342 
The Ohio Naturalist. 
[Vol. XIV, No. 8, 
Eristalis vinetorum Fabricius. Widely distributed and com¬ 
mon from southern United States southward. Lynch reports 
it from Argentina and Macquart claimed to have it from Phila¬ 
delphia. We have abundance of specimens from Cuba, Guate¬ 
mala, British Guiana and Louisiana. 
Lycastrirhyncha Bigot. 
Lycastrirhyncha nitens Bigot. One specimen of this extra¬ 
ordinary species taken at Los Amates, Guatemala near the middle 
of January 1905. 
Meromacrus Rondoni. 
Meromacrus acutus Fabricius. One specimen from Los 
Amates, Guatemala. The front margins of the wings are widely 
infuscated. 
Dolichogyna Macquart. 
A genus somewhat related to Helophilus. The latter genus 
is listed from South America but all my specimens belong to 
Dolichogyna on account of the wide and prominent front, and the 
exserted sexual organ of the male. There may be some question 
whether or not it is advisable to separate the two genera on such 
small characters. I have four species which is more than is recog¬ 
nized usually, but surely the four are congeneric. The bibliog¬ 
raphy of the species of the genus is given by Williston in Trans¬ 
actions of the American Entomological Society, Vol. XIII, page 
320 and Vol. XV, page 392. 
KEY TO THE SPECIES. 
1. Specimens 10-12 mm. in length. 2. 
Spcimens less than 9 mm. in length, abrupta n. sp. 
2. Legs largely black, face much produced, nigripes Bigot. 
Legs largely yellow, face not so much produced. 3. 
3. Markings of the abdomen bright yellow, at most only a trace of 
pale color near the middorsal line. Legs all yellow. 
fasciata Macquart. 
Markings of the abdomen largely pale gray. Legs often partially 
black, variable, chilensis Guerin. 
Dolichogyna abrupta n. sp. Small sized species, markings of 
the abdomen mostly bright yellow. Length a little less than 
9 mm. 
Male. Ocelli widely separated and located within a black 
area at vertex, all the front except the vertex, yellow, a crescent 
shaped area immediately above the antennae devoid of pile, 
from thence to where the black grottnd color begins with promi¬ 
nent dark pile; the black vertex and rear of the head with yellow 
pile. Front prominent with the antennae inserted on the most 
prominent part. Face yellow, mostly naked, cheeks slightly 
brown on posterior margin. Dorsum of the thorax dark and 
clothed with yellow pile; margins next the insertions of the wings, 
two stripes near the mid-dorsal line and scutellum yellow; wings 
hyaline; legs mostly reddish yellow, some or all of the femora 
black or blackish on basal parts. Abdomen dark above, second 
