OF NATURAL HISTORY. 733 



the neuter abdomen is more remarkable than that of the female 

 It probably belongs to the genus PoJ>/er,jus. 

 A variety is much paler, even honey-yellow. 



5. F. TRIANGULARIS.— Diseoidal cellule .subtriangular ; black- 

 ish-piceous. 



Inhabits Indiana. 



Body blackish-piceous or obscure reddish-brown : hypostoma 

 convex and somewhat carinate : mandibles piceous : wings whit- 

 ish ; nervures pale ; diseoidal cellule subtriangular, the superior 

 angle being very obtuse ; first and second cubital cellules not 

 separated by a petiole ; anal nervure abruptly angulated on the 

 anal submargin : scale rather thin, elevated : tarsi honey-yellow. 



% Body darker. 



Length 9 over one-tenth of an inch j % about the same. 



Var. a. Recurrent nervure none. 



Var. P. Recurrent nervure obsolete or incomplete. 



Resembles sessilis nob., but the scale is obvious ; the diseoidal 

 cell is more triangular and the nervure of the second cubital is 

 obvious. 



6. F. DISLOCATA. — Yellowish ; anal nervure almost dislocated 

 at the anal emargination. 



Inhabits Indiana. 



Head black : hypostoma distinctly carinated : front [289] with 

 an acute, longitudinal, elevated line over the insertion of each 

 antennae and a slightly impressed line in the middle: antennae 

 and mandibles piceous : thorax honey-yellow, dusky before : 

 wings tinged with fuliginous ; nervures dusky and very distinct ; 

 recurrent nervure forming a quadrate cellule less than half the 

 size of the first cubital ; anal nervure abruptly angulated near 

 the anal emargination of the edge, and almost dislocated in that 

 part, the terminal portion being arcuated at each extremity : scale 

 thick, prominent, obtuse, entire : abdomen blackish, with pros- 

 trate hairs, and sparse elevated ones and regular eiliac on the 

 edges of the segments; first segment honey-yellowish at ba.se, 

 without any indentation opposite the scale : feet honey-yellow. 



% Trunk and scale entirely pale honey-yellowish : scapus of 



1885.] 



