1974] 
Reiskind — Castianeirinae 
1 8 1 
Description. Similar to female with the following differences: 
Only the anterior portion of carapace cephalic region dark-brown. 
Abdomen with a full scutum, granulose at anterior end and gradu- 
ally becoming smooth and shiny posteriorly. Tibia I ventral spina- 
tion: i-O and small. Genital bulb drawn out into a long neck ending 
with an embolus having a right angle near tip (illustrated in Reis- 
kind, 1969). 
Diagnosis. C. dugesi differs from other dugesi group members in 
its genitalia (right angle at end of male embolus and straight sper- 
mathecal necks) , distinct patterns of carapace and legs. 
Distribution. Apparently this species is restricted to a small region 
of central Mexico in northeastern Jalisco and Guanajuarto states. 
Records. Mexico. Guanajuarto. Jallisco: 10.8 mi. S. Talpa de 
Allende, 4900', 8-VIII-67 (R. E. Leech) ; 13 mi. SE. Lagos de 
Moreno, 6450', 7-IX-67 (R. E. Leech, G. E. Ball). 
The female of Castianeira dugesi would key out to couplet #36 
in the Key to the Females of Castianeira in Reiskind ( 1969). It can 
then be separated from the other species included in that couplet by 
its dark abdomen and bicolored carapace. 
I wish to thank Dr. Robin E. Leech for the generous loan of the 
specimens studied in this paper. 
Literature Cited 
Reiskind, J. 
1969. The Spider Subfamily Castianeirinae of North and Central 
America (Araneae, Clubionidae) . Bull. Mus. Comp. Zool. 138(5): 
163-325. 
