1896.] Entomology. 839 
bastardized, that theory being that unripe ova are partially impreg- 
nated by the spermatozoa of the foreign male, not sufficiently to fully 
vivify them, the influence of this impregnation affecting only the epi- 
blast, from which the skin is evolved, and a subsequent fertilization 
- brings full life to the ova, determining other features of the foetus. Thus, 
in the case of a pug bitch, which had a mongrel litter by a Skye terrior, 
and at her subsequent whelping by a pug dog, had some puppies with 
rough hair, these “influenced” puppies had the conformation of the 
pug all over, even to the twisted tail. 
However, be the scientific part of the question what it may, the too 
common idea that a bitch having a mongrel litter will show influence 
of that litter in all future offspring, is utterly fallacious. 
Yours truly, W. WADE. 
Oakmont, Pa., Sept. 14, 1896. 
ENTOMOLOGY. 
A New Character in the Colobognatha, with Drawings of 
Siphonotus.—In all known Diplopoda the external seminal aper- 
tures are located just behind the second pair of legs or in the coxæ of 
the second legs. In all Diplopoda except Polyxenus one or more 
pairs of legs are more or less modified to assist in copulation. In a 
great majority of forms the legs most modified are those of the seventh 
segment, but in two groups, the Omniscomorpha and Limacomorpha 
of Pocock the legs of the seventh segment are unmodified, while one or 
more pairs at the caudal extremity of the body are transformed into 
copulatory organs. The modification which has taken place in the 
Limacomorpha is very slight, for according to Mr. Pocock’s deserip- 
tions and figures the last legs of Glomeridesmus marmoreus? consist of 
four or five joints and differ from the others mostly in being shortened 
and thickened. An equal or greater degree of specialization is now 
known to exist in other legs than those of the seventh segment, indeed, 
an almost equal peculiarity of structure is sometimes manifested by 
nearly all the male legs of certain genera of Polydesmide, Spirostrep- 
tide and Spirobolide. Especially noteworthy are the first pair of legs 
in Iulide, Parajulidee and Peeromopodide ; the second pair of legs of 
Stemmatoiulide and Parajulids ; the third pair in Striariide. With- 
1 Edited by Clarence M. Weed, New Scr College, Durham, N. H. 
2 Journ. Linn. Soe. ape XXIV, 4 
