6o williston: new diptera. 



the origin of the third vein; the anterior branch of the third vein joins 

 the costa just beyond the insertion of the first vein; seventh vein 

 complete. 



Length, 8 mm. 



One specimen, Washington, University of Kansas. 



Platyura gracilis, n. sp. 



Male. Antennae black, much shorter than the thorax; first two 

 joints yellowish. Head yellow, the vertex blackish. Thorax, coxae 

 and femora yellow; the mesonotum more reddish, with a fringe of 

 black hairs above the root of the wings. Abdomen slender, not 

 shining; yellow, the anterior portion of each segment brown or black- 

 ish. Tibiae somewhat infuscaled by the minute black hairs; tarsi 

 blackish. Wings with a strong yellow or brownish tinge, the extremity 

 with a blackish cloud; auxiliary vein very short, terminating before 

 the origin of the third, the subcostal vein at about its middle; anterior 

 branch of the third vein at some distance before the tip of the first; 

 seventh vein wholly wanting. 



Length, 6 mm. 



One specimen, Washington, University of Kansas. 



Necglaphyroptera striata, n. sp. 



Male. Head yellow, the occiput somewhat brownish; antennae 

 brown, the basal joints yellow. Thorax yellow; mesonotum with four 

 brown stripes, the median ones narrower, narrowed posteriorly and 

 separated by a slender line, the lateral ones abbreviated in front; 

 metanotum brown; bristles of the mesonotum well developed, as are 

 also those of the trichostical row. Abdomen black, the anterior part 

 of the segments yellow or brown. Legs yellow; tip of the hind femora 

 and tibiae and all the tarsi brown; front metatarsi as long as the 

 tibiae; middle and hind tibiae with bristles on the outer side. Wings 

 yellowish hyaline: an irregular brown band across the outer part, and 

 brown spots on the cross-veins and on the sixth vein; seventh vein 

 incomplete; the auxiliary vein terminates about opposite the furcation 

 of the fifth and sixth veins, and the subcostal cross-vein is situated 

 beyond its middle; anterior cross-vein longer than the last section of 

 the first vein. 



Length, 5 mm. 



One specimen, Washington, University of Kansas. 



Limnobia concinna, n. sp. 



Male. Head and pal])i deep brown or blackish, the rostrum more 

 reddish; occiput and vertex grayish dusted. Antennae deep brown, 

 the basal joints scarcely at all reddish. Thorax deep brown, gray 



