264 Ins. 
NEUROtTERA. 
New species : — 
Ccecilius corsicus , Kolbe, Ent. Nachr. viii. p. 209, Corsica ; perlatus , 
p. 210 (= obsoletus , id. var. olim ); piceus, p. 210, Saxony ; pilosus , Hagen, 
S. E. Z. xliii. p. 283, pi. i. fig. 3 (in amber). 
Peripsocus parvulus, Kolbe, l. c. p. 211 (= alboguttatus, id. var. olim'). 
Psocus japonicus, id. 1. c. p. 209, Japan ; fumigatus, id. S. E. Z. xliv. 
p. 81, pyralinus, ibid., and pictiventris, p. 83, Brazil; heteromorphus , 
Bertkau, Arcli. f Nat. xlix. p. 98, pi. i. fig. 1, Rhenish Prussia (= Neo- 
psocus rhenanus , Kolbe). 
Atropos sericea , Kolbe, S. E. Z. xliv. p. 86, Silesia; succinica , Hag.,/, c. 
xliii. p. 289, pi. ii. fig. 3 (fossil in amber). 
Empheria villosa , Hagen, Z. c. p. 221, pi. i. fig. 9 (fossil in amber). 
Peru da?. 
Perla ferreri , Piet., rediscovered in the Yal Anzasca, the ? described ; 
McLachlan, Ent. M. M. xix. p. 109. 
Ephemeridje. 
Eaton, A. E. An announcement of new genera of the EpTiemeridce. 
Ent. M. M. xviii. pp. 207 & 208. [Supplementary, cf. Zool. Rec. 
xviii. Ins. p. 263.] 
Y AYSSitiRE, Albert. Recherches sur l’organisation des Larves des 
Eph6m6riens (These presentee a la facultee des sciences de Paris 
pour obtenir le grade de docteur en sciences naturelles). Ann. Soi. 
Nat. (6) xiii. pt. 1, pp. 1-137, pis. i.-x. 
The most important memoir on the subject that has yet appeared, 
divided conveniently into six chapters, of which chap. i. is occupied by 
a critical bibliography ; ii. treats on the general morphology and 
organs of respiration, and is the most important of all ; iii. deals 
with the circulatory system ; iv. with the digestive ; v. with the 
nervous ; and vi. concerns parasites. In Chap. ii. the author recog- 
nizes five subdivisions: — (1) Those larvae in which each external 
respiratory organ forms a plate furnished with a fringe of long tubes, 
or filaments, all round ; in this subdivision the genera Leptophlebia , Pota- 
manthus , and Polymitarcys are considered. (2) The respiratory appara- 
tus lamellate, without any trace of marginal filaments ; comprising 
Oniscigaster , Centroptilum, and Cloeon , with the addition of Cloeopsis , 
originally proposed by Eaton for C. dipterum, and afterwards abandoned, 
but which the author thinks should be maintained. (3) The apparatus 
consisting of a “ protecting ” lamina, at the base of which is a tuft of 
filaments, or a double bunch of very delicate filaments ; in this sub- 
division come such genera as Heptagenia , Oligoneuria , Jolia , and Ephe- 
merella. (4) In Ccenis and Tricorythus the second pair of branchiae form 
“ protective ” organs covering all the other pairs ; the first pair atrophied. 
(5) Here the apparatus is completely concealed and protected by the 
mesothoracic development ; comprising Baitisca and Prosopistoma. All 
