150 
Psyche 
[September 
markings, uniformly gray on ventral surface, but forming bands on 
the lateral and dorsal surfaces. Patellae and tibiae of same color, but 
darker markings form more indefinite pattern. Metatarsi and tarsi 
yellowish brown, without dusky markings. 
Dorsum of abdomen with basal lanceolate reddish brown mark, 
enclosed by typical wide dark brown stripe heavily pigmented with 
black. Dark brown median stripe bordered by lighter brown area, 
with lateral regions again becoming dark brown. Venter light yellow- 
ish brown. 
Diagnosis. Sosippus michoacawus has an abdominal pattern similar 
to S. calif ornicus. It is much darker in color than S. calif ornicus and 
is readily recognized by the female epigynum, which has a wide median 
septum and greatly expanded blade (Fig. 32). 
Natural History. No information concerning the habits is available. 
It presumably constructs a funnel-web like that of S. calif ornicus. 
Distribution. Michoacan and Guerrero. 
Records. Michoacan, Tzararacua Falls, 11 km from Uruapan, 
14 Jun. 1948 $$ (A. M., L. I. Davis). Guerrero. Mexcala, 2 Jul. 
1941 $ (L. I. Davis) . 
Sosippus plutonus sp. n. 
Figures 5, 25, 26. Map 1. 
Type. Female holotype from Tenango del Valle (Tenango de 
Arista), 2400 m elev., Mexico, Mexico, 25-26 Aug. 1946 (H. Wag- 
ner) in the American Museum of Natural History. 
Structure. For comparison of certain diagnostic measurements of 
S. plutonus to other species see Table 1. 
Female holotype with 3-3 posterior cheliceral teeth. Of seven 
immature specimens examined, six had 3-3 posterior cheliceral teeth, 
one 3-4. 
Tibial spination was the same as in S. calif ornicus with the follow- 
ing exceptions: ventral spination of leg II 1-2-2, dorsal spination of 
leg III 0-1-0. 
Clypeus height equal to the diameter of the AME. Labium slightly 
wider than long. 
Color. Pattern illustrated in Figure 5. Carapace very dark reddish 
brown with the eye region black. A few white hairs along the mid- 
line might be indicative of a thin median white line once present. 
Broad submarginal stripes, brownish yellow and covered with white 
pubescence, beginning about the third eye row and continuing to the 
