Hirudisomatid Millipeds 
123 
Table 2. Continued. 
County 
Locality 
Males 
Segs. Lengths 
Females 
Segs. Lengths 
Lane, OR 
11 mi NE 
38 
13.3 
Blue R. 
Lane, OR 
18.5 mi ESE 
31 
8.4 
Springfield 
30 
9.8 
(4) 28 
7.5 
25 
5.9 
Douglas, OR 
Comstock 
34 
10.0 
32 9.6 
40 segments, which is 12.9 mm. Female segment numbers vary from 
5 to 22, while lengths range from 1.0 to 9.6 mm. These data are 
presented in table 2, with localities arranged in a general north to 
south sequence. Lengths appear roughly comparable throughout the 
range, and no geographic trends are evident. 
Ecology — The neotype was recovered from maple litter; habitat 
notations on labels in other vials include “under moss on forest floor,” 
“berlese conifer duff,” “willow, maple, fir duff, moss,” “in littler under 
firs, cedars,” “deciduous litter, grass,” “under log,” “bark, moss, debris,” 
“ash, oak, conifer duff,” “oak litter, rotted wood,” and “berlese beach 
grass debris, dried seaweed, spruce duff.” 
Distribution — The northernmost species, O. anura extends along 
the Pacific Coast from the southwestern corner of the British Columbia 
mainland to northern Douglas County, Oregon, and ranges inland to 
the western slope of the Cascade Mountains (Fig. 28); dimensions 
are approximately 385 mi (616 km), north/south, and 110 mi (176 
km), east/west, the former being about the same distance as the north/ 
south dimension of O. bivirgata. Specimens were examined as follows; 
to consolidate records, I repeat the five from British Columbia cited 
by Shelley (1990). The initials EMB in this and the following account 
denote samples collected by E. M. Benedict, primarily from berlese 
extracts. 
CANADA: BRITISH COLUMBIA: Burnaby Mtn., Simon Fraser 
Univ., 2M, 2F, 1972, R. G. Holmberg (CMN); Burquitlam, F, 10 March 
1940, W. Dale (NMNH); Steelhead, F, 2 June 1933, H. B. Leech 
(NMNH); Agassiz, F, 7 March 1931, H. B. Leech (NMNH); 1.9 mi 
(3 km) SE Hope, Silver Skagit Rd., 8M, 13F, 4 juvs., 30 June 1988, 
S. & J. Peck (NCSM); and Manning Prov. Pk., West Gate, 2M, 2F, 
