INSECUTOR INSClTlyE M^NSTRUUS 107 
Holotype, male, Carolina, Porto Rico, altitude 100 feet. 
Crab-holes in under rocks, September 11, 1914. Through Dr. 
C. S. Ludlow. 
Type, No. 19661, U. S. Nat. Mus. 
This interesting fly agrees most closely with P. grisea Alex- 
ander^ from Panama from which it differs in the venation, 
the lack of a distinct narrow pleural stripe, and in having the 
scapal segments of the antennae quite distinct in color; the 
color of the posterior legs of grisea is still unknown. P. pul- 
chricornis Alexander- from British Guiana is likewise allied 
to geniculata in the uniform brown tarsi but differs in the 
possession of a broad pleural stripe, the darker wings with the 
radial crossvein set far back from the tip of R^, etc. 
'Alexander, C. P. Proc. U. S. Nat. Mus., vol. 44, p. 535, 1913. 
"Alexander, C. P. Trans. Am. Ent. Soc, vol. 40, p. 251, 1914. 
