the: MYCETOPHILID.^]; OF NORTH AMERICA. 235 



of the mesonotum narrowly yellowish as well as the sides of the 

 scutellum. Abdomen and hypopygium black, the superior 

 forceps slender, the inferior pair broad, neither very prominent. 

 Coxje and legs yellow, trochanters, tibial spurs and tarsi black- 

 ish; fore metatarsus .8 as long as its tibia. Wing subhyaline, 

 slightly more cinereous apically. Halteres yellowish, knob 

 fuscous above. Recorded from Hudson Bay Territory. I 

 have a specimen from jMontreal. 



3. Asiiidulitni flavum Winnertz. 



1846. Havuni Winnertz, Stett. Ent. Zeit. VII. 17. 



(Macrorrhyncha) . 



Male and female. Length 4 to 5^ mm. Face, epistome, 

 labellje, lower front, base of antennae, and occiput yellow; 

 proboscis and remaining parts of the head black. Thorax 

 yellow with 3 pale brown, sometimes obsolescent, stripes; 

 scutellum with black hairs. Abdomen of the male with basal 

 segments yellow, apical segments brown to black, hypopygium 

 black; of the female yellow, anterior margin of each segment 

 with a brown transverse fascia, terminal segments usually 

 black; in immature specimens the fascia are obsolete. Coxae 

 and femora pale yellow ; tibije pale brown ; tarsi, spurs and 

 setae of tibiae, brown ; fore metatarsus % as long as its tibia. 

 Wing yellowish. Halteres whitish. The larvre have been 

 found in decaying wood. I have seen a specimen from New 

 Hampshire. 



2. Genus Ccroplatus Bosc. 



Ceroplatus, Bosc. Act. Soc. Hist. Nat. Paris I. i. 42. 1792. 



Head small, ovate ; three ocelli arranged in a transverse 

 curved line; palpi (fig. 47) not incurved, 3 or 4 jointed; 

 antennae shorter than head and thorax taken together, very 

 broad and flat, compressed, strap-like, 24-14 joints, the inter- 

 mediate joints much broader than long (fig. 48). Thorax 

 ovate; abdomen with 7 visible segments. Legs long, lateral 

 setae of tibiae either absent or very minute. Wings (fig. 82) 

 shorter than the abdomen; costa produced beyond the tip of 

 Ri+s but ending before the tip of the wing; subcosta ends in 

 the costa; subcostal crossvein, when present, basal in position; 

 R=+3 ends in Ri ; media with a short petiole ; anal vein pro- 

 duced to the wing margin. 



