394. 
ZOOLO(HCA L LITE RATU RE . 
difficulty; others may easily be settled; and some lie would never 
have put forward had he not confined himself to the consideration 
of the European forms and their literature. The adoption of the 
Linnean name Cimex for the genus including C. lectularius 
(Linn.) may be defensible as a matter of convenience^ and upon 
the ground of its having been the ancient name of the Bed-bug, 
but, as pointed out by Douglas and Scott, in their reply to Pascoe, 
C. lectularius can never be regarded upon scientific grounds as 
the type of a group characterized as is the Linnean genus Cimex. 
Cydnus is said by Pascoe to be discarded by Douglas and Scott, 
but erroneously. Those authors doubtless followed the Recorder 
in limiting the genus Cydnus to the form typified by C. tristis 
(Fab.), which is indicated by Fabricius himself as his type ; and 
as that species was not known to occur in Britain, they could not 
refer to it. Tetyra (Fab.), being strictly synonymous with Scu- 
tellera (Lam.), has been dropped by many authors ; its Fabrician 
type is T. arcuata ; and Stal has adopted the name for this spe- 
cies, placing it close to Pachycoris. The confusion with regard 
to the genus Asopus might have been avoided had it been borne 
in mind that the genus was originally published by Burmeister 
in the ^Nova Acta,^ with Lyg(eus aryus (Yah.) =maclans (Fab.) 
as its sole species. As regards the common substitution of Hy- 
drometra for Gerris, Pascoe is unquestionably right. The 
desirability of creating new names for genera compounded of 
two or more older ones, a practice to which Pascoe also objects, 
is very doubtful; it is strongly maintained by Douglas and 
Scott, against whom Pascoe^s animadversions upon it are more 
particularly directed. 
Planchon, J. V. Nouvelles observations sur le Puceron de la 
Vigne [Phylloxera vastatrix [nuper Rhizaphis, Planch.]). 
Comptes Rendus, tome Ixvii. pp. 588-594. 
Scott, John. (See Douglas, J. W.) 
Shimer, Henry. On a new genus of Aphidse. Trans. Amer. 
Ent. Soe. vol. i. pp. 283-285 : October 1867. 
. Notes on the Apple Bark-Louse,^^ Avith a description of 
a supposed new Acarus. Ibid. pp. 361-374 ; January 
1868. 
SiGNORET, V. Essai sur les Cochenilles ( Homopteres- Cocci des). 
Annales Soc. Ent. France, 4® serie, tome viii. pp. 503-528 
and 829-876, pis. 9-11. 
. Essai monographique sur les Aleurodes. Ibid. pp. 369- 
402, pis. 9-10. 
Stal, C. Hemiptera Fabriciana. Fabricianska Hemipterarter, 
efter de i Kopenhamn och Kiel forvarade Typexemplaren 
