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. 



DoLTCHOGYNA 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 vSociety, 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 ti. 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. 



fascia ta 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 antenna; devoid of pile, 

 from thence to where the black ground color begins with pronii- 

 nent dark pile; the black vertex and rear of the head with yellow 

 pile. Front prominent with the antennrc 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 scutcllum yellow; wings 

 hyaline; legs mostly reddish yellow, some or all of the femora 

 black or blackish on basal parts. Abdomen dark above, second 



