1920] Alexander: Tanyderid Flies 403 



The new genus Bruchomyia is based on material sent to the 

 writer by Dr. Charles Bruch, to whom this remarkable fly is 

 dedicated as an appreciation of the kind co-operation he has 

 shown the writer in conducting a study of the Argentinian 

 Tipuloidea. 



Subfamily Bruchomyiin^, subfam. n. 



vSmall flies (Fig. 1), having the general appearance of a Molophilus 

 (Tipulidae) ; body and wings covered with long, dense hairs. Antennae 

 setaceous, with 30 segments, the last segment minute. Legs with the 

 coxas very long; tibiae spurred; tarsal claws minute. Wings with Sci 

 lacking or apparently so; R and M forking far back near the wing-base, 

 the forks being very deep ; crossvein m lacking ; anal vein subatrophied ; 

 anal angle of the wings lacking, this region fringed with very long hairs. 

 Male hypopygium very small, concealed within the body; a single 

 pleural appendage that is bifid. 



The members of the Tanyderinae are all large flies with the body not 

 conspicuously hairy; antennas with never more than 25 segments; m 

 present; anal angle present and usually very prominent. 



Genus Bruchomyia, gen. n. 



Body (Fig. 1), very hairy, the head, thorax and abdomen provided 

 with long, dense, erect hairs. Rostrum but slightly produced; palpi 

 very large and conspicuous, very hairy, apparently foiu: segmented, 

 possibly five segmented. Antennae (Fig. 4), 30 segmented; flagellar 

 segments 28 in number, the last segment minute; scapal segments 

 subequal in size, small, subglobular, the second with a circlet of short 

 verticillate hairs ; flagellum setaceous ; first segment about as long as the 

 following two taken together; fiagellar segments 2 to about 20 subequal, 

 elongate cylindrical; remaining segments gradually shortened, the last 

 segment very tiny, button-like, the penultimate and antepenultimate 

 oval (Fig. 5). Eyes very large, naked; ommatidia moderately large; 

 eyes separated on the vertex (Fig. 3) only by a narrow strip that is from 

 one-fourth to one-half the diameter of the basal scapal segment. Vertex 

 with a dense crest of erect hairs. Legs (Fig. 6) comparatively stout; 

 coxas very long and slender, like a Mycetophilid ; femora shorter than the 

 tibiae; tarsal segments gradually shortened from the first to the fifth; 

 tibiae provided with long, conspicuous bristles; tarsal segments with 

 shorter, more flattened bristles; claws (Fig. 7) very small, subappressed 

 to the end of the tarsus, the edges roughened, the rather long apex 

 smooth; two slender tibial spurs. Wings with no anal angle; veins 

 and margins with abundant long hairs that are especially elongate and 

 conspicuous in the region of the anal angle ; at the union of r-m with R^ is 

 a triangular chitinized area that is provided with conspicuous black 

 hairs. Venation (Fig. 2) : Sc\ lacking, Sc^ ending in R before the fork 

 of i?2+3; Rs originating close to the wing-base, slightly proximad of the 

 fork of M; Rs with four branches; M forking far back near the wing- 

 base, the upper fork with two branches, the lower fork unbranched; 



