146 
Psyche 
[June 
rectly between tergite and sternite; sternite 8 with median basal 
process as illustrated in figure 5. 
Male: Protibia abruptly broadened just beyond base, its maxi- 
mum width about twice that of a mesotibia; apical half of outer 
face with an irregular row of spines intermixed with a few setae; 
rounded notch at apex on outside of tibia. Protarsus with first 
four tarsomeres expanded: the first a pedunculate triangle, next 
three roughly triangular with their anterior apical corners succes- 
sively more prolonged; ventral surfaces of first four segments with 
large strap-like setae (except medially); fifth tarsomere distinctly 
curved ventrally, apex twice as wide as base. Anterior protarsal 
claw much longer and thicker than all other tarsal claws, about 
four-fifths as long as protarsus. Posterior protarsal claw normal. 
Empodial setae on protarsus shorter than usual, about one-fourth 
as long as posterior claw. Peg setae (see Hammond, 1972) appear 
to be absent from legs. Genital segment and aedeagus as in figures 
6-8. Aedeagus with parameres dorsal within abdomen, internal 
sac with dense armature. 
Female: Protibia slender, similar to meso- and metatibia, spinose 
along entire outer face. Protarsus narrow (as meso- and metatar- 
sus), fifth tarsomere only slightly wider at apex than at base; nor- 
mal slender setae on ventral surface of tarsomeres 1-4. All tarsal 
claws similar in size and shape. Genitalia as in figure 5, sclerotized 
spermatheca apparently absent. 
Material examined: CALIFORNIA: Los Angeles Co.: Mt. Wilson, 
6— III— 46, G. P. Mackenzie (Holotype, male) [California Academy 
of Sciences]; Pasadena, Echo Mt., 18-III-16, 3500 ft., (1 male, 1 
female) [Museum of Comparative Zoology]; (Los Angeles Co.?) 
Pomona Mts., 11-22 (2 males, 1 female) [MCZ]. Santa Barbara 
Co.: Santa Barbara, 8— II— 9 1 (1 male) [MCZ]. 
Discussion 
The distinctive protarsi of Xenicopoda males may be modified 
to facilitate grasping females during copulation. There seem to be 
no corresponding special structures in females, but both the pro- 
notum and the elytra have fairly sharp lateral margins. Assuming 
that a male mounts a female dorsally (I have collected Eusphalerum 
mating this way), he might use his protarsi to grasp her pronotum 
or elytra in either of two ways: 1) with his tarsi dorsal and tarsal 
claws ventral to the lateral edge of the body; 2) with the anterior 
