1967] 
Levi — Behavior of Sicarius 
325 
Fig. 2. Male depositing sperm on sperm web. 
LIFE SPAN 
From a newly hatched eggcase given to me by Dr. W. K. Wey- 
rauch in February 1965 in Tucuman, we reared two males and one 
female that molted to maturity during June 1967 and one male that 
matured in October 1967. The individuals took more than two years 
to mature. Individuals of species 2 from Lima, Peru, were 1 1/2 
years old and less than half grown in August 1967. An adult in- 
dividual collected on 2 April 1965 (under a log in pasture near 
Santiago del Estero) appeared moribund in July, 1967; it had not 
fed for some time, no longer buried itself, and looked emaciated. 
After placing it in alcohol, I discovered it was a male. ( Male sicariids 
differ from females by having longer legs and by modifications of the 
pedipalps that are not readily apparent). As far as we know, the 
individual had never molted, had lived at least two years beyond 
reaching maturity, and was probably at least four years old. After 
killing the male, we discovered that its container had become moldy, 
a condition that would be injurious to most spiders; thus it may have 
been moribund not from old age, but from poor laboratory conditions. 
DISCUSSION 
Although related, sicariids are very different from scytodid spiders. 
While the slow scytodids overpower their prey by spitting a viscid, 
entangling substance, the sicariids are strong, fast moving predators 
