268 Professor Willistou on the 



termination of first vein at some distance before the furcation of 

 the fourth ; prefurca of fourth vein about as long as the posterior 

 branch ; anterior branch strongly curved forward in its anterior 

 portion, as in species of Zygoneura. Length 2 mm. 



Eight specimens. There are not more than one or 

 two joints of the flagellum which are yellow in some 

 specimens ; apparently, also the number of white joints 

 at the tip may be limited to one. The humeri are some- 

 times red. The abdomen, when not drawn out, appears 

 almost wholly black in some specimens. 



Zygoneuea. 



Meigen, Syst. Beschr., vi., 304, 1830. 



1. Zygoneura sciastica, n. sp. (PI. VIII., figs. 24, 

 wing ; 24a, part of antenna.) 



$ . Dark brown, or blackish brown, opaque. Antennae as 

 long as the body, its pubescence in some reflection grey. Legs 

 luteous yellow ; tibiae infuscated ; tarsi blackish. Wings nearly 

 hyaline ; neuration as in the figure. Length 1-1|^ mm. 



One specimen. 



SIMULIID^. 



SiMULIUM. 



Latreille, Hist. Nat. Crust, et Ins., xiv., 294-, 1804. 



1. SimuUum tarsale, n. sp. (PI. VIII., figs. 25, 

 wing ; 25a, front tarsus of $ .) 



5 . Abdomen black, the proximal segments opaque, the distal 

 four segments shining. Length 2 mm. 



Front and face black, with a light grey reflection. Antennae 

 yellow ; the distal joints somewhat brownish. Mesoiiotum deep 

 black ; in front, opaque with a silvery shimmer, and with sparse, 

 short, curly, golden-yellow tomentum ; behind, shining. Pleurae 

 black, whitish pruinose. Abdomen black, the basal segments 

 opaque, the distal four segments somewhat shining, and with a 

 delicate whitish pruinosity. Legs reddish-yellow ; tarsi black, 

 except that the proximal half of the middle and hind metatarsi 

 light yellow ; first and third joints of the front pair each with two 

 long hairs ; second and third joints of the same pair dilated, the 



