144 
Psyche 
[September 
mexicanus is separated from S. calif ornicus by the form of the epigy- 
num and by the dorsal color pattern of the abdomen (compare Fig. 8 
with Fig. 6). 
Natural History. In southern Arizona, according to J. A. Beatty 
(unpublished, 1961), S. calif ornicus is found primarily in riparian 
woodland formations. These associations occur in or adjacent to drain- 
ageways and their floodplains and are characterized by different vege- 
tation than that of the surrounding non-riparian community. This 
spider occurs at varying elevations depending upon the amount of 
vegetation and moisture available. In the Santa Catalina Mountains 
it was collected at about 850 m. 
Sosippus calif ornicus constructs expansive webs with a central 
funnel-shaped retreat leading to the base of vegetation, into crevices, 
or under rocks. In El Coyote, Sonora it was collected from webs 
leading under rocks in a dry stream bed at about 1000 m. A female 
with egg case was collected from beneath a rock in a canyon filled 
with Palm trees, 26 km east of Magdalena, about 1300 m elevation. 
Distribution. Baja California, southern California, Arizona, south 
to Nayarit (Map 1). 
Records. Baja California. 9 holotype. California. Imperial Co. : 
NE corner 9 (J. Anderson). Los Angeles Co.: Claremont (Baker). 
Arizona. Maricopa Co.: Buckeye, 19 Feb. 1956 o (T. Barry) ; Mesa, 
21 Man-23 May 00, 16 Jul.-n Nov. cf cf 9 $ (sev. coll.) ; Phoenix, 
12-23 Feb. 1956 00 (sev. coll.) ; Santa Cruz River Vallejo, 9 May 1940 
O (R. H. Crandall) ; Tempe, 14 Feb.-27 Mar., 20 Nov. i960 00 (sev. 
coll.). Pima Co.: Baboquivari Mountains, Brown’s Canyon, 22 Apr. 
1961 00 (J. A. Beatty), 9 Jun. 1952 cf cf 99 with egg cases (M. 
Cazier, W. J. Gertsch, R. Schrammel), 4 Sep. 1951 9 ? (W. S. 
Creighton), Rancho El Mirador, 4 Sep. 1950 9 (W. J. Gertsch); 
Santa Catalina Mountains, Sabino Canyon, 10 Apr. 1959, 26 Sep. 
1959, 20 Nov. i960 00 , 26 Jun. -2 1 Aug. i960 cf cf 99 (J- A. Beatty), 
6 Jun. 1952 cf cf (M. Cazier, W. J. Gertsch, R. Schrammel). Yuma 
Co.: Yuma, 12 Feb. 1961 o (J. A. Beatty). Sonora. El Coyote, 28 
km E of Rio Bavisbee, 1000 m, 19-24 Jul. i960 99 with egg case, 
26 km E of Magdalena, 1300 m, 16 Jul. i960 9 (J- A. Beatty) ; 
Minas Nuevas, 8 Aug. 1952 9 (P., C. Vaurie) ; Navajoa, 6 Aug. 
1956 9 (V. Roth & W. J. Gertsch). Sinaloa. Culiacan, 19 Jun. 1939 
cf (A. M., L. I. Davis). Nayarit. Acaponeta, 20 Nov. 1939 00 (C. 
M. Bogert, H. E. Vokes) ; Mecatan, 23 May 1949 cf (G. M. 
Bradt) ; San Bias, 6 Aug. 1947 9 (C., M. Goodnight, B. Malkin). 
