DIPTERA— CECIDOMYID^. 601 



beneath it in Anarete is absent from Lithomyza. The tibiae are destitute ol" 

 spurs, but furnished with a posterior row of slight, recumbent spines. 



Lithomyza condita. 



PL 5, Figs. 34-36. 



Lithomyza condita Scudd., Bull. U. vS. Geol. Geogr. Surv. Terr., Ill, 746(1877); in Zittel, Handb. d. 



Palii'ont. I, ii, 812, Fig. 1089 (1885). 



Represented by a single specimen in an unusually perfect condition, 

 although somewhat indistinct. The joints of the antennae are difficult to 

 determine, but with little doubt are nine in number ; although short, they 

 are not so abbreviated as in Anarete, the joints being twice as long as 

 broad ; toward the tip, they grow smaller. The legs are long and bristly. 

 The fork of the third longitudinal vein is at the center of the wing, and 

 nearer the base than the extremity of the first longitudinal vein. There is 

 a faint indication of a transverse vein between the first and second longi- 

 tudinal veins, about midway between the fork of the third longitudinal vein 

 and its separation from the second. There is also a faint and very doubt- 

 ful indication of an. oblique cross- vein just beyond the transverse vein men- 

 tioned, running from the first longitudinal vein to the costa. 



Length of body, 2.7°""; of antennae, 0.75"""; of wings, 2™"'; fore legs, 

 0.7(?)'""'; middle legs, 2"^"' ; hind legs, 2.4-"™; hind tibia?, aoG""; hind 

 tarsi, 1.28""'. 



Chagrin Valley, White River, Colorado. One specimen. (W. Denton.) 



