86 PROCEEDINGS : BOSTON SOCIETY NATURAL HISTORY. 
One male, Opelousas, La. Collected by Mr. G. R. Pilate in 
May, 1897. 
In the last two species, as in P.fuscus , the relative lengths of 
the third and fourth costal segments are very difficult to determine; 
moreover I cannot be quite sure that there is not a very little brown 
color in the stigma at its extreme apical angle. There is, however, 
so little of this color, if any, that there can be no impropriety in 
placing the species in this third division. 
Only about ninety species of this family are known, of which fifty- 
eight are European. Undoubtedly there are many more species to 
be discovered. 
i 
Printed, July , 1S9D. 
