58 Psyche [April 



myza en America" by Felix Lynch Arribalzaga, in the Anales de 

 la Sociedad Cientifica Argentina, xxxiv., pages 253 to 301. 



The subgenus Sapromyza is our dominant group. The species 

 may sometimes be difficult to place correctly in a tabulation 

 since their yellow color may change at death. Where confusion was 

 most obvious the species have been several times included in the 

 key. Spottings of the abdominal segments may become vague 

 through a darkening of the general color. Again, there is some 

 variation in the extent of color markings ; as, for example, univittatay 

 aveola, and vinnula, probably varieties of a single species, show 

 gradations in the extent of the mesonotal stripe, etc. Flavipennis 

 Fabricius, with bare arista, is not the same species as flavipennis 

 described by Wiedemann, although Wiedemann's specimens came 

 from Fabricius' collection. 



The following description of a new genus of Sciomyzidse is in- 

 cluded in this paper, since it deals ^vith a species hitherto classed as 

 a Sapromyza. 

 PCECILOMYIA: A New Genus of Sciomyzid^. (Figs. 1 and 2.) 



In a note in connection with the original description of Sapromyza 

 decora, Loew stated that the shape of the head and particularly 

 of the antennae was very much like that of certain Tetanoceras, 

 in view of which the species should be separated from Sapromyza 

 as a distinct genus. Not recalling this note when studying speci- 

 mens of decora I came independently to the same conclusion, and 

 coincidentally received a letter from Mr. C. W, Johnson conveying 

 the same suggestion. 



Decora is an unusually distinct species, with its reticulate wings 

 and maculate body. It clearly is not a Sapromyzine because of 

 the following array of characters. These characters are invariably, 

 or at least usually, associated with the Tetanocerine Sciomyzidse 

 and are not at all, or at most very rarely, found in the Sapromyzidse. 



Front broadly convex, the periorbits separated from the unusually broad, shin- 

 ing, central part by a strong suture; face strongly concave, the oral margin project- 

 ing, but the clypeus (Chitinhufeisen) rudimentary; cheeks nearly as deep as the 

 eye-height; postvcrtical bristles divergent; second antennal joint elongate and 

 bristly; the third joint triangular, pointed, excised above; palpi long and linear; 

 thorax vdth a fine scabrous coating; prothoracic, mesopleural, and stemo-pleural 

 bristles all wanting; front femora without a series of bristles on posterior flexor 

 edge; middle tibiae without preapical spur but with apical crown of bristles; wings 

 with complete anal vein. 



