
478 THE AMERICAN NATURALIST.  [Vow. XXXVI. 
First two anterior spiracles very large, round, those following abruptly 
smaller, also round, gradually decreasing in size caudad, in the middle and 
posterior segments very small. 
Ventral plates with a median sulcus which is strongly impressed cephalad, 
becoming rather faint caudad. 
Legs all pilose; the first pair much smaller than those succeeding; ante- 
rior pairs much stouter and also longer than the posterior ; anal legs long, 
moderately to strongly swollen, armed with a short or very short claw. 
Last pleure moderately inflated, with about twelve pores which are sub- 
seriate and free, or sometimes a few covered by the last ventral plate ; 
last ventral plate moderately wide ( d) or narrower (9) ; anal pores present, ` 
moderate in size. 
Pairs of legs of male 67, of female 69. Length of male 43 mm., width 
1.3 mm. ; length of female 40 mm., width 1.2 mm. 
vidodpeieni- — Specimens 30 mm. long measure .8 mm. in width; pro- 
portionately wider cephalad than adult; length of antenna 2.6 mm.; 
pleural pores seven or eight on each side ; coloration nearly as in adults. 
Habitat. — Along the streams in the canyons near Salt Lake City. 
The types were collected in Neff's canyon, Salt Lake County, June 30, 
1900, by my brother, Mr. Seth C. Chamberlin. 
KEY TO WESTERN SPECIES OF LINOTJENIA. 
4,. Pairs of legs 71-81 ; individuals large. 
ó,. Pairs of legs 71 ; length 60 mm., head not punctate or spotted. 
parviceps (Wood) 
5, Pairs of legs 81; length 140 mm., head minutely spotted with white. 
epileptica (Wood) 
. Pairs of legs 37-47; individuals small. (Frontal — discrete, anal 
pores present, last ventral plate wide or moderate.) 
6,. Anal legs shorter than the penultimate ; tem pores 5-7, moder- 
ate; posterior border of cephalic plate straight; pairs of legs 
39-41 ; length 13.5-16.7 mm miuropus sp. nov. 
6,. Anal legs longer than the EEE rend pores 7-11, small ; 
posterior border of m = xd pairs of legs 43-47; 
length 20-21 mm ; micropus sp. nov. 
& 
(2 
Linotenia miuropus sp. nov. 
Description. — Robust, gradually attenuated caudad, more strongly 
cephalad ; head and entire body moderately or subdensely clothed with 
short hairs, smooth ; ferruginous, ventral plates and legs paler. 
 Antennz short (maximum length 1.2 mm.); moderately hirsute, decreas- 
ing in density distally, ultimate article subglabrous, hairs short or very 
short ; first articles of medium length, shorter distally, the ultimate longer 
than the two nme together. 

