584 
ZOOLOGICAL LITERATURE. 
characterizes the genus Passaleutus (Am. & Serv.), which he regards as most 
nearly related to Plaeoffaster, 1. c. p. 67. j 
Harpagocoi'is obscuricrusj sp. n., Sttl, 1. c. tome iv. p. 67, from Caffraria. 
Sycamis generosuSy sp. n., Stil, 1. c. p. 68, and Sycanus pyrrholomuSy sp. n., 
StSl, ibid., from Manilla. 
Zelides. 
Stal, /. c. p, 69, describes Ploiaria acanthifera (Mont.) under the corrected 
name of Saica acanthophora. 
Atrachelm curvidenSy sp. n.. Sign. 1. e, p. 680, from Chili. 
Holotrichiides. 
Petalocheirus australisy sp. n., De Vuillefroy, Ann. Soc. Ent. 4® serie, tome iv. 
p. 142, pi. 1. fig. 9, from Malacca ] P. apetaluSj sp. n., De Vuillefroy, ibid., 
pi. 1. fig. 10, from Malacca. 
Emesides. 
Emesella dohrniy sp. n.. Sign. 1 . c. p. 687, from Chili. 
HYDROMETRIDiE. 
Hydrometra servilleiy sp. n. (Meyer), Frei-Gessner, Mitth. Schweiz, ent. 
Ges. 1864, p. 228, from Switzerland. 
Galgulid^e. 
Mononyx parvulusy sp. n.. Sign. Ann. Soc. Ent. Fr. 4® sdr. tome iii. p. 688, 
from Chili. 
Nepidas. 
Lucas remarks (Ann. Soc. Ent. Fi\ 4® s6r. tome iv. p. 219) that Belostoma 
algeriense (Duf.) belongs to Hydrocyrius (Spin.), with which Ilyotrephes 
(Stal) is synonymous. lie adds that, in the opinion of L. Dufour, Ilyotrephes 
herculeus (St°l) is identical with Hydrocyrius columhice (Spin.) and also with 
Belostoma algeriense (Duf.). Lucas also considers the species to be perhaps 
identical with B. grandcy and it has been described, under the name of B. 
cosmopolitanumy by Coinde in the Rev. et Mag. de Zool. 1863. 
Leon Dufour (1. c. p. 221) corrects some errata in his ^Essai sur les B^lo- 
stomides,’ and notes that Limnegeton (Mayr) is synonymous with Borboro- 
trephes (St^l). 
Signoret (/. c. pp. 222-226) remarks upon the characters of the genus 
Diplonychus (Lap.), and indicates that that genus is imperfectly charac- 
terized, and that it is a question what its real type is. Signoret agrees 
Tvith Lucas and Dufour in regarding Belost. algeriensCy B. grande, Hy- 
drocyrius columbicBy and Ilyotrephes herculeus as identical, but is doubtful 
whether B. cosmopolitdnum (Coinde) belongs to the same species. Signoret 
also maintains, in opposition to L. Dufour and Lucas, that the rostrum in the 
BelostomidcB is composed of four joints, the third joint being very short and 
only visible on the upper surface of the rostrum, as described by L^on Dufour 
in 1865 in the Mem. de I’Acad. Roy. de Liege. 
Belostoma deyrolliy sp. n., De Vuillefroy, Ann. Soc. Ent. Fr. 4® s6r. tome iv. 
p. 141, pi. 1. fig. 6, from Japan. 
Appasus japonicuSy sp. n., De Vuillefroy, 1. c. p. 141, pi. 1. fig. 7, fi'om 
Japan. 
