13i Transactions of the Royal Microscopical Society. 
which two or three specimens were found on the ear of a naval 
officer, near Newfoundland. It appears doubtful whether this is 
different from Eruditus. The late Andrew Murray says that the 
armature of the palpi appears to be different, but does not say in 
what respect ; the difference may possibly be due to imperfect 
drawing^ or preservation. 
An account of the mouth, tracheae, &c., is given by Dujardin.* 
Johnston t mentions it, and writes upon Eruditus. 
Kirby and Spence J (on the authority of Schrank, but still it 
would seem erroneously) state that the larva has eight legs. 
Mr. Brady § found a specimen in the sea, and called it Rohert- 
sonv; it appears, however, to have been Eruditus. 
Mr. Beck kept and bred Eruditus, 1| the name of which he does 
not give, and treats of the phenomenon of parthenogenesis with 
regard to it ; but he expressly says that he did not find the male, 
and he does not describe the larva. 
dliere is a most exhaustive description of the anatomy and 
physiology of Eruditus given by Bobin and Fumose ; Tl they, 
however, expressly say that they have not found the perfect sexual 
state, but only the larva and nymph. They say that the perfect 
state is unknown, and this is repeated by M. Eobin in 1877, ** but 
they appear not to have observed Mr. Beck’s paper and indeed 
expressly say that they are not aware that anyone has treated of 
the subject since Koch. 
Finally, Andrew Murray, in his ‘ Economic Entomology,’ gives 
the genus with reference to Koch, Kobin, &c., and a drawing which 
he marks as being the male copied from Eobin. It appears to be a 
copy of Robin’s plate xxii., fig. 2 ; but Eobin expressly says he has 
not found the sexual form, and Murray does not explain why he 
calls it the male. 
Generic Characters. 
These are: — 
1 . The rostrum, large, sharp, and adapted for sucking. 
2. The enormous palpi of three joints, armed with falces and 
pectinated cirri or styles, forming predatory weapons, and being by 
far the most conspicuous characteristic. 
3. The fiattened diamond-shaped body with truncated ends. 
4. The legs having five joints, the tarsal being terminated by 
two claws with a double claw between them, and being furnished 
with a sucker or else fine hairs on the double claw like a brush. 
* ‘ Comptes Kendus,’ 1844, xix. 1160. 
t * Transactions of Berwickshire Naturalists’ Field Club,’ vols. ii. and iii. 
X ‘ Intro, to Entom.,’ vol. iii. p. 107. 
§ ‘ Proc. Zool. Soc.,’ 1875. 
jl ‘Micro. Trans.,’ 1866, p. 60. 
^ ‘Journal de I’anatomie et de la physiologic,’ 1867, t. iv. p. 506. 
** ‘Traite du Microscope,’ 12th ed., Paris, p. 691. 
