20 H -Canadian Arctic Expedition, 1913-18 
Ethopolys Chamberlin.i . 
This genus includes a group of North American species known at present 
only from the region west of the Rocky mountains where they are common and 
range from southern California, Nevada, and Utah northward into Alaska. 
Ethpolys integer, n. sp. 
Dorsum mostly dark brown with the caudal plates darker; major plates 
often darkened over the lateral and caudal borders; major plates of posterior 
half of body typically with a distinct longitudinal median black stripe, this 
becoming more indistinct on the anterior plates. Head, as also in part the first 
dorsal plate in some, reddish brown to chestnut; a blackish median longitudinal 
stripe extending from caudal margin to frontal suture. Antennae brown to light 
chestnut, paler distad. Venter light brown, the fourteenth and fifteenth 
sternites commonly of chestnut tinge. Prosternum and prehensors also of light 
chestnut tinge. Legs testaceous, the posterior pairs darker, brown to light 
chestnut. 
Body of same form in male and female. About eight times longer than 
width of tenth plate. Head and first dorsal plate of same width and narrower 
than the tenth plate. 
Head distinctly wider than long (86 : 79) ; widest a little caudad of lateral 
breaks. A V-shaped impression on caudal half of plate. Entire surface sub- 
densely punctuate, the punctse distinct. 
Ocelli from twelve to nineteen in three or four series, but by far most com- 
monly in four; e.g., 1 + 5, 6, 4, 3; 1 + 6, 5, 4, 3; 1 + 5, 5, 4, 2; 1 + 5, 4, 3, 2; 
1 + 5, 4, 2; 1 + 6, 5, 3. Single ocellus much largest, clearly separated by a 
space from the others. Seriate ocelli distinct, regular, decreasing moderately 
ventrad and cephalad. 
Antennae reaching to from fifth to eighth segments, but mostly to the sixth 
or seventh. Articles twenty to twenty-four, long and cylindric. Ultimate 
article long and slender, a little shorter than the two preceding taken together. 
Prosternum about 1 • 7 times wider than long. Chitinous lines well devel- 
oped excepting toward caudal ends. Finely densely punctuate. Spine inserted 
on ventral surface a little caudad of the anterior edge; moderately short, uni- 
formly attenuated to an acute point; much stouter than the ordinary bristles. 
Teeth conical; those adjacent to the diastema on each side largest. Most 
commonly three or four teeth ectad of diastema but also sometimes only two. 
Examples of dental formulae are the following, the left side being represented 
first: 3 — 7 + 6 — 3, this being the commonest of number and arrangements; 
3-6 + 6-3; 3-5 + 6-3; 4-6 + 6-4; 2-6 + 6-3; 2-6 + 6-2; 2-6 + 5-2. 
All dorsal plates distinctly and rather coarsely punctuate, and, especially 
the caudal ones, rather finely rugose and irregularly tuberculate toward lateral 
borders, the median portion remaining nearly smooth excepting on the fifteenth 
plate. 
Q • f fi f 1 Q- 0> 3, 2, 1 ^ 0, 0, 3, 2, 2 „ ^, w . ,1 ■ 
Spmes of nrst legs ^ „ ^ to — ^ r, q o ) of the second to tenth pairs, 
U, U, lij o 1 Ii U, U, ii, o, Z 
of the eleventh, ' ' ' ' ; of the twelfth, ' ' ' ' or 
U. U, o, o, u U, i, o, o, 2i 
13 3 2' of the thirteenth, ^^-y-y-y^; of the penult, ^ ' ' ' ^ , with two 
accessory claws; of the anal, ' ' ' ' , claw single or with a very minute 
1, 1, o, 2, i 
accessory claw. Last two pairs, or occasionally only the last pair, of coxae 
laterally armed. 
iCan. Entomologist, 1912, p. 13. 
0, 0, 3, 2, 
2 
0, 0, 2, 3, 
0, 0, 3, 2, 
2' 
2 
