114 
Rowland M. Shelley 
but he later realized that they were probably combined with the Georgia 
material. According to Horn (1884 a, b), LeConte visited California 
in 1850, staying in San Francisco, San Jose, and San Diego, after 
which he traveled to central Arizona. He then returned to California 
and New York, moving to Philadelphia in 1852. Consequently, the 
only places where LeConte is likely to have collected in California 
were around these cities, and San Diego is eliminated as a potential 
site because of its aridity. Polyzonioids do not occur nearly this far 
south, the southernmost hirudisomatid record being from central Santa 
Cruz County, some 330 mi (528 km) to the north. The original material 
therefore probably came from the vicinities of San Francisco and/or 
San Jose, which are within the ranges of the family and the striped 
species. 
Diagnosis — Dorsum with dark medial and two lighter lateral 
stripes; 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, moderately segre- 
gated; coxal lobe of latter moderately long and broad, apically rounded, 
leaning mediad and overlapping corners of 4th and 5th podomeres; 
dorsal branch of ultimate podomere short and broad, apically blunt, 
curved slightly ventrad and directed submediad; ventral lobe of ulti- 
mate podomere distinct, clearly overhanging dorsal branch; ultimate 
podomere of posterior gonopod apically fimbriate (Figs. 2, 6-11). 
Variation — Males with seemingly mature gonopods have from 
21 to 55 segments and vary in length from 2.8 to 19.1 mm; female 
segment numbers vary from 12 to 58, while lengths range from 1.6 
to 19.7 mm. These data are presented in table 1, with localities arranged 
in a general north to south sequence. Individuals are slightly longer 
toward the south of the range. 
Ecology — Habitat notations on vial labels include “under wet, 
rotting branches,” “redwood litter,” “under a piece of redwood log,” 
“on a redwood stump,” and “under rock on damp, muddy floor” in 
a cave. 
Distribution — The southernmost western species, O. bivirgata 
traverses San Francisco Bay and extends from coastal Curry County, 
Oregon, to central Santa Cruz County, California; although primarily 
hugging the coastline, the distribution extends eastward to the eastern 
slope of the Coast Range in western Colusa County (Fig. 28). Maximum 
dimensions are around 385 mi (616 km), north/south, and 67 mi (107 
km), east/west. Specimens were examined as follows; the initials 
AKJ in this and the succeeding account denote samples collected by 
