ACARIDEA. 
Arachn, 21 
cJieata aud A. atracheata, of which those names are sufficient explanation. 
To the latter, belong the true Acaridce, also Glyciphagus, Tyroghjphus^ 
Ehkoglyphus, Dermaliclius, Myocojdes, Listrophorus^ Histiostonia^ Pliy- 
toptiis^ Demodex, and the Sarcoptidie. The Tracheata are subdivided^ 
according to the position of the two spiracles, into six groups, Prostig- 
mata, Oribatidce, Gamasidoi, Ixodidtc, Tarsonemida (for Dendroptus^ 
Kramer, = Tarsonemus, Canestrini, 187G), and Myohiidoe. The Prostig- 
mata (also written Prostigmatki) comprise, as subfamilies, the Tromhi- 
diidoi {Tromhidium and Ottonia, g. n., p. 227), RliyncliolopliidcG {Ryncho- 
InpJius, Riiteria, aud Smaridia), Tetranychidcv {Tetranychus and Bryohia), 
Krythrcddai (Erythrams), Rhaphignatliidm (^Rhaphignathiis'), Tydcidm 
{Tydeus), Megameridoi {Scyphius, Penthaleus, and Eupodes, ? all = 
Megamerus) y Pacliygnathidcx {Pachygnatlius'), Ilydrachnidce (^Hydrachna), 
llygrohatidai (^Bperchon and Oxus, gg. nn., p. 240, also Diplodontus, 
Arrkenurus, Aturus, Axo??a, A tax, Midea, Uydrochor elites, Nescea, and 
Liranesid), Eylaidce (Eylais), Limnocliaridoi (Limnochares), Bdellidce 
{Bdella, Scirus, and Linopodes), aud Cheyletidce {Cheyletus [? rectius Che- 
lytus vel. CheleutiisJ). 
Dcndroptus galls are not separable from those of Phyioptus j RhapJii- 
gnathiis ruherrimue has decided abdominal segmentation ; and observa- 
tions on the spinning power of Erytlirccus parietiniis : id. 1. c. pp. 55 
& 5G. 
ORTBATlDiE. 
Iloplophora ferruginea, C. F. George, Sci. Goss. 1877, p. 205, figs. 
162-164, England. 
GAMASIDd]]. 
AntennopJiorus, g. u., G. Haller, Arch. f. Nat. xliii. p. 57. For A. 
uhlmanni, sp. n., p. 68, pi. v. figs. 1-5, parasitic on Formica nigra. 
Gamasus quadripunctatus. Old Calabar, and G. (?) podager, no locality 
mentioned, spp. nn., A. Murray, Economic Entomology \_suprd, p. 4], 
p. 161, figs. 
Xfropoda americana., sp. n., C. V. Riley, P. Am. Ass. xxv. (Buffalo, 
1876), 1877, pp. 273-275, fig., with special observation of an extensile 
penetrating organ, homologous with the maxillae, and enabling the mite 
to retain its hold on rupture of the excrementitious connecting anal fila- 
ment. These appear to be the “ Scheerentiister ” of Kramer, Arch. f. 
Nat. xlii. pt. 1 . 
IXODIDAS. 
XipUiastor, g. n., Murray, 1. c. p. 201. Between Adenopteura and 
A mhlyomma : “ flat, mouth provided with a long projecting rostrum and 
long palpi applied to it, abdomen with posterior margin beaded.” For X. 
rostratum, sp. n., ibid, fig.. Old Calabar. 
Ophiodes [Guenee, Lepidoptera, 1841], g. n., id, 1. c. p. 203. For 
Acarus opTiiophiliis, Mlill., and other snake-mites. 
Argas moubata, sp. n., id. 1. c. p. 182, fig., Angola. 
