Z DIPTERA. 



S. atra, Macq., amongst the species occurring in the Argentine Republic, but he 

 considers it distinct from S. americana (cf. Arrib. Catalogo &c. p. 118). 



2. Sciara gigantea. 



Sciara gigantea, Macq. Dipt. Ex. Suppl. i. p. 19. 

 Hah. Guatemala, San Juan in Vera Paz (Champion) ; Costa Rica, Irazu [Rogers). 



The two Irazu specimens were taken in copula. 



Besides these two species, only four Mycetophilidae have been recorded from Mexico, 

 and none from other parts of Central America : — 



Leja punctata, Bellardi, Saggio &c. Append, fig. 3. 

 Sciophila popocatepetli, Bellardi, Saggio &c. i. p. 11. 

 Sciara unicolor, Say, Compl. Wr. ii. p. 251. 

 rotundipennis, (Macq.'?) Bellardi, Saggio &c. i. p. 13. 



Fam. BIBIONIDJE. 



PLECIA. 



Plecia, Wiedemann, Aussereur. zweifl. Ins. i. p. 72 (1828). 



1. Flecia plagiata. 



Plecia plagiata, Wiedem. Aussereur. zweifl. Ins. i. p. 75 ; Schiner, Reise d. Novara, Zool. iii. Abth. 



i. p. 22. 

 Plecia heteroptera, Macq. Dipt. Ex. Suppl. i. p. 21, t. 2. f. 10, ? (apud Schiner). 

 Plecia vittata, Bellardi, Saggio &c. App. 7, f. 4, $ (apud Schiner). 



Ilab. Guatemala, San Geronimo (Champion) ; Nicaragua, Chontales (Janson) ; 

 Panama, Bugaba (Champion). — Colombia. 



That the specimens before me belong to P. vittata, Bellardi, seems certain; that 

 P. plagiata, Wiedem., is the same as P. heteroptera, Macq., rests on the authority of 

 Schiner, who compared an author's type of P. heteroptera with the type in Wiedemann's 

 collection. In the short description of P. heteroptera Macquart says: — "like plagiata \ 

 second posterior cell closed." The latter is an inaccuracy of expression; Macquart 

 meant the marginal cell. P. similis, Rondani (Ann. Bol. 1850), may perhaps likewise, 

 belong here. — Eleven specimens, including both sexes. 



2. Flecia rostellata. 



Plecia rostellata, Loew, Berl. ent. Zeit. 1858, p. 109, t. 1. f. 11 (wing). 



Plecia rostrata, Bellardi, Saggio &c. i. p. 15 [apud Schiner, Reise d. Novara, Zool. iii. Abth. i. 

 p. 21]\ 

 Eab. Mexico x ; Nicaragua, Chontales (Janson). 



The synonymy adopted by Schiner seems very probable ; he is right in observing that 



