438 
Psyche 
[September-December 
in depth. Variation of the quantitative characters (measurements, 
meristic characters, and ratios formed from these) was analyzed with 
the aid of an IBM 360 Model 30 computer. A Fortran IV program 
directed the computer to calculate the mean and standard deviation 
of each character for each local population sample of each sex and 
for certain groupings of local samples into larger infraspecific samples 
or species samples. The computer then compared these samples pair- 
wise in any desired combination, giving for each character for each 
comparison a value of the distinctness of the two samples. This 
“distance” value equals the difference between the means of the two 
samples divided by the sum of their standard deviations. 
This variation analysis was performed with the following number 
of characters: 23 measurements, one meristic character, and 39 ratios 
for males; 20 measurements, six meristic characters, and 50 ratios 
for females. The measurements and meristic characters were defined 
so as to be clearly delimited. Their abbreviations and definitions are 
as follows (see Figs. 2-7) : 
Figures 2-7: Measurements used in Aliatypus revision. See text for 
definitions. Figures 8-9: Macrosetae types. 8: ensiform. 9: attenuate. 
CL Maximum length of carapace measured as distance (along 
median longitudinal axis) between lines tangent to anterior- 
most and posteriormost edges of carapace, with lateral 
border of carapace in horizontal plane. 
PCL Length of pars cephalica measured as distance from anterior 
edge of thoracic groove along median longitudinal line. 
CW Maximum width of carapace along line perpendicular to 
median longitudinal axis. 
