404 Annals Entomological Society of America [Vol. XIII, 



m lacking; Cu forked, the basal deflection of .C«i without macro trichias ; 

 a single, semi-atrophied anal vein. Male hypopygium very small, 

 densely covered by hairs; pleurites stout (Fig. S), each near the apex on 

 the inner face with a dense bnish of stout black hairs; the single pleural 

 appendage deeply bifid. Ninth sternite (Fig. 9) produced into a flat- 

 tened pale appendage, deeply bifid at the apex, the margins provided 

 with a few setse. Penis-guard far within the body; a long, straight rod 

 with the apex a little enlarged. 



Genotype. Bruchomyia argentina, sp. n. (Southern Neo- 

 tropical Region). 



This remarkable new genus presents such a distinct appear- 

 ance from all other members of the family that it is necessary 

 to isolate the group. In its general appearance, the fly is 

 strikingly like a large, very hairy Molophilus, the resemblance 

 being heightened by the long, hairy wings, the long veins and 

 deep forks, the concealed hypopygium, the elongate antenn£e, 

 and even the patch of dark hairs on the wing-disk, a character 

 found in many species of Molophilus. It should be noted that 

 although the venation is herein interpreted in accordance with 

 the principles of the Comstock-Needham system, the dis- 

 tribution of the branches of media and cubitus render it highly 

 probable that the contentions of Dr. Tillyard, that in the 

 Diptera media is typically four branched, cubitus one branched, 

 are correct. The portion of the vein labelled Cu\ appears to 

 be the posterior branch of the last forking of media, the basal 

 deflection being without macrotrichi^ and very indistinct. 

 This would be the m-cu crossvein of Tillyard. The semi- 

 atrophied posterior branch of cubitus that was indicated by 

 the writer as possibly being the atrophied first anal vein in 

 Tipulidae (The Crane-flies of New York, Cornell Memoir 25, 

 pp. 867, 8C)8; 1919) is here ver}^ weak, but indicated. 



Nothing is known of the habits of these flies, but they were 

 associated in collections with Pectinotipiila argentina (Van der 

 Wulp), Holorusia jujuyensis Alexander, Brachypremna australis 

 Alexander, Gonomyia (Leiponeura) bruchi Alexander and other 

 species of Tipulidae and Dixa argentina Alexander. The genus 

 must be regarded as the most generalized living Tipuloidean fly, 

 this being amply demonstrated by the great number of antennal 

 segments and wing-veins, the forking of all the longitudinal 

 veins far back near the wing-base and the consequent very 

 deep forks and other characters. The discovery of the immature 

 stages would be a matter of extreme interest. 



