96 Proceedings of the Royal Physical Society. 
Scottish students should consult the following interesting series of 
papers :— : 
155. Trait, J. W. H.: Scottish Galls. Scot. Nat., vol. i. pp. 123-125, 156-159, 
192-197, 234, 235 (1871-72) ; vol. 11. pp. 30-32, 78-80, 170-173, 251-254, 
301-305 (1873-74); vol. iv. pp. 18-18, 168-170 (1877-78) ; vol. v. pp. 
213-217 (1879-80); vol. vi. pp. 15-20, 255-257 (1881-82); N.S. vol. 
i. pp. 206-216 (1883-84); vol. ii. p. 250 (1885-86); vol. iii. pp. 107-_ 
110 (1887-88) ; vol. iv. pp. 226-232 (1889-90). 
156. Trait, J. W. H.: New Scottish Galls. Ann. Scot. Nat. Hist., 1892, 
pp. 264-266. ; 
157. Trai, J. W. H.: The Gall-making Diptera of Scotland. Scot. Nat., N.S., 
vol. iii. pp. 281-288, 309-328, 373-382 (1887-88). (In this paper 
references are given to previous records of the occurrence of Galls. 
in Scotland.) | 
Hessian Fry (Mayetiola destructor). For information concerning this, 
the most important member of the Family, the following may be consulted:— 
158. Kirpy, WILLIAM: Some Account of the Hessian Fly (Cecidomyia 
destructor). Loudon’s Mag. Nat. Hist , vol. i. pp. 227-228, figs. (1829). 
159. ORMEROD, ELEANOR A.: The recent Appearance of the Hessian Fly, 
Cecidomyia destructor, in Great Britain. Journ. Roy. Agric. Soc. (2), 
Xxli. pp. 721-727 (1886). 
160. WHITEHEAD, C.: Official Reports on the Hessian Fly. Journ. Roy. 
Agric. Soc. (2), xxii. pp. 727-729 (1886). 
161. OrmMEROD, ELEANOR A.; The Hessian Fly in Great Britain. London, 
1886. 
162. FrEAM, W.: On the Hessian Fly, or American Wheat-midge, Cecidomyia 
destructor, and its Appearance in Britain. Rept. British Assoc., 1887, 
pp. 767-768. 
168. CAMPBELL, F. MAuLe: The Hessian Fly. Trans. Hertf, Soc., iv. pp. 180- 
192 (1887). 
164. ORMEROD, ELEANOR A.: Cecidomyia destructor, Say, in Great Britain. 
Trans. Ent. Soc. Lond., 1887, pp. 1-6, woodcuts. 
165. ORMEROD, ELEANOR A.: The Hessian Fly and its Introduction into 
Britain. Trans. Hertf. Soc., v. pp. 168-176 (1889). 
166. Enock, F.: The Life-history of the Hessian Fly, Cecidomyia destructor, 
Say. Trans. Ent. Soc. Lond., 1891, pp. 329-366, pl. xvi. 
167. The Hessian Fly (Cecidomyia destructor). Bd. of Agric. Leaflet, No. 125 
(Dec. 1904; revised Feb. 1907). 
