2,2^2 MAINE AGRICULTURAL EXPERIMENT STATION. I909. 



Head rounded, flattened in front; ocelli, 3, subequal, in a 

 triangle oli the front; palpi 4 jointed; antennae 2-)- 15 jointed, 

 the apical joint papilliform. Thorax ovate, arched. Abdomen 

 with 7 visible segments. Legs slender, femora somewhat thick- 

 ened; hind tibiae with 3 rows of delicate setae. Wings (fig. 91) 

 hairy, large, with wide base ; subcostal vein, long and ends in 

 the costa; subcostal crossvein (Sc=) present or absent; Ri end- 

 ing in the costa distad of the mid length of the wing; the radial 

 sector unbranched and ending in the costa before its tip; second 

 anal produced to the wing margin. 



Table of species. 

 a. Recent species. 



b. Subcostal crossvein wanting; apex of Ri far proximad 



of tip of Cui. Eastern States. i. ferrugiiiosa. 



bb. Subcostal crossvein present; apex of Ri opposite the 



tip of Cui. B. C. 2. borealis. 



aa. Fossil species. Colorado. terricola. 



I. Diadocidia ferrugiiiosa Meigen. 



1830. ferrugiiiosa Meigen, Syst. Beschr. VI. 294. 4. 



(Mycetobia) 



1831. flaz'icans Ruthe, Isis, II, 1211 (Diadocidia). 



1834. Wintheini Macquart, Suites a Buffon. I. 147. 34. 

 (Macroneura). 

 Male and female. Length 3 mm. Front, vertex, face and 

 antenna? brown, base of the last and proboscis and palpi yellow. 

 Thorax yellow, with 3 subcoalescent brown stripes, wanting in 

 immature specimens ; scutellum yellow ; metanotum brown. 

 Abdomen sordidly yellowish, darker apically. Legs yellow, tarsi 

 infuscated; fore metatarsus nearly 2-3 as long as its tibia, hind 

 tibia longer than the tarsus. Wing (Fig. 91) tinged with gray, 

 with pale brown veins and gray setulae ; subcostal crossvein want- 

 ing. Halteres yellow. Ithaca, N. Y., August 10; Auburndale, 

 Mass., July 16, (C. W. Johnson). Has also been recorded from 

 the White Mountains, New Hampshire. 



