SUPPLEMENT*. 



MYCETOPHILIDiE (p. 1). 



PLESIASTINA. 

 Plesiastina, Winnertz, Stett. ent. Zeit. p. 55 (1852). 



l. Plesiastina bifasciata, sp. n. (Tab. IV. figg. l, la, <$ .) 



J . Head yellow, the ocelli on small blackish spots ; antennae longer than the head and thorax together, light 

 yellow, the last seven joints black, the flagellum flattened. Mesonotum light yellow, with three broad 

 shining black stripes, the lateral ones abbreviated in front. Scutellum yellow, with the margin brownish. 

 Pleurae in part pitchy brown. Metanotum light yellow above, brown on the lower part. Abdomen : first 

 segment and the venter light yellow ; second to seventh segments, inclusive, shining black, with the hind 

 margin yellow or yellowish, and clothed with yellow hair; remainder of abdomen black, with less 

 abundant yellow hair ; hypopygium yellow, with the superior organs blackish. Legs yellow ; four 

 posterior coxa? brownish ; hind femora, tip of the hind tibia?, the hind tarsi, and the tip of the middle 

 tibia? black ; middle tarsi brownish ; front tibiae with weaker bristles ; all the tibiae with spurs, the hind 

 pair with long and stout ones. Wings light yellow, with brown markings as follows : the whole of 

 the costal cell, except sometimes a spot at the beginning of the yellow distally, the broad distal and 

 narrow posterior margin, and a moderately broad band near the middle of the wing ; the auxiliary 

 vein vanishes in a fold that ends about opposite the beginning of the third vein ; the third vein forks 

 before its middle, the fourth a little beyond the middle of the second section of the third ; the costal vein 

 ends at the tip of the posterior branch of the third. Length 6^-7 millim. 



Hab. Mexico, Sierra de las Aguas Escondidas in Guerrero 7000 feet (H. H. Smith). 

 Three specimens. 



MACROCERA. 



Macrocera, Meigen, in Illiger's Magazin f. Ins. ii. p. 261 (1803). 



1. ILacrocera eoncinna. 



Macrocera eoncinna, Willist. Trans. Ent. Soc. Lond. 1896, p. 255, t. 8. f. 7 \ 



Hob. Mexico, Chilpancingo in Guerrero 4600 feet (H. H. Smith). — Antilles, 



St. Vincent 1 . 



A single specimen. It differs somewhat from the Antillean types in the coloration 



* Since the publication of Baron C. R. Osten Sacken's enumeration of the species of the Families of 

 Diptera dealt with in this Volume, whose last contribution was issued in April 1887, we have obtained a 



biol. centr.-amer., Dipt., December 1900. 2/ 



