0. Harger—New North American Myriopods. 121 
Polydesmus armatus, sp. Nov. 
Color various shades of chestnut brown or sometimes oliva- 
ceous, with the lateral laminz and tip of anal seutum yellow ; 
a few of the posterior scuta are sometimes lighter colored than 
the others. he inferior border of the face, and the basal 
_ Joints of the antennz are yellow; distally the antenne are much 
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inner (is. 8, a) is cylindrical for the first third of its course, and 
; 
lamelliform, and sends inward and upward a much excavated 
“aig (fig. 8, c), distally a smaller and less excavated one 
hack 8, @), and is at this point contracted, but expands so as to 
co in a much bent plate. The other portion (fig. 8, 0) 
i ttl ong curved spine on a bristly cylindrical base, arising a 
title behind and outside of the former, and curving spirally 
around it, so that its attenuated tip is received in the excavated 
8 small stout hooked spine (fig. 8, e) is nearly con- 
aled 6 the bristles that spring from the base of the larger 
ength 28™™, 
Ge 18 Species resembles P. Haydenianus Wood, but may be 
, ate distinguished by the much produced anal scutum, and 
Oo. € male organs. It was collected in the John Day valley, 
regon, by Prof. G. H. Collier and the writer, in October, 1871. 
ae College, New Haven, Conn., June 27, 1872. 
EXPLANATION OF Puate IL. 
Figure s Trichopetalum lunatum, female, magnified 15 diameters. 
- Antenna and right eye of the same, magnified 40 diameters. 
3. Inferior view of seventh segment of male of the same, magnified 40 
_Glameters, 
4 Diagram of transverse section of segment of the same, magnified 30 
meters. ‘ 
“i dia e 
. Trichopetalum glomeratum. Antenna and right eye, magnified 265 
“# 6 diameters. ‘ 
Trichope Antenna, magnified 25 
orked : 
the bent plate, the corresponding process on the right side is figur 
u“ In position. : 
. Polydesmus armatus. Male appendages of left side magnified 20 
diameters, seen from below; a, larger process; 6, spine-like process ; 
¢ and d, processes from the upper surface of a; ¢, curved basal spine, 
J 
