2 
Psyche 
[March - June 
spread and occur in widely disjunct populations. As was true in 
Sinella , the majority of the collections of troglophile forms falls out- 
side of the areas occupied by the troglobite species. 
Biology 
Little accurate, detailed information is available concerning the 
biology of the members of this genus. The visible gut contents indicate 
that fungal hvphae and spores make up the major portion of the diet 
of most members. The incompleteness of the data on and collections of 
both cave and epigeic forms of this genus makes it difficult to classify 
the habitat of the various species. On a basis of present data we can 
place the forms described here into four groups: i) the definite troglo- 
GRAPH I 
Graph 1. Curves showing the differing ratios of the fourth antennal seg- 
ment to the cephalic diagonal in the cave species of U. S. Pseudo sinella. 
A includes: P. argentea, P. folsomi, P . duodecimpunctata , P. alba, and P. 
scxoeulata; B: P. dubia; C (a probable average of several curves): P. 
hirsuta ; D: P. gisini \ E: P. spinosa ; and F: P. boneti. 
bites — including P. spinosa, P. boneti, P. espana, P. hirsuta, and P. 
gisini; 2) the doubtful troglobites — P. dubia and P. orba ; 3) the 
doubtful troglophile — P. argentea ; and 4) the definite troglophiles 
— P. petterseni, P. alba, P. folsomi, P. duodecimpunctata, and P. 
sexoculata. 
