Hirudisomatid Millipeds 
127 
Variation — Males with seemingly mature gonopods have from 
22 to 38 segments and vary in length from 4.2 to 9.2 mm. Female 
segment numbers vary from 21 to 37 and lengths, from 5.0 to 8.5 
mm. These data are presented in table 3, with localities arranged in 
a general, north to south, sequence; no geographic trends are evident. 
Ecology — The types were retrieved from alder litter and moss, 
wood, and soil; another sample was discovered under “rotten madrone 
wood.” 
Distribution — A small subtriangular area in southwestern Oregon, 
slightly to the east of the northern range periphery of O. bivirgata 
(Fig. 28); dimensions are about 63 mi (100.8 km), north/south, and 
35 mi (56 km), east/west. In addition to the types, specimens were 
examined as follows: 
OREGON: Jackson Co., 6 mi (9.6 km) S Ruch, 7M, 4F, 13 
November 1971, EMB (WAS). Josephine Co., along Grave Cr., SW 
Wolf Creek (town), M, 30 May 1952, V. Roth (FSCA); 1 mi (1.6 
km) S, 0.5 mi (0.8 km) W O’Brien, F, 18 December 1971, EMB 
(WAS); and 2.5 mi (4 km) S, 1 mi (1.6 km) W O’Brien, M, 18 December 
1971, EMB (WAS). 
Octoglena sierra, new species 
Figs. 19-21 
Type specimens — Male holotype and one male and one female 
paratypes (VMNH) collected by Smith and R. O. Schuster, 15 April 
1958, 4 mi (6.4 km) W Newcastle, Placer County, California; other 
paratypes from this locality include 5 males and 3 females (VMNH) 
by same collectors, 12 March 1958; one male (NCSM) by same collectors, 
10 March 1959; and 2 females (VMNH) by Lange, Smith, and R. 
O. Schuster, 21 March 1958; one female paratype (VMNH) by Smith 
and R. O. Schuster, 19 March 1959, 4 mi (6.4 km) N Newcastle. 
Diagnosis — Dorsum without stripes, color pale yellow to white; 
caudal metatergal margins strongly upturned, caudolateral corners of 
midbody metatergites slightly but distinctly extended and rounded; 
telson broad, comprising entire breadth of caudal extremity; sternal 
lobes of anterior gonopods relatively short, widely segregated; coxal 
lobe of latter long and relatively broad, leaning mediad, overlapping 
4th-6th podomeres; dorsal branch of ultimate podomere long, narrow, 
and sinuate, apically acuminate, directed sublaterad; ventral lobe of 
ultimate podomere short and indistinct, only slightly overhanging dorsal 
branch; ultimate podomere of posterior gonopod apically fimbriate 
(Figs. 19-21). 
Variation — Males with seemingly mature gonopods have from 
