332 ZOOLOGICAL LITERATURE. 
Selys-Longchamps, E. de. Note sur uiie Excursion dans 
TE litre- Sambre et Meuse. Ann. Soc. Entom. Belg. tom. vii. 
pp. 47-51. 
This note contains lists of the Diurnal Lepidoptera and Libe- 
lulidce captured by M. de Selys-Longchamps in the neighbour- 
hood of Chimay and Mariembourg. 
Walsh, B. J. On Phytophagic varieties and Phytophagic 
species. Proc. Entom. Soc. of Philadelphia, vol. iii. pp. 
403-430. November 1864. 
In this interesting and valuable memoir Walsh calls attention 
to the bearing upon the hypothesis of the origin of species by 
evolution of some well-known facts in the history of insects. 
The circumstance to which he refers is, that whilst many species 
seem to be exclusively confined to a single food-plant, others 
are more discursive in their tastes, feeding not only upon one or 
tAVO nearly allied plants, but often upon plants belonging to 
widely separated groups ; and that correlated with this, if not 
caused by it, we often find certain differences in the insects, 
either in the larval or perfect state. When these different forms 
interbreed, they may be regarded as belonging to the same 
species, and are then called by the author Phytpohayic varieties ; 
these if isolated, owing to only one species of the food-plants of 
their species being accessible to them, may become Phytophagic 
races ; and these, again, by the continuance of their condition of 
segregation, may originate Phytophagic species, Avhich Avould be 
either averse to, or incapable of, interbreeding. The production 
of such varieties and species will be most common in those 
Phytophagous forms of which the imago is destitute of Avings, 
or has but little power of flight : as examples the author cites 
Cynips and its allies, Cecidomyia, Aphis, Coccus, and Tingis. Of 
the latter genus he describes two neAV (Phytophagic) species, and 
of the Orthopterous genus Diapheromera, a new species allied to 
D. femai'ata. His remarks upon species and varieties refer to 
Halesidota [Lophocampa) antiphola (Walsh), H. (L.) tessellaris 
(Smith), H. (L.) caryce (Harris), Clytus pictus (Drury), C. ro- 
hinice. (Porst.), Sphingicampa distigma (Walsh), and Dryocampa 
bicolor (Harris), Bombyx mori, Haltica alternata (Ilk), Da- 
tana minislra (Drury), Chrysomela scalaris (Lee.), Cynips q. 
spongifica (O. S.), C. q. inanis (O. S.), C. q. punctata (Bassett), 
O. q. podagra (Walsh). In this memoir Walsh has opened up 
to entomologists a course of investigation which may lead to 
most important results, but which must be pursued Avith the 
greatest caution. 
Walsh, B. J. On certain Entomological Speculations of the 
New England School of Naturalists. Proc. Entom. Soc. 
Philad. vol. iii. pp. 207-240. August and September 1864. 
