624 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.49. 



Differs from Clausicella as follows: 



Male. — Cheeks hardly over one-fourth eye-height. Third antennal 

 joint siibtriangular in profile, gi'eatly widened distally, its apical 

 greater than its upper and about equal to its under profile, the apical 

 edge rather evenly rounded. Apical cell very narrowly open, ending 

 in wing-tip. Vibrissal axis of head distinctly shorter than antennal 

 axis. Arista short, second and third joints equal. Hind crossvein 

 nearer to smaU crossvein. Vertex much wider than one eye, ocellar 

 area occupymg one-half length of front. AU macrochaetae weak. 

 Abdomen short, ovoconical, rounded at tip, hypopygium large. 

 Face over twice as wide as one eye, paraf acials linear, facial depression 

 only slightly sunken. 



EUTHRYPTOCERA, new genus. 



Genotype. — TacJiina latifrons Meigen, Syst. Beschr., vol. 4, 1824, 

 p. 365. No. 217. 



This is Brauer and Bergenstamm's sense of Tliryptocera. The geno- 

 type of TJiryptocera Macquart ^ is hereby designated as Thryptocera 

 hicolor Macquart (not Meigen) .^ For characterization of Euthrypto- 

 cera, see Brauer and Bergenstamm, Denkschr. Akad. Wien, vol. 56, 

 1889, p. 102, fig. 84, and vol. 60, 1893, p. 150, under Tliryptocera 

 Brauer and Bergenstamm. 



CHAETOSTIGMOPTERA, new genus. 



Genotype. — Cliaetoplileps crassinervis Walton, Ent. News, vol. 24, 

 1913, p. 51. 



Differs from C^agfo^j^Ze^^s as follows: Paraf acials Unear. Epistoma 

 very prominent, projecting. Cheeks over one-fourth eye-height. 

 Faciaha bare. Antennae shorter, third joint bulged on lower border 

 and only three and one-half times second. Arista not so incrassate, 

 more pubescent. Female without piercer or ventral carina. No 

 discal bristles on abdomen. Apical ceU narrowly open, or nearly 

 closed, ending slightly behind extreme wingtip. Fourth vein merely 

 bent in even gentle curve. Hind crossvein about in middle between 

 cubitus and small crossvein. First vein incrassate distaUy, the 

 incrassation bristled. Claws microscopic in both sexes. 



The holotype is a male. Three females, from Maryland, show the 

 wing stigma fuscous. 



SLOSSONAEMYIA, new genus. 



Genotype. — ChaetopTileps rostrata CoquiUett, Can. Ent., vol. 30, 1898, 

 p. 235. 



Differs from Clmetostigmoptera as follows: Wings narrower. First 

 vein not thickened distally. Apical cell well open. Hind crossvein 



> Soc. Sci. LUle, 18S4, p. 310. 2 Soc. Sci. Lille, 1834, p. 312. 



