ACARIDEA. 
Arachn. 25 
ACARIDEA. 
G. Haller, in a valuable and interesting paper (“ Die Milben als Para- 
siten der Wirbellosen, insbesondere der Arthropoden,” Halle-a-S. : 1880, 
pp. 1-90, with woodcuts), treats upon the Acaridean parasites and their 
relation to their hosts. Those known to belong to cevi'din Arthropoda are 
tabulated, and many original observations are recorded, as Well as useful 
references given to the extant literature on nomenclature, classification, 
and habits of this group of Acarids. Remarks are also made on collect- 
ing and preserving. 
The same author, in Acarinologisches,” Arch. f. Nat. xlvi. pp. 355- 
374, pi. xvii., discusses at considerable length : — (i.) The Hydrachnid 
genus Pontarachne, Phil. ii. Megamerus, Duges (Fam. Trombidiidcn)' 
iii. The supposed hearing organs of Acarids. 
P. M^gnin, in “ Les parasites et les maladies parasitaires,” Paris ; 1880, 
appears to bring together the results of his previous works on the sub- 
ject. He classifies the Acaridea (which occupy pp. 105-439 out of the 
456 pp. contained in the vol.) very nearly according to Dug4s and P. 
Gervais, dividing the order into 9 families : — i. Bdellidce ; ii. Tromhi- 
did(B’^ iii. Hydrachnidce \ iv. Gamasidm \ v. Ixod%d(x,\ Oribatid(B\ vii* 
Sarcoptidoi j viii. Demodicidm ; ix. Arctisconidce. In an analytical table, 
p. 108, two other families are intercalated, Limnocharidoi and Hygroba- 
tidce. Analytical tables are also given of the 5 families treated upon in 
the present work : — Gamasidce, p. 109^ Ixodidcn, p. 117, Sarcoptidce, p. 136, 
Troinbididm^ p. 238, and Demodicidce, p. 253. Numerous genera and 
species are characterized and described. Pp. 274-439 are occupied with 
details of the noxious effects of the attacks of Acari upon — i. the human 
subject, pp. 276-327 ; ii. indigenous domestic animals — the horse, pp. 
327^346, the ass and mule, p. 346, the ox, pp. 347-364, sheep, pp. 364-378, 
goat, pp. 378-382, pig, pp. 382-386, dog, pp. 386-404, cat, pp. 404-409, 
hare, pp. 409--413, domestic birds, pp. 413-425 ; iii. exotic domestic 
animals— dromedary, p. 425, llama, p. 427, giraffe, p. 427 ; iv. animals kept 
in menageries, and wild animals in a free state — lion, hyena, and bear, 
p. 429, fox, p. 430, wolf, p. 432, coati, p. 432, rat, p. 434, mouse, p. 436, 
gazelle and moufflon, pp. 436 & 437, bubal antelope, p. 437, chamois, 
pp. 437 & 438, monkey, p. 438, wombat, pp. 438 & 439. 
TROMBIDllDiE. 
P. PJcliARD, “ Sur un Acarien destructeur du Phylloxeta gallicole,” 
C. R. xc. pp. 1572 &. 1573, describes the larva of a Trombidium found at 
Vaucluse, in the larger galls of the Phylloxera ; no name is given to it. 
[C/l note by P. M%nin, Bull. Soc. Ent. Fr. (5) x. p. c., who received 
from the same district and a similar nidus the hexapod larvaB of Trom- 
bidium sericeum.'] 
Megamerus haltica^ sp. n., G. Haller, Arch. f. Nat. xlvi. p. 364, pi. xvii. 
figs. 6 & 6, Thunersee, in moss. 
Trombidium audiens, sp. n., G. Haller, 1. c. p. 370, figs. 7-9, Berne. 
