A New Terrestrial Isopod from Oregon, Caucasonethes rothi n. sp. 
A. Vandel^ 
Mr. Vincent D. Roth, Technician and Cu- 
rator, Entomology Department, Oregon State 
College, captured a specimen of a remarkable 
terrestrial isopod 8 miles east of Gold Beach, 
Oregon. Upon the suggestion of Dr. Robert 
J. Menzies, San Diego, California, Roth sent 
me this specimen for determination. 
This specimen belongs to the genus Cau- 
casonethes Verhoeff, and to a new species, 
named C. rothi n. sp. in honor of the dis- 
coverer. 
The genus Caucasonethes belongs to the fam- 
ily Trichoniscidae and to a group of genera 
which includes Protrichoniscus Arc., Caucaso- 
nethes Verb., Escualdoniscus Vand., and Fina- 
loniscus Brian (and, perhaps, Brackenridgia Ul- 
rich, still imperfectly known). 
GENERIC CHARACTERS OF CAUCASONETHES 
VERHOEFF 1932 
I consider today that Amerigoniscus Vandel 
1950 is a synonym of Caucasonethes Verhoeff 
1932. The generic characters of Caucasonethes 
are the following: 
(1) Pleonites 4 and 5 destitute of glandular 
pores. 
(2) Peraeopod VII without secondary sex- 
ual characters. 
(3) Endopodite of pleopod 1 male uniseg- 
mented, likened to a lengthened tri- 
angular blade, destitute of terminal 
bristles. 
(4) Exopodite of pleopod 1 male with pos- 
terior end split into two lobes. 
(5) Endopodite of pleopod 2 male biseg- 
1 Professor of Zoology, Faculte des Sciences, Uni- 
versity of Toulouse, Toulouse, France. Manuscript 
received March 20, 1952. 
mented; distal article terminating in an 
acute and short point. 
SPECIES OF THE GENUS CAUCASONETHES 
The genus Caucasonethes includes three spe- 
cies: horutzkii N QxhoQFi 1932 (caves of Kutais 
and Zchal-Ziteli, in Transcaucasus; Birstein, 
1950: 356); henroti (Vandel, 1950) {Amerigo- 
niscus) (Gilly’s Cave, Pennington Gap, Vir- 
ginia); and rothi n. sp. 
The three species are very near one another 
but are easily distinguishable thus: 
1. Endopodite of pleopod 1 male 8 times 
longer than broad, rounded at tip 
henroti (Vandel) 
Endopodite of pleopod 1 male 10 times 
longer than broad, acute at tip 2 
2. Exopodite of pleopod 1 male with 2 
acute terminal lobes, widely separated 
from each other horutzkii Verhoeff 
Exopodite of pleopod 1 male with 2 
terminal approximated lobes, one quad- 
rangular, the other triangular, .rothi n. sp. 
Caucasonethes rothi n. sp. 
TYPE LOCALITY: Eight miles east of Gold 
Beach, Oregon, on the north bank of the 
Rogue River, under brocken rock and moss 
in a dense forest, April 29, 1951, V. Roth 
collector. 1 cf . The type is deposited in the 
collection of the author. 
size: (T, 5.5 X 2 mm. 
COLORATION: White; without pigment. 
EYES: absent. 
TEGUMENTAL CHARACTERS: Surface of head 
with 4 rows of granulations, the last one con- 
sisting of strong, projecting tubercles. Tergite 
I with 3, tergites II-VII with 2 rows of granu- 
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