1919.] NATURAL SCIENCES OF PHILADELPHIA. 127 



are excluded on account of their more anterior ventrals, in all of 

 which they are said to be distinctly before the dorsal origin. 



(For Hermano Apolinar Maria, of the Institute de La Salle, Bogota, 

 to whom I am indebted for the opportunity to study this interesting 

 prenadilla.) 



Explanation of Plate VI II. 



Uppermost figure, male; upper figure to left, dorsal view of head (male); 

 upper figure to right, ventral view of head (male); median figure, young; lowest 

 figure, female. 



