8 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 80 : art. 20 



stood, and its type species griscscens Kobineau-Desvoidy is the species 

 which has been known in recent literature as Masicera senilis ISIeigen 

 (and which should be known as Lydella grisescens Robineau-Des- 

 voidy, since the true senilis of Meigen is an entirely different species). 

 There appears to be no earlier generic name for what has been called 

 Lydella than Anetia, and Doctor Townsend in a recent letter advises 

 me that he adopts this. 



The striking genitalic characters of the females, with piercer and 

 stubby ventral abdominal spines, imply such biological difference that 

 they should if possible be recognized as generic, although I readily 

 admit that it is difficult to separate the males of these species from 

 those in which the females do not have a piercer. A. dimviocki dif- 

 fers from the type of Anetia^ Tachina nigripes Zetterstedt, a Euro- 

 pean species represented in the National Museum by several speci- 

 mens of both sexes indentified by Villeneuve, Bezzi, and Nielsen, 

 chiefly in lacking the tuft of minute setules underneath the calypter 

 (a single distinct setule is present in one male from La Fayette) ; 

 nigripes also has several large bristles on the outer front side of the 

 middle tibia, not usually regarded as generic. A. dimmocki fits bet- 

 ter here than in Dexodes Brauer and Bergenstamm (in which I 

 would include as synonyms Paranieigenia Townsend, Paradexodes 

 Townsend, and Auhaeanetia Townsend), as the latter has no piercer 

 in the female. 



U. i 60VERNMENT PRINTINS OFFICEi I9>t 



