ACARIDEA. 
Arachn. 53 
Nothrus nigro-femoratus, p. 112, pi. iii. fig. 23, and jninctatus^ p. 114, 
fig. 26, Novaya Zemlya, scaher, p. 113, fig. 24, Novaya Zemlya and Siberia, 
spp. nn., L. Koch, Sv. Ak. Handl. xvi. No. 6. 
Orihata reticulata, p. 115, and nitens, p. 117, fig. 4, Siberia, lucens, 
p. 115, fig. 2, Novaya Zemlya, crassipes, p. 116, fig. 3, Siberia and Novaya 
Zemlya, spp. nn., id. 1. c. pi. iv. 
Oppia sphcerica, p. 117, fig. 5, Novaya Zemlya and Siberia, and ohlonga, 
p. 118, fig. 6, Siberia, id. 1. c. pi. iv. 
Scutovertex, g. n. Allied to Eremccus. Cephalothorax with a tectum 
attached only by its base ; legs with three strongly heterodactyle claws. 
For S. sculptus, sp. n., A. D. Michael & C. F. George, J. R. Micr. Soc. ii. 
p. 242, pi. xi. fig. 4, England. 
Teg eocr anus labyrinthicus, p. 249, pi. xi. fig. 2, elongatus, p. 250, pi. x. 
fig- 7, iid. 1. c., England. 
Gamasid.®. 
P. Kramer, in a paper on some differences between full grown and 
young Gamasidce, Arch. f. Nat. xlv. (2) pp. 238-242, arrives at the 
following conclusions : — i. the absence of holding-flaps (Haftlappen) on 
the anterior pair of feet is peculiar to some $ ? and nymphs ; ii. the 
division of the dorsal shield belongs exclusively to the nymphs ; iii. the 
“border-figure’’ (“ Rand-figur ”) varies in form in nymphs, and even in 
both sexes. 
Gamasus armatus, p. 119, pi. iv. fig. 8, and tenellus, p. 120, pi. v. fig. 1, 
Novaya Zemlya, borealis, p. 120, fig. 2, and ovalis, p. 121, fig. 3, Siberia, 
spp. nn., L. Koch, 1. c. 
Gamasus, ? sp., Troupeau, Bull. Soc. Angers, vi. & vii. p. 115, figs. 28 
& 30. G. inoiquipes, sp. n., found on a common Bombus; P. A. Oonil, 
Period. Zool. Argent, iii. pp. 65-73, Cordova. 
Sejus excisus, p. 122, fig. 4, Siberia, and semitectus, p. 123, fig. 5, Novaya 
Zemlya, spp. nn., L. Koch, 1. c. pi. v. 
IxODiD.®. 
Amblyomma arcanum, sp. n., F. Karsch, Z. ges. Naturw. (3) iv. p. 366, 
West Africa. 
Cecidopus, g. n., near Amblyomma \ for C. diver sipes, sp. n., id. 1. c. 
p. 562, Ceylon. 
Margaropus, g. n., for M. winthemi. sp. n., id. MT. Miinch. ent. Ver. 
1879, p. 96, Valparaiso. 
Ixodes auricularis, sp. n., P. A. Conil, Act. Ac. Buenos Aires, iii. 
pp. 99-110. 
Ilolothyrus ? testudineus, Butl., described and figured ; A. G. Butler, 
Phil. Tr. clxviii. p. 508, pi. 52, fig. 11, Rodriguez. 
Trombidiidas. 
Trombidium holosericeum. A. Croneberg,, Bull. Mosc. liv. pp. 234-252, 
pi. V., in an apparently exhaustive description, with illustrations, shows 
its close resemblance to the Hydrachnids. Pagenstecher is disagreed 
1879. [voL. XVI.] B 23 
