168 KANSAS UNIVERSITY SCIENCE BULLETIN. 



opposite these in the submarginal cell in a large hyaline spot, 

 containing a fuscous dot, dividing on entering the first posterior 

 cell into two branches, the distal one ending at the hind cross- 

 vein, the first branch is very irregular in the discal cell, crosses 

 the fifth vein just in front of hind cross-vein, then passes for a 

 short distance toward base of wing ; apically the submarginal 

 cell contains three hyaline dots, the first posterior cell five, the 

 second posterior cell three, and the third posterior cell four 

 besides the ones above mentioned. Length, 7 mm. 

 One specimen ; November. 



RiVELLIA. 



(R. Desvoidy, Myod., 729; 1830.) 



Rivellia major, n. sp. 



Female : Yellow, with black bristles and pile. Front plane, 

 brownish yellow in the middle, with small black hairs most 

 conspicuous on anterior part, orbits light yellow ; ocellar bris- 

 tles very minute, a fronto-orbital bristle opposite the lower 

 ocellus, a pair of verticals and postverticals present; antennae 

 long, yellow, third joint acuminate, tip brownish, arista like- 

 wise ; face yellow, with a median brownish stripe, gently con- 

 cave ; occiput and cheeks yellow, latter with a few short black, 

 bristly hairs ; mouth-parts yellow, palpi with a few short black 

 hairs. Thorax yellow ; mesonotum and scutellum reddish 

 yellow, a humeral, two posthumeral and two supraalar bris- 

 tles, scutellum with two pairs of bristles; halteres yellow. 

 Abdomen light yellow, dorsum of first three segments reddish 

 yellow ; on the posterior margin of the third segment is a row 

 of rather long black bristles ; ovipositor shining black. Legs 

 yellow, tarsi brownish black. Wings hyaline ; the costal mar- 

 gin to the tip of the fourth vein is fuscous, a short indistinct 

 fascia from tip of first vein to small cross-vein, another one 

 from just before tip of second vein and passing over posterior 

 cross-vein to hind border of wing, fuscous. Length, 5.5 mm. 



Two specimens ; October. 



