AMERICAN DIPTERA. 393 



tremity ; subraarginal reaching the apex of the wing, arcuate al 

 the base straight at the apex. Median nervure straight." 



"The name refers to the long spur of the intermediate tibiae." 



Type, 0. rufipennis Macq. 



This genus was based upon an unrecognized species of Macquart, 

 otherwise the diagnosis would apply tolerably well to A.phioch?eta (as 

 would also his Trisometopia)} It seems unwise, however, to resur 

 reet this old name, which is without significance, resting as it does 

 upon an unrecognizable species; and to modify the diagnosis to suit 

 a large group of species since described. This would also involve 

 choosing a new type species for the genus. For this reason I think 

 it had best he discarded. 



D1PLONEURA Lioy. 



1864. Liny Atti, Soc. Veneti., 77. 

 " Frontal macrochsetse directed downwards, palpi usually broad ; 

 legs setulose, tibia often almost bare; wings with the margin ciliated 

 strongly. Marginal vein bifurcate at the extremity, submarginal 

 reaching to the apex of the wing, arcuate both at the base and 

 apex ; median nervure straight." 



"The name refers to the furcate marginal vein." 

 "Types D. nitidula Meig., D. florea Meig., D. atra Macq." 

 Of the types chosen for this genus, the first cannot be recognized, 

 and the type of the species does not seem to be extant (Becker, 01, 

 71). The second belongs to Phora, having all the frontal bristles 

 reclinate, and the last, atra Macq., is unrecognizable. Hence the 

 generic name can only be a burden, and bad best he dropped. 



MSSOJI ETOPI 4 Lioy. 

 1864. Lioy Atti, Soc. Veneti., 79. 



" Front bare, without macrochretre, legs setulose. Wings ciliated 

 only at the base; marginal vein simple, reaching beyond the middle 

 of the wing, submarginal reaching to the apex of the wing; median 

 nervure straight." 



" The name refers to the bare front." 



"Type, L. nudifrons Macq." 



This genus is based upon an unrecognizable 1 species described by 

 Macquart, and as the characters do not apply in their entirety to 

 any present known species or group, it will have to be discarded, 



TRANS. AM. KNT. SOC. XXIX. (50) DECEMBER. !!)(« 



