Vol. xxixj ENTOMOLOGICAL NEWS. 14! 



Head prominent, yellow, the frons evenly convex, nearly as long as 

 broad, clothed rather densely with short, coarse, pale shining hairs ; 

 ocelli two, large and distinct, close to ocular margin. Eyes very 

 shortly hairy. Antennae slightly longer than the head and thorax 

 together, yellow at the base, shading to black beyond the fifth joint; 

 fifth joint about twice as long as wide. 



Mesonotum moderately convex, not prominent anteriorly, ocher- 

 yellow, opaque, slightly pollinose, clothed with shining rather short 

 hairs. Scutellum concolorous, with four long marginal bristles, the mid- 

 dle pair slightly longer than the outer ones. Postnotum brownish. 

 Pleurae pale blotched with brown. 



Abdomen dorsally dull ocher yellow and clothed with coarse and 

 rather sparse black hairs, the segments distally marked with blackish, 

 on the second segment all but a median triangle the apex of which 

 reaches its posterior margin ; on the succeeding segments the dark 

 color is less extensive, becoming indefinite on the distal ones. Venter 

 wholly yellow. 



Coxae very pale, all three pairs with a few coarse dark bristles dis- 

 tally. Femora pale yellow, the hind pair brown at extreme apex and 

 with a few long bristles. Tibiae pale at base, tinged with green and 

 becoming darker toward apices ; middle and hind pairs with three rows 

 of long black bristles on extensor surfaces; middle pair with three 

 bristles on flexor surface, the proximal one of which is much shorter 

 than the others; front tibiae shorter than first tarsal joint (20:24), 

 the spur slightly shorter than the tibia ; hind tibiae apically with a 

 comb of yellow bristles on inner side, the longest spur nearly equal 

 to first tarsal joint. Tarsi green, the crowded black setulae causing 

 them to appear blackish toward apices; hind tarsi with the first joint 

 distinctly shorter than the succeeding ones together (24:31). 



Wing uniformly tinged with greyish yellow, unspotted; veins strong, 

 brownish yellow ; petiole of medial fork very short, not quite equal to 

 the R-M cross-vein; base of cubital fork about as near wing-base as 

 the latter. Halteres pale. 



Length : Body about 3 mm., wing 2.5 mm. 



Porto Rico: Aibonito, 26 October, 1916, one male reared 

 from larva found on Inga laurina (R. H. Van Zwaluwen- 

 burg) ; Mayaguez, 9 July, 1917, one male reared from larva 

 from Eugenia jambosa L. (Van Zwaluwenburg) . 



Type: Cat. No. 21535, United States National Museum. 



This species is closely related to Mycetophila ancyliformans 

 Holmgren, and also to M. insipiens Williston (Trans. Ent. 

 Soc. London, 1896, p. 264) from the island of St. Vincent. 



