NEPIDiE. 
433 
Nepid^e. 
Belostomides. 
Mayr (Verli. z.-b. Wien, xxi. pp. 399-440) monographs this group, cha- 
racterizing one new genus and 6 new species, and tabulating, by their larvae 
and pupae, such of the genera as are known to him in those stages. He de- 
preciates Dufour’s work on these insects. The following observations 
occur : — 
SerpkuSf StSl (1862), apparently requires renaming, Seijyhus having been 
used by Schrank in 1780 and Haliday in 1832. Stenoscytns mcxicanus, Mayr, 
= Ahedus ovatns, StSl. Belostoma testacp.opallidum, Lntr., is possibly a Zaitha. 
Z. indentata, Hald., == Am. & S. ; stolli, Mayr,=crt;*&oMana, Duf.,= 
marginiguttata^ Duf. ; dentata, Mayr, = eMmo> 7 ?Aa, l)uf. ; stolli, Duf., pt.= 
6osc?V, II.-S., Y,—anurus, II .-S., of which cupreomicans, StSl {suhspinosa, 
Duf., ? hifoveata, Hald.), is a var. ; stoUi, Duf., pt. = asiatica, Mayr, for which 
hoops, Duf., is to be used, the species not coming from Asia [!] ; reticulata, 
ll?\A, = testacea, Leidy ; a var. of minor, Duf., is named cuhensis, p. 417 ; 
macidosa, limhata, adusta, difficilis, and ? micantula, Duf., = jyleheia, StSl ; 
doubt is thrown both upon the specific value and the Pondicherry locality of 
pygmcea, Duf. Arnorgius, St., is not generically distinct from Belostoma ; B. 
medium and curtum, Gu^r., are irrecognizable ; Lethocerus cordofanus, Mayr, 
Belostoma liitescens, indicum, hispimdosum, pruinosum, Duf., patruele, St., 
= niloticum, St. ; ritficeps and signoreti, Duf., = annulipes, H.-S. ; ohscurum and 
litigiosum, Y)\x{.,ira2Jressum, Hald., var. americanum, Leidy,=/ 7 rjse?/m, 
Say ; distinctum and rujiceps, var., Duf., harpax, St., and ? angustatum, Gu^r., 
^Benacus haldemanus, Leidy. B. grande, Luc., algei'icnse, Duf., capitatum, 
Guer., Ilyotrephes herculeus, Duf., Hydrocyrius punctatus,Si^\, = H.columhice, 
Spin. Borhorotreplies Jiedenhorgi, ^t.,=Limnogeton Jieheri, Mayr. Appasus, 
Am. & S., and Amyotella, Spin., are possibly identical, the former having been 
wrongly confused with Diplonychus by Dufour ; AJaponicu^,Ym\\.., is probably 
to be referred to the latter genus; A. natator, Am. & S., Diplonychus cegyp- 
iius, H.-S., and ccenosus, ^\,.,—nepoides, F. ; A. natator, St., nee Am. & S., is 
renamed capensis, and Dipl, luridus. Germ., but for its locality, would seem 
referable to this species, instead of to nepoides. Atomia, ^^m.,=8pharodema. 
Lap., 1832; Belostoma marginatum. Gray, 8. rotimdata, annulata, F. 
Nervinops, = Diplonychus, Am. & S. {7iec Lap.) ; a var. of molestus, Duf., 
is named suhrhomhetis, p. 437 ; marginicollis, Duf., is considered a var. of rus- 
ticus, F., with which Nepa plana, Sulz., is probably identical. 
The following new genus and species are described : — 
Nectocoj'is, p. 432. Allied to Zaitha, but with deep and back ward ly con- 
verging interocular furrows, the lateral margins of pronotum straight and 
slightl}^ dilated, the outer margin of hemelytra strongly arched and fiattened, 
the membrane complete, but small, and the two claws of anterior tarsi not 
abbreviated. N. stali, ibid., Pangoon. 
Ahedus sigiioreti, p. 404, Mexico and Guatemala ; vicinus, p. 405, Mexico. 
Zaitha elegans, p. 415, La Plata. 
Belostoma aheri-ans, p. 424, India ; angustipes, p. 427, Mexico. 
2 G 
1871. [voL. VIII.] 
