 mm. long, 10 mm. greatest diam- 



