1962] Brady — Sosippus 1 5 1 
posterior edge of the carapace. Chelicerae black with lighter colored 
boss on each side. 
Sternum brown. Endites and labium dark brown, lighter at distal 
ends. Coxae dark gray-brown on ventral surface with lighter amber 
color at basal regions. Other leg segments gray-brown with lighter 
amber colored stripes as follows : dorsal paired stripes at proximal and 
distal ends of femora, stripe covering almost entire dorsal surface of 
patellae, paired stripes at distal end of tibiae. 
Abdomen (considerably shrivelled) dark brown, almost black, with 
a series of paired lighter spots formed from tufts of white hair. Venter 
brown. 
Diagnosis. Sosippus plutonus is most similar to S. calif ornicus in 
the shape of the epigynum. The median septum in S. plutonus (Fig. 
26) is shorter than in S. calif ornicus (Fig. 28). Sosippus plutonus is 
much darker than S. calif ornicus, being almost black, hence the specific 
name. 
Natural History. Sosippus plutonus presumably constructs a funnel 
web similar to that of S. calif ornicus. Sosippus plutonus is probably a 
montane species being found at extremely high altitudes in Mexico. 
Distribution. Mexico, Mexico. 
Records. Mexico. Tenango del Valle (Tenango de Arista), 2400 
m elev., 25-26 Aug. 1946 00 $ (H. Wagner) ; Tenancingo, 2050 m 
elev., 27 Sep.-7 Oct. 1946 00 (H. Wagner). 
Sosippus floridanus Simon 
Figures 1, 19, 20, 40-43. Map 1. 
Sosippus floridanus Simon, 1898, Ann. Soc. Ent. Belgique, 42:25. Female holo- 
type from Florida in the Paris Museum. Simon, 1898, Histoire naturelle 
des Araignees, 2 (2):323, 325. Comstock, 1913, The Spider Book, p. 622, 
op. cit. rev. ed., p. 639. Banks, 1904, Proc. Acad. Nat. Sci. Philadelphia, 
56:121, 135. Chamberlin, 1908, Proc. Acad. Nat. Sci. Philadelphia, 60:293, 
pi. 23, fig. 2, pi. 11, figs. 1 $, 4 9. Wallace, 1950, Florida Ent., 33:76. 
Roewer, 1954, Katalog der Araneae, 2:314. Bonnet, 1958, Bibliographia 
Araneorum, 2(4):4093. Roewer, 1959, Exploration du Parc National de 
l’Upemba, Araneae Lycosaeformia II (Lycosidae), p. 1004. 
Structure. For comparison of certain diagnostic measurements of 
S. floridanus to other species see Table 1. 
Posterior cheliceral margin with four teeth on each side. Of 37 
females examined, 35 had 4-4 posterior cheliceral teeth; two had 4-5 
posterior cheliceral teeth. Of 11 males examined 10 had 4-4 posterior 
cheliceral teeth, one had 4-5 posterior cheliceral teeth. 
Tibial spination in 16 females was the same as in S. calif ornicus 
with the exception of ventral spination on leg IF In this position nine 
