THE MYCETOPHILID.^i OF NORTH AMERICA. 243 



I. Apeinon gracilis Williston. 



1893. gracilis Williston, Kas. Univ. Quarterly II. 60 



(Platyura). 



Male. Length 6 mm. Antennse black, much shorter than 



the thorax; first 2 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 blackish. Tibiae somewhat 



infuscated by the minute black hairs; tarsi blackish. Wings 



with a strong yellow or brownish tinge, the extremity with a 



blackish cloud ; subcostal vein very short, terminating before 



the origin of the radial sector, the subcostal crossvein at about 



its middle; R2+3 at some distance before the tip of Ri; third 



anal vein wholly wanting. Washington. 



2. Apemon pectoralis Coquillett. 

 1895. pectoralis Coquillett, Canad. Entomol. XXVII. 199 



(Platyura). 



Female. Length 12 mm. Front, occiput and antennae, black; 

 first 2 joints of the latter, the face, cheeks and mouth parts, 

 yellowish. Thorax and scutellum reddish-yellow,* pleura and 

 metanotum bluish-black. Abdomen reddish yellow, the first 

 segment black, the second 3 times as long as broad. Halteres 

 yellowish. Coxae and femora reddish yellow, tibiae brownish- 

 yellow, tarsi black. Wings yellowish-grey; a brown spot 

 extends from the costa before the tip of Ri to posterior branch 

 of the media near its base ; apex of wing from midway between 

 tips of Ri and Ri+s to apex of anal vein, grayish-brown; a 

 brown cloud on the radial sector near its base; tip of subcostal 

 vein opposite base of the radial sector, subcostal crossvein 1.5 

 times the length of the humeral beyond the latter ; R=+3 oblique, 

 ending twice its length before the tip of Ri ; anal vein reaches 

 the wing margin. Nevada. 



Several male specimens taken by Prof. Aldrich in June at 

 Grangeville and Moscow, Idaho, differ as follows: the brown 

 cloud on apex of wing (fig. 88) less extended; the subcosta 

 ends distad of the base of the radial sector, R:+3 is nearly per- 



