PSOCIDiE ODONATA. 
393 
Psocus pedicularis, Rambur (nec L.), renamed ramburi, p. 146 (fore-wing 
figured) . 
Hetnipsocus, g. n., id. I. c. p. 146. Allied to Psocus (restricted), but with 
only 3 cellules on the inner margin. Type P. chloroticus, Hag. (fore-wing 
figured). 
Psocus 5-punctatus and clarus, Ceylon, malayanus, Sula : M'Lachlan, I. c. 
p. 76, spp. nn. 
Cacilius pictipennis, sp. n., id. I. c. p. 76, Ceylon. 
Perlid^e. 
Pteranarcys reticulata, Burm. M'Lachlan redescribes this insect, and 
figures the abdominal characters of (5* $ . Ann. Ent. Belg. xv. p. 51, pi. i. 
figs. 2 & 3. 
Dictyopteryx dichroa, id. /. c. p. 52, pi. i. figs. 4 & 5, and D. compacta, I. c. 
pi. i. figs. 6 & 7, Siberia : spp. nn. 
Perla Jlavitincta, id. /. c. p. 54, pi. i. fig. 9, and P. exilis, I. c. pi. i. fig. 8, 
Siberia : spp. nn. 
EPHEMERIDiE. 
JoLY, N. & E. Etudes sur le pretendu Crustace an sujet duquel 
Latreille a cree le genre Pi'osopistoma, et qui n^est autre 
qu'un veritable insecte hexapode. Ann. Sci. Nat. (5) xvi. 
no. 7, pp. 1-16^ pi. 3. 
This very important article contains an amplification of the views already 
promulgated by E. Joly (c/. Zool. Kec. viii. p. 406), that Latreille's sup- 
posed genus of branchiopod Crustacea, termed Prosopistoma, is the immature 
condition of an insect pertaining to this family. The fact that the animals 
breathe by means of tracheae is almost conclusive evidence that they are true 
insects ; but it is difficult to imagine what the imago can be like for no 
European species yet discovered offers any analogy in the enormous thoracic 
development. Prosopistoma had never been thoroughly accepted by crusta- 
ceologists ; and it now rests with entomologists to follow up the clue given 
by the authors of the above-quoted article, and, which ought not to be diffi- 
cult, to prove the position they assign to the genus with so much show of 
probability. 
Westwood, Proc. Ent. Soc. 1872, p. vi, remarks on types of Prosopistoma 
rom Madagascar. 
Palingenia sihirica, sp. n., M'Lachlan, Ann. Ent. Belg. xv. p. 50, pi. i. 
fig. 1 (details), Siberia. 
Odonata. 
Cabot, Louis. The immature state of the Odonata. Part i. 
Subfamily Gomphina. Illust. Cat. Harvard College, no. 5, 
pp. 1-17, pis. i.-iii. 
Selys-Longchamps, E. de. Note sur plusieurs Odonates de 
Madagascar et des iles Mascareignes. R. Z. 1872, 
pp. 175-182. 
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