1974 ] 
Coyle — Genus A liatypus 
455 
The Hume Lake conductor tips (Fig. 102) are blunt or slightly 
angularly truncate, and bend dorsad almost as strongly as the 
Yosemite conductor tips. The Pinehurst conductor tips (Fig. 1O4) 
are slightly broader and thicker, are angularly truncate, and bend 
only very slightly dorsad. The Woodlake, Glenville (Fig. 105), and 
Squaw Flat conductor tips are similar to those at Pinehurst, but are 
more angularly truncate and completely unbent. 
Rather strong variation occurs in the ratio IML/ITarL (Fig. 20), 
with Yosemite and Briceburg specimens distinct from Hume Lake 
and Pinehurst specimens. Tibia and metatarsus I setation varies 
geographically with Yosemite, Briceburg, Benton Station and Hume 
Lake specimens having 10 to 50 percent of the ventral macrosetae 
ensiform and relatively long densely distributed background setae. 
All other specimens have Jo to 100 percent of the ventral macrosetae 
ensiform, and shorter, less erect, less densely distributed background 
setae. The Yosemite and Briceburg specimens differ from the rest in 
that the pars thoracica is not markedly lighter than the pars cephalica. 
The Yosemite and Benton Station specimens differ from the rest in 
that the postocular setae extend back to a point at one-half or more 
of the distance from the anterior edge of the cephalothorax to the 
thoracic groove. 
Fe?nales: The female population samples also show a considerable 
amount of geographic variation, which is not surprising for such a 
widespread species. The chief variation pattern is that most samples 
(Hume Lake, Pinehurst, Woodlake, Sequoia, and Glenville) are 
quite similar, but that the northern samples (Yosemite, Briceburg, 
and Mammoth Lakes) do not form as homogeneous a grouping and 
each differs almost distinctively from most other samples in a few 
characters. The very small sample sizes limit the strength of any 
conclusions. 
Discontinuous geographic variation in quantitative characters in- 
volves those ratios incorporating PSS and PSL (Figs. 22 and 24). 
In these ratios the Mammoth Lakes population, with its smaller, 
more widely spaced posterior sigilla, is quite divergent. CL/IVTarL 
(Fig. 23) exhibits rather strong geographic variation with the 
Yosemite specimen very divergent. Other quantitative characters 
exhibit less geographic variation. 
Variation in seminal receptacle form is illustrated by Figures 132- 
143. All samples except those from the Yosemite-Briceburg area 
have very similar seminal receptacles. In both the Yosemite and 
Briceburg specimens, the stalk base is not much thicker than the 
distal end, a condition similar to that of A. calif ornicus. Additional 
