OAK GALL-FLIES. 107 
NEUROTERUS, Hartig. 
14f>. batata, Bass. (Cynips) Proc. Ent. Soc. Phil, iii, p. 684; Fitch, Fifth Rep. No. 
311. 
146. noxiosus, Bass. (Cynips) Can. Ent. xiii, p. 108. 
147. vesiculus, Bass. (Cynips) Proc. Ent. Soc. Phil, iii, p. 683. 
148. irregularis, O. S. (Cynips) 1. c. i, p. 65. 
149. verrucarum, O. S. (Cynips) 1. c. p. 62. 
150. minutus, Bass. (Cynips) Can. Ent. vol. xiii, p. 96. 
151. floccosus, Bass. (Cynips) 1. c. p. 111. 
152. affinis, Bass. (Cynips) 1. c. p. 103. 
153. piger, Bass. (Cynips) 1. c. p. 105. 
154. corrugis, Bass. (Cynijys)!. c. p. 109. 
155. majalis, Bass. (Cynips) Proc. Ent. Soc. Phila. iii, p. 683. 
156. rileyi, Bass. (Cynips) Am. Nat. 1881, p. 149; Am. Ent. vol. iii, p. 153 (figure 
of gall). 
157. crassitelus, Prov. Le Nat. Can. vol. xii, p. 232. 
158. minutissimus, Ashm. (Cynips) Proc. Ent. Soc. 1885, p. vii. 
159. confusus, Ashm. (Cynips) 1. c. 1881, p. xviii. 
160. coniferus, Ashm. (Cynips) 1. c. p. xxvii. 
The following species were characterized from the galls alone and their ge- 
neric position is uncertain : 
161. Cynips pilulae, Walsh Proc. Ent. Soc. Phila. vol. iii, p. 481. 
162. Cynips juglans, Osten Sacken 1. c. vol. ii, p. 256. 
163. Cynips cicatricula, Bassett, Can. Ent. vol. xii, p. 105. 
Division II.— Inquilin\e, or Guest Gall-flies.* 
PERICLISTIS, Forster. 
sylvestris, O. S. (Aulax) Proc. Ent. Soc. Phila. vol. iii, p. 37. 
pirata, O. S (Aulax) 1. c. vol. i, p. 64. 
futilis, O. S. (Aulax) 1. c. vol. i, p. 64. 
semipiceus, Harris (Cynips) Ins. Inj. Veg. p. 549. 
CEROPTRES, Hartig. 
ficus, Fitch (Cynips) Fifth Rep. No. 314. 
petiolicola, O. S. (Amblynotus) 1. c. vol. i, p. 67 ; vol. v, p. 380. 
Amblynotus ensiger Walsh, 1. c. vol. ii, p. 496. 
inermis, Walsh (Amblynotus) 1. c. vol. ii, p. 598; (Ceroptres) 1. c. vol. v, p. 380. 
arbos, Fitch (Cynips) Fifth Rep. No. 310. 
tuber, Fitch (Cynips) 1. c. No. 309. 
obtusilobse, Ashm. Trans. Am. Ent. Soc. xii, p. 301. 
citriformis, Ashm. 1. c. p. 300. 
pomiformis, Ashm. 1. c. p. 300. 
virentis, Ashm. 1. c. p. 300. 
succinipedis, Ashm. 1. c. p. 300. 
lanigerae, Ashm. 1. c. p. 301. 
minutissimi, Ashm. 1. c. p. 301. 
catesbaei, Ashm. 1. c. 301. 
SYNERGUS, Hartig. 
lignicola, O. S. Proc. Ent. Soc. vol. ii, p. 252; rhoditiformis Walsh 1. c. p. 499. 
oneratus, Harris (Cynips) Ins. Inj. Veg. 3d ed. p. 548; Fitch Second Rep. No. 
313; (Synergus) Osten Sacken 1. c. ante vol. v, p. 380. 
*As these are parasites on the other gall-flies, they are not numbered as injurious 
to the oak. 
