ACARIDEA. 
Arachn. 29 
Canestrini, G., & Canestrini, R. I. Gamasi Italiani. Monographia. 
Padova : 1882, 80 pp. 7 pis. 
The work done by previous authors in this group is reviewed, and the 
characters which serve for the distinction of species are detailed. Among 
these characters are the form of the mouth-tube and body ; the charac- 
ters of the dorsal scutum ; those of the ventral plates and falces ; 
habitat ; colour, aud activity. The alimentation, parthenogenesis, and 
polymorphism of Gamasids are also treated of at length. Polymorphism 
is sexual and adaptive. The Gamasidce are divided into the genera 
Ilolostaspis, Gamasus, Latr., Stilochirus, G. & R. Canestr., Pcecilochirus, 
iid., Lcelaps , C. Koch, Epicrius, Canestr. & Fauz., Dermanyssus , Dup., 
Uropoda, De Geer, Polyaspis , Berl., Celceno, Koch, Pteroptus, Duj. 34 
species are described, 9 being new. 
R. Canestrini, Atti Soc. Pad. viii. pp. 133-146, pi. viii., gives reasons 
for placing the genus Nicoletiella in the family Oribatidce , and describes 
N. cornuta at some length. In a note, the author observes that (in 
Bull. Soc. Pad. viii.) [not seen by tho Recorder], Labidosloma , Kram., 
is suppressed, that it corresponds to Nicoletia, Canestr. & Fanz., aud that 
Nicoletiella is substituted for Nicoletia . 
Kramer, P. Ueber Gamasiden. Arch. f. Nat. xlviii. pp. 374-434, 
pis. xix. & xx. 
Reference is made by the author to his former paper on the Gamasidce 
(in 1876), and also to those subsequently published by Megnin, Haller, 
Michael, G. Canestrini, and A. Berlese. The Gamasidce are divided into 
3 sub-families, and 6 genera : — i. Pteroptina, 1 genus ( Pteroptus , Duj.) ; 
ii. Uropodina, 2 genera ( Uropoda , Deg., and Trachynotus, Kr.) ; iii. Gama- 
sina, 3 genera ( Sejus , C. Koch, Gamasus, Linn., and Dermanyssus , Duj.). 
Yarious species (3 new) are described aud figured. 
Nicoletiella cornuta , Can. & Fanz., compared with N. lutea , Kram. ; G. 
& R. Canestrini, Atti 1st. Yenet. (5) viii. p. 917, pi. x. 
Ilolostaspis tridentinus , sp. n., p. 28. Also Atti 1st. Yenet. p. 919, 
pi. ix. figs. 3 & 3 b. II. longispinosus , Kram., p. 29, id. Monographia, 
Padua, 1882. II. niveus , sp. n., G. Joseph, B. E. Z. xxvi. p. 14, Grotto 
at Seler-Hugel, near Gotschee. 
Gamasus quisquiliarum , p. 920, figs. 2 & 2 f, Rome and Messina ; G. 
brachiosus , p. 921, figs. 7 & 7b, Messina, spp. nn., id. 1. c. pi. viii. G. cras- 
sipes , Linn., p. 30, pi. ii. fig. 4, monachus , Koch, p. 32, pi. vi. figs. 3 a & 3 b, 
attenuatus , Koch, p. 34, pi. vi. figs. 5a-5c, & 7a-7e, fucorum , De Geer, 
p. 36, pis. iv. figs. 4-7, vi. figs. 6a & 6b, vii. figs. 5 a-5e, nemorensis , Koch, 
p. 42, pi. vii. figs. 2a & 2c, and la & 1 b, calcaratus, Koch, p. 44, pi. vii. 
figs. 6a & 6d, littoralis , Canestr., p. 46, pi. v. figs. 2, 2a, 2b & 2c,falciger, 
Canestr., p. 51, pi. v. figs. 3, 3a, 3 b & 3c, mucronatus, Canestr., p. 52, pi. v. 
figs. 4 & 4a, rubescens, p. 40, figs. 2a & 2b, cornutus , p. 48, figs. 8a-8A, 
furcatus, p. 49, fig. 9a-9<7, spiricornis , p. 50, figs. 9a-9J, pi. vi., spp. nn., 
id. Monographia. G. meridionalis, sp. n., A. Berlese, Acari, Miriapodi, &c., 
pt. i. No. 6, pi. vi., Sicilia, Apulia ; G. heringi, sp. n., G. Haller, JH. 
Yer. Wurtt. xxxviii. p. 298, pi. v. figs. 1, 2 & 3 ; G. longipes, sp. n., 
