26 Arachn, 
AtfACHNIDA. 
Cheyletus heteropalpus, p. 242, C. parasitivorax, p. 241, pi. xxii., C. 
macronychus, p. 243, M(^g., described ; P. M4gnin, 1. c. 
Harpirrhyncus nidulans, M^g., = Sarcoptes undulans, Nitsch P ; id. 1. c. 
p. 244, pi. xxiii. 
HyDRACHNIDJ]. 
Neuman, C. J. Om Sveriges Hydrachnider. Sv. Ak. Handl. (n. f.) xvii. 
No. 3, pp. 1-123, pis. i.-xiv. 
Treats (pp. 1-16) on the literature of the family, and (pp. 16 & 17) the 
anatomy, &c., and then describes 72 species, belonging to 20 genera, 5 
of which and 23 of the species are new. The species are distributed as 
follows : — A tax, Fabr., 5 ; Nesoea, C. L. Koch, 21 (10 new) ; Fiona, Koch, 
5 (3 new) ; Hydrocheutes, Koch, 3 ; Hygrohates, Koch, 2 (1 new), g. n. ; 
Megapus, 1 (sp. n.) ; Midea, Bruzelius, 1, g. n.; Mideopsis, 1 (sp. n.), 
g. n. ; Lihertia, 1 (sp. n.), g. n. ; Fseudomarica, 1 (sp. n.), Marica, C. L. 
Koch, 1 ; Axona, Kramer, 1 ; Arrhenurus, Kram., 14 (5 spp. nn.) ; 
Anurania, g. n., 2 ; Limnesia, C. L. Koch, 4 (with descriptions of the 
larvae of 3 others, in second stage) ; Eylais, Latr., 1 ; Diplodontus, 
Dugins, 1 ; Hydrachna, Muller (0. L. Koch), 2 ; Hydrodroma, C. L. Koch, 
1 ; Bradypates, Neum., 1. 
Nescea mirabilis, p. 31, pi. iii. fig. 3, N. despiciens, p. 32, N. alpicola, 
p. 37, N. hrevipalpus, p. 38, N. decor ata, p. 39, pi. viii. fig. 1, N, specta- 
bilis, p. 40, pi. xii. fig. 4, N. borealis and N. alpina, p. 44, N. brevipes, 
p. 49, pi. ii. fig. 3, and N. unguiculata, p. 50, pi. v. fig. 3, spp. nn., id. 1. c., 
Sweden. 
Fiona lapponica and F. mura, p. 55, pi. ii. fig. 1, and P. abnormis, p. 56, 
pi. viii. fig. 3, spp. nn., id. 1. c., Sweden. 
Hygrobates impressus, sp. n., id. 1. c. p. 63, pi. iv. fig. 4, Sweden. 
Megapus, g. n., p. 63. Type, M. spinipes, sp. n., p. 64, pi. i. fig. 4, id. 
1. c., Sweden. 
Mideopsis, g. n. ; type, M. depressa, sp. n., p. 67, pi. v. fig. 1, id. 1. c., 
Sweden. 
Libertia, g. n., p. 68. Type, L. insignis, sp. n., p. 69, pi. viii. fig. 4, 
id. 1. c., Sweden. 
Fseudomarica, g. n., p. 70. Type, P./ormosa, sp. n., p. 71, pi. v. fig. 2, 
id. 1. c., Sweden. 
Arrhenurus virens, p. 81, A. kjerrmanni, p. 83, pi. vi. fig. 3, A. forci- 
patus, p. 90, pi. vi. fig. 2, A. nobilis, p. 92, pi. x. fig. 1, and A. castaneus, 
p. 93, pi. ix. fig. 3, spp. nn., id. 1. c., Sweden. 
Anurania, g. n. For Acercus elegans, Neum., pi. xiv. fig. 3, and Acercws 
gotlandica, id. pi. xi. fig. 3, id. 1. c. p. 95, Sweden. 
Pontarachna, Phil. : genus discussed ; G. Haller, Arch. f. Nat. xlvi. 
1, p. 355 et seq. P. punctulum, Phil., p. 362, described ; P. globula, Phil., 
figured, pi. xvii. figs. 1-4. 
Gamasid^e. 
Gamasus sp. ?, found on a spider {Homoeomma familiar e) ; Bertkau, 
M6m. cour. Ac. Belg. 4to, xliii. p. 109, Tijuca. 
