146 
Psyche 
[September 
men with a concentration of white pigment under the integument, 
overlaid with yellow, producing a cream color. 
Male. Median longitudinal stripe of carapace not as distinct as in 
the female. Dorsum of abdomen with a series of paired white spots 
outlining wide brown median stripe, otherwise similar to female in 
coloration. 
Diagnosis. This species is similar to S. agalenoides in the form of 
the epigynum. It is separated from S. agalenoides most easily on the 
basis of size in the limited number of specimens examined. Sosippus 
mexicanus does not exceed 15 mm in total body length and S. agale- 
noides is not less than 20 mm. Sosippus mexicanus also differs from 
S. agalenoides in the dorsal pattern of the abdomen (compare Fig. 6 
to Fig. 9) and tibial spination. Sosippus agalenoides is more hairy 
than S. mexicanus , especially on the dorsum of the abdomen. The 
venter of the abdomen in S. mexicanus is characterized by white pig- 
ment underlying the integument, which is not found in S. agalenoides. 
If the differences in tibial spination remain consistent upon examina- 
tion of a larger series of specimens, this will provide an easy method of 
separation. 
Natural History. According to F. Pickard-Cambridge (1902), 
“The spiders of this genus are very much like Agelenae , not only in 
the shape of their body and the appearance of their legs, but to some 
extent their markings. Still more do they resemble them in habits, for 
the web consists of a very large sheet of fine silk spun over the bushes, 
with a tube-like tunnel running down into some place of safety. Their 
movements are exceedingly rapid, and one cannot at first sight believe 
they are not true A gelenae ” 
Distribution. Guerrero to Guatamala, 
Records. Guerrero. Acapulco de Juarez, 1 Sep. 1940 (H. E. 
Frizzell). Guatamala. <$ (Sarg). N. Banks (1909) reported this 
species from Costa Rica, but the specimens in question are immature 
and appear to be S. agalenoides , which Banks described from Costa 
Rica. 
Sosippus agalenoides Banks 
Figures 9, 29, 30. Map 1. 
Sosippus agalenoides Banks, 1909, Acad. Nat. Sci. Philadelphia, 61:217, pi. 
6, fig. 33. Three female syntypes and one juvenile from Puntarenas, Costa 
Rica, in the Museum of Comparative Zoology, examined. Roewer, 1954, 
Katalog der Araneae, 2:313. Bonnet, 1958, Bibliographia Araneorum, 
2(4):4093. Roewer, 1959, Exploration du Parc National de l’Upemba, 
Araneae Lycosaeformia II (Lycosidae), p. 1004. 
