Vol. XXX ] ENTOMOLOCir AT, XF.WS. 139 



doubtedly congeneric. Becker makes the genus out as a per- 

 fectly good one, differing from Astcia chiefly in having a hind 

 crossvein and a longer (normal) second vein, and lie places 

 it in Drosophilidae next to that genus. From the material 

 ( Xorth American) that I have seen, I entirely agree with this; 

 we have a genus still more nearly related. Slcialocssa, which 

 possesses a hind crossvein, hence differs hardly at all except in 

 its greatly shortened second vein. 



Czerny in 1903 gave some notes on a speciment of scaiopha- 

 </ina in Zetterstedt's collection, including additional generic 

 characters. This species is strictly congeneric with the other two, 

 if not in fact an earlier name for glabricula. Meigen in the 

 original description of laevigata suggested that it might he 

 only a variant ( Abanderung) of ylabricnla. As no valid des- 

 ignation of a genotype has been made, glabricula is hereby 

 designated. 



Williston in 1896 (a) reported the genus from North Amer- 

 ica and placed it in his table of Agromyzidae (i896b) ; but in 

 1908 he omitted it, evidently not satisfied with his identification. 



Melander in 1913, in his exhaustive treatment of Agro- 

 myzidae and related families, mentions Leioiiiyrja as a genus 

 unknown to him. 



Lorenz Oldenberg in 1914 gives generic characters from 

 numerous specimens and from Becker and Czerny. He finds 

 the flies in the forest in Germany on exuding sap of trees, on 

 tree fungi, and on boards in the sun. His specimens show 

 considerable variation in the amount of infuscation of the 

 front, antennae and femora, but seem to agree with laevigata. 



With this historical review, I proceed to a description of 

 the genus and two new North American species. 



GENERIC CHARACTERS. 



Head nearly hemispherical, concave behind, the eye very 

 large, bucca and para facial extremely narrow. Antennae or- 

 dinary, inserted at about the middle of tin- li-.-ad in profile. 

 arista bare or slightly pubescent. Face short, not carinale ; 

 a minute pair of vibrissae present. Front and face of e<|ual 

 width, less than one-third that of head; front flat, smooth, or- 



