THE CANADIAN ENTOMOLOGIST. 341 



into a long arm chitinized, its apex blunt but slightly notched. 

 Ventral aspect, 9th tergite almost straight on caudal margin ; pleurae short, 

 the inner caudal angle produced into a long appendage, which is tufted 

 with yellow hairs at its tip ; guard of the penis long, enlarged basally, 

 projecting slightly beyond the apices of the pleural appendage ; ventrad 

 of the pleural arm is a slender acicular appendage. 



Holotype.— (^ . Totonicipan, Guatemala, 1902. (Dr. G. Eisen.) 

 Allotype. — ? . Antigua, Guatemala. (Dr. G. Eisen.) 

 Paratypes. — ^ ^. Totonicipan, Guatemala. (Dr. G. Eisen.) 

 Types in U. S. Nat. Mus. coll, (No. 15,135). One paratype in 

 author's collection. 



Like Uberta O. S. (Proc. Acad. Nat. Sci. Phil., 1859, p. 209; Mono- 

 graph Dipt. N. Am., Vol. 4, p. 69), of the Eastern U. S., but larger, the 

 mesothoracic praescutum browner and the stripes indistinct. In Uberta 

 the ^ genitalia (fig. u) consists of short pleurae, the swollen ventral lobes 

 produced entad in a blunt knob, which bears two conspicuous caudad- 

 projecting spines at its tip, the ventral one very stout, spine-like, the 

 dorsal one more slender. In knabi the pleurae are longer, the lobes short, 

 the ventral one produced into a long arm, which is slightly notched 

 apically. 



Explanation of Plate XI. 

 Wing of Furcomyia andicola, sp. n. 

 " F. insignifica^ sp. n. 



'' F. gioriosa, sp. n. 



" F. argefitina, sp. n. 



" F. liberoides, sp. n. 



" F. knabi, sp. n. 



" F. simi//ima, sp. n. 



" F. o?fi!ssa, sp. n. 



" F. reticulata, s p. n. 



" F. _^ osier houti, sp. n. 



" F. transliicida, sp. n. 



" F. eisen i, sp. n. 



" ? ^ fumosa, sp» n. 



Hypopygium of i^ Uberta Osten Sacken. 

 v = ventral apical appendage. 

 d = dorsal apical appendage. 

 Hypopygium of F. liberoides, sp. n. 

 " F. knabi, sp. n. 



(To be continued.) 



