Psyche 
[June 
182 
for this species. The shape of the palpal tibia (Fig. 15) is an excellent 
distinguishing character and is quantified by the ratios PTT/CL and 
PTT/PTL (Table I). Because of the relatvely long metatarsus IV 
and short tarsus IV of A. gertschi , separation from the other two 
species is aided by IVML/IML and IVML/IVTarL (Table I) and 
from A. river si by IVTarL/CL (Table I). Because of the large 
body size of A. gertschi IVML, PFL, and even CL will help in 
identification. 
geographic variation. Males. M is the most divergent popula- 
tion sample and P the next most divergent in most of the characters 
studied. CL (Fig. 61) and almost all other measurements and 
meristic characters correlated with body size were much smaller in 
the two M specimens than in the other males. The greatest distance 
between sample M and the other samples occurs with the ratio 
ITarL/CL (Fig. 62) and other ratios expressing the relatively long 
tarsus I in these two specimens. Sample P has strikingly smaller 
values of IML/CL than the other males of A. gertschi (Fig. 63). 
Most of the other ratios yield smaller distances between populations 
than the measurements and meristic characters. 
CAT varies considerably within samples N, O and P, but averages 
thicker in P, and thinner in M, than in N and O, so that there is 
a north to south cline of increasing CAT diameter. Figure 52 is a 
cheliceral apophysis from M near the lower end of the range of 
variation. Figure 51 is an apophysis from O near the middle of the 
CAT range, and Figure 50 is an apophysis from P near the maximum 
CAT. The geographic variation pattern of the ratio CAT/CL is 
less clinal and shows much overlap. 
The tip of the outer conductor sclerite is rounded in the holotype 
(Fig. 58) and in all other males except two of sample N (from 
6700 ft. near Sand Flat Rd.) with considerably more pointed tips 
(Fig. 59) and both males from M with strongly pointed tips (Fig. 
60). The distance which the inner conductor sclerite extends beyond 
the end of the outer conductor sclerite varies considerably within 
most samples, but is longest in the M males. This latter variation 
may not be genetic, but rather due to palpal flexion prior to death. 
Intrapopulation variation in the number of enciform macrosetae 
on the tibia (range for all specimens is 13-18) and metatarsus (range 
for all specimens is 9-24) of leg I is large, and all population samples 
are connected by wide overlap. Figure 75 shows a metatarsus I 
with relatively few enciform macrosetae and Figure 74 shows a tibia 
with a larger number than the holotype (Fig. 76). 
