ENTOMOLOGICAL INTELLIGENCE, ETC. 159 
MonoGraruHia ANOPLURORUM BRITANNL#; or an Essay on the British species of 
Parasitic Insects belonging to the order Anoplura of Leach, with the modern 
divisions of the genera according to the views of Leach, Nitzsch, and Burmeister ; 
with highly magnified figures of each species. By Henry Denny. Author of 
‘‘Monographia Pselaphidarum et Scydmenidarum Britannie,’’ &c. London. 
Henry G. Bohn, 1842. 8vo, 286 pages, and 26 plates. 
Mr. Denny, so well and advantageously known by his illus- 
trated work on the British Pselaphidee and Scydmenidz has, 
in this work, published a beautiful series of more than 200 highly 
magnified coloured figures, with descriptions and notices of 248 
species of lice found in this country, one half of which at least are 
now for the first time made known to naturalists. 
The excellent manner in which the work is executed, has led to 
a request on the part of the British Association, that he will also 
illustrate the exotic species of the group. A few remarks upon the 
introductory portion of the work will not, however, be irrelevant. 
Mr. Denny states that the opinion that each and every animal has 
its own peculiar parasite isnot borne out by facts; thus Docophorus 
icteroides is found on nearly every species of duck which has come 
under the author’s notice. On extending our observations to genera, 
we find them take a wider range; and it is in only two or three 
cases that it could, with any confidence, be asserted that they were 
diagnostic of certain families of Vertebrata. Itis easy to say whether 
they belong to quadruped or bird, but more difficult to pronounce 
the peculiar family of either, as some genera of each division appear 
perfect cosmopolites; thus, Pediculus infests man, Quadrumana 
Rodentia, Carnivora, Pachydermata and Ruminantia; Nirmus 
mfests every order of birds except the Gallinacea: Docophorus 
all but Gallinacea and Columbide ; Lipeurus infests the orders 
Gallinacea, Grallze, Palmipedes, and Accipitres: whilst a few on 
the other hand are nearly certain indexes to the families; Eureum 
being only found on Chelidones; Trinoton only on Palmipedes ; 
Goniocotes and Goniodes only on Gallinacea and Columbidee ; 
Gyropus only on the Guinea pig in this country ; and Phthirus only 
onman. Mr. Denny has not made any observations on the oceur- 
rence of several distinct species, and even genera, upon the same 
animal. 
The extent of the variations of form at different ages in these 
insects, has not received the attention which it merits; indeed 
Mr. Denny’s observations hereon in pages xii. and xvii. are some- 
what at variance with each other. This is a point the more neces- 
