THE MYCETOPHILID.E OF NORTH AMERICA. 273 



and extending nearly to the base of the wing, a large oval spot 

 just below this, the ventral margin of the pleura just above the 

 middle coxje and the metanotum ; the two longitudinal rows of 

 fine setae on the mesonotum mesad of the longitudinal stripes, 

 two rows of larger setse extending to the base of the wing, sev- 

 eral pairs on the jDosterior margin, and a few less prominent 

 ones on the scutellum, black. Abdomen yellow, the first seg- 

 ment pale brown, both dorsal and ventral sclerites of the other 

 segments each with dark brown basal fascia about half the 

 width of the segments anteriorly but wider on the posterior 

 segments, the dorsal sclerites also with pale brown apical fasciae; 

 hypopygium brown (fig. 94) the two apical teeth far apart; 

 setae black. Coxae and legs yellow, extreme apex of each femur 

 and tibia, and the tarsi wholly infuscate; fore metatarsus two 

 thirds, second foretarsal joint one-third as long as the tibia ; 

 tibial spurs about as long as the fourth tarsal joint; empodium 

 distinct, bushy, claws simple. Wings hyaline with a brown, 

 more or less broken zig-zag fascia which arises proximad of 

 the apex of Ri, extends over the petiole of the media, produced 

 slightly into its fork, narrows behind Cui and reaches Cu= where 

 it again slightly widens; a spot at the base of the media which 

 may extend to the cubitus, another at the base of the cubitus, 

 and the entire apex of the wing from the apical half of cell 

 Ri-^s to beyond Cui with a very faint brown cloud, more con- 

 spicuous along the course of the veins ; R;-t-3 very oblique and 

 about as long as the petiole of the media ; the distance from the 

 tip of Ri to R-+^ is about three-fourths as great as from R^-I-j 

 to Ri+=. Halteres yellow. 



Female. Like the male but the antennae are a trifle shorter, 

 the yellow of the dorsal sclerites of the abdomen is less extended 

 and the apex of the wing is a little darker. All from Tthaca. 

 New York ; June. 



EEC measurements'. 

 The table which follows gives the relative lengths of the joints 

 of the legs, the fore tibia being taken as 100. As the measure- 

 ments were for the most part made upon pinned specimens the 

 values given may not be absolutely exact, due in part to the 

 difficulty experienced in getting the object to be measured in a 

 true horizontal plane. A variation of as much as four or five 

 percent, may be expected in different individuals of the same 

 species, and the proportions in the male differ somewhat from 

 those of the female. 



