DIPTERA. 221 



3. Mycetophila ? 



c? . Head, mesonotum, and abdomen opaque black ; pleura? in part, coxse, venter, and legs yellow ; tibiae and 

 tarsi brownish. "Wings yellowish, uniform ; prefurca of the fourth vein about twice the length of the 

 cross-vein ; anterior furcation opposite that of the posterior forked cell. Front femora shorter than their 

 tibiae and less than half the length of the metatarsi. Length 2£ millim. 



Eab. Mexico, Omilteme in Guerrero 8000 feet (E. E. Smith). 



SCIABA (p. 1). 



Sciara americana (p. 1). 



To the localities given, add : — Mexico, Xucumanatlan, Venta de Zopilote, Kincon, 

 and Omilteme in Guerrero, Teapa in Tabasco, Orizaba (E. H. Smith), Santiago 

 Iscuintla in Jalisco (Schumann), 



Numerous specimens. 



BIBIONIDiE (p. 2). 

 PLECIA (p. 2). 



Plecia plagiata (p. 2). 



To the localities given, add : — 'Mexico, Vera Cruz (Schumann), Teapa in Tabasco 

 (E. E. Smith). 

 Three specimens. 



l (a). Plecia nigerrima. 



Plecia nigerrima, Bellardi, Saggio etc. i. p. 14 \ 



Bab. Mexico (Salle x ), Omilteme in Guerrero 8000 feet, Cuernavaca in Morelos, 

 Mexico city, Teapa in Tabasco (E. E. Smith), Orizaba (E. H. Smith & F. D. Godman), 

 Morelia in Mexico (F. D. Godman), Orizaba and Meztitlan (Saussure 1 ). 



Seventeen specimens, agreeing fully with the short description. The anterior branch 

 of the third vein is long and very oblique, being fully as long as the first section of the 

 third vein. The anal cell is closed. P. nigerrima was unknown to Osten Sacken, who 

 placed it in his list of unidentified Mexican Bibionidse (antea, p. 5). 



Plecia ruficollis (p. 3). 



To the localities given, add : — Mexico, Atoyac in Vera Cruz, Venta de Zopilote in 

 Guerrero, Teapa in Tabasco (E. E. Smith). 



Four specimens. 



