32 Journal Xew York Entomological Society. [Vol. xix. 



Genus MICROCERATA Felt 1908, type Micromyla corni Felt. 

 Antennre greatly reduced, only 8 to 10 segments, the second greatly 

 enlarged, globose, the two branches of the fourth vein nearly even. 

 North America. 



Genus TRITOZYGA H. Lw. 1862, type T. sackcni n. sp.* 

 Male. — Antenna" short. 9 segments, the second ovate, the fourth with a 

 length a little greater than its diameter ; terminal segments compound, formed 

 by the fusing of three segments. Palpi probably quadriarticulate, the third 

 and fourth each with a length about four times its diameter. Wings as figured 

 by Loew. Tarsi quinquearticulate, the first longer than the second. Type in 

 the Museum of Comparative Zoology. 



Distinguished from the above by the asymmetrical branches of 

 the fourth vein. North America. 



Genus LITHOMYZA Scudd. 1877, type L. cotdiia Scudd. 

 Fourth vein forked as in Lcstrcniia. Antenna; with 9 seginents. 

 A fossil form evidently having a close affinity to the two preceding 

 genera. Fossil, North America. 



Tribe CAMPYLOMYZARIJE. 

 This tribe is separated from the preceding by the simple, nearly 

 obsolescent fourth vein or its absence. 



Genus STROBLIELLA Kieff. 1897, type 5'. intermedia Kieff. 

 \\'ing"less, or if wings are present, the fifth vein simple. Claws 

 with long, parallel teeth, the pidvilli very short. Europe. 



Genus WASMANIELLA Kieff. 1897, type W. aptcra Kieff. 

 Female wingless. Distinguished from the preceding genus by the 

 denticulate claws and the rudimentary or obsolescent pulvilli. Europe. 



Genus JOANISSIA Kieff. 1894, type /. aurantiaca Kieff. 

 Third vein usually well separated from costa and frequently unit- 

 ing therewith at or beyond the apex; fourth vein present. Antennal 

 segments 14 in the male. 11 in the female, globose, stemmed and orna- 

 mented only with irregtilar whorls of long hairs. Palpi tri- or qttad- 

 riarticulate. Europe, North America. 



Genus PEROMYIA Kieff. 1894, type P. leveillei Kieff'. 

 Distinguished from the above by the 14 antennal segments of the 

 male, the 13 in the female and the biarticulate palpi. The claws are 

 strongly bent and dilated subapically. Europe. 



* Tritozyga sackeni, new species. 



