154 THE ENTOMOLOGIST. 
Thickened marginal rolls of leaf of Tilia Huropea. Metamorphosis 
external. 
TORNATELLA, Bremi (undescribed). Trail, Trans. N. H. §., Aberdeen, 
1878, p. 75. © Figured, Bremi, pl. i., fig. 13. 
Small rifle-bullet-like galls on upper side of leaf of Magus sylvatica. 
Metamorphosis internal. 
TREMULH, Wtz. (Dieuosis). Walker, I. B. in. 114. Figured, Bremi, 
pl. i., fig. 14; F. Low, Verh. z.-b. Gesell. Wien. xxiv., pl. 1, 
fig. 10. 
Leaf and leaf-stalk of Populus tremula. Metamorphosis external. 
rrirotn, I”, Low. (Cecrpomyia). Trail, Scot. Nat. 1. 195. Figured, 
F. Low, Verh. z.-b. Gesell. Wien. xxiv., pl. i, fig. 4. 
Folded leaflet of Trifolium pratense and 7’. repens. Metamorphosis 
internal. 
uuicis, Trail (AspHonpyu1a). Scot. Nat. ii. 172; and Trans. N.H. 6&., 
Aberdeen, 1878, p. 58. Verrall, Ent. Mo. Mag. xi. 224. 
Inflated flower-bud of Ulex Huropeus. Metamorphosis internal. 
unmariz, Br. (Cecrpomyra). Walker, I. B. iii. 88. Kidd., Ent. Mo. 
Mag. iv. 238. Figured, Bremi, pl. i., fig. 15. Ormerod, 
Entom. xi. 12. 
Leaf of Spirea ulmaria, Metamorphosis internal. 
umBeLLataRuM, F’, Léw (AspHonpyuia). Verh. z.-b. Gesell. Wien. 
xxvu. 381. See A. pimpinella. 
urticm, Perris (Cectpomyta). Walker, I. B. iii. 89. Miller, Ent. Mo. 
Mag. vi. 187. Figured, Swammerdam, pl. 45, figs. 2-5; and 
Perris, Ann. Soc. Ent. Fr., vol. ix. (1840), pl. xi., 1. 
Leaf and stem of Urtica dioica. Metamorphosis external. 
veronicm, Vallot (Cecrpomy1a). Haliday, Ent. Mag. iv. 147. Inch- 
bald, Ent. W. Int. vii. 196. Figured, Bremi, pl. i, fig. 28. 
End of leaf of Veronica Chamedrys. Metamorphosis internal. 
HYBRIDS AND DEGENERACY. 
By ALFrrRep WaAILLY. 
(Membre-Lauréat de la Société d’Acclimatation de Paris.) 
Havine received several communications on the subject of 
hybrid species, the last being from Herr L Huesmann, I will 
state the little I know, and the few facts which have come under 
my notice. 
As is well known, hybrids have been obtained by the crossing 
of Smerinthus ocellatus with S. populi; also by the crossing of the 
different species of Saturnia: pyri, spini, and carpi; Pavonia- 
major, Pavonia-media, Pavonia-minor. Hybrids have also been 
obtained by the crossing of the: oak-silkworms, Attacus Yama- 
Mai and A, Pernyi. These hybrids are certainly very interesting 
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