1964 ] 
Levi — Spider Genera 
81 
Longest patella and tibia one to two times carapace length. Male 
very much smaller than female. 
Epigynum with an indistinct oval depression; connecting ducts in 
most species characteristically coiled. The male palpus has the con- 
ductor absent or minute; the cymbium is uniquely modified to hold 
tip of long embolus. 
Diagnosis. The coloration, the coils of the internal genitalia, the 
superficially simple structure of the palpus, and the above mentioned 
modification of the cymbium separate this genus from the related 
Episinus , Spintharus , Thwaitesia and Aneiosimus. 
Distribution. The genus is known only from the Americas. 
Misplaced species. Chrosiothes australis Simon, 1896, = Aneio- 
simus australis (Simon). C. porteri Simon, 1900 — Aneiosimus 
australis (Simon). 
Key to species of Chrosiothes 
ia. Abdomen with seven dorsal humps (Fig. 36), Mexico .... litus 
lb. Abdomen with two or without humps 2 
2a. Abdomen with humps or abdomen as wide or wider than 
long 3 
2b. Abdomen without humps, longer than wide 8 
3a. Abdomen width equal to length or wider than long 4 
3b. Abdomen longer than wide 6 
4a. Abdomen with anterior lateral humps (1954, figs, 10, 19); 
Texas, Tamaulipas jo cos us 
4b. Abdomen without humps, or humps anterior dorsal 5 
5a. Palpal embolus as long as circumference of bulb (1954, fig. 
6); female abdomen with transverse stripes (1954, fig. 22); 
Tamaulipas to- Honduras tonala 
5b. Palpal embolus shorter than bulb circumference (Fig. 19); 
female abdomen with two dark spots (Fig. 22) ; Arizona to 
Nayarit, Mexico portalensis 
6a. Abdomen humps anterior (Fig. 39) ; California iviei 
6b. Abdomen humps in middle or posterior of abdomen 7 
7a. Abdomen widest in middle (Fig. 30) ; Jamaica jamaicensis 
7b. Abdomen widest posterior ( 1954, figs. 1 1, 21 ) ; Texas, northern 
Mexico minusculus 
8a. Abdomen widest in posterior half (1954, fig. 23); Veracruz, 
Mexico wagneri 
8b. Abdomen widest anterior or in middle 9 
9a. Abdomen suboval, rounded behind (1954, fig. 20); Utah, 
Colorado to central Mexico chirica 
