WiLi.is'roN': TWO rkmarkahle new cexera ok diptera. 109 



between it and the complox joint of the Xylophai^'idae is one of 

 degree and not of kind. 



Arthrostylum fascipennis, n. sp, 



Male. h^ront and face both bare, the former opacjne brown, the 

 latter opaque light 3X'llow. Antennaf yellow': the first joint for the 

 most part, the upper margin of the second and third joints in part, 

 and the style wholly black. Occiput flat, gray pollinose on the sides. 

 Mesonotum shining reddish yellow, with three black stripes, which 

 are more or less confluent posteriorly. Pleurae black, scarcely 

 pollinose, yellowish in part above. Abdomen red; first (second?) 

 segment broadly black at its base, in front of which on either side 

 there is a yellow spot; the narrow distal end of the segment has a 

 rounded black boss above: third segment with a smaller blackish 

 eminence distall}'. Legs light yellow: the distal three joints of all 

 the tarsi, the hind femora except their tip, and the hind tibice 

 except base and tip, black: the tip of the second hind tarsal joint 

 is blackish. Wings yellowish hyaline, with two brown cross-bands, 

 the one running from near the costa, more narrowly behind, to the 

 tip of the anal cell: the other filling out the tip of the wing, slightly 

 concave on the proximal border, which crosses the third vein a 

 little before its furcation, and less deeply colored at the immediate 

 tip of the wing. Length 10-12 millim. (the abdomen is curvetl 

 downward ). 



One specimen, Xucumanatlan, Mexico, July (H. H. Smith. ) 

 Figures and full descriptions of both the above files, will short 1\- 

 appear in the Bio/oi^ia Ccnirali-Amrriiana. 



