906 CHARLES PauL ALEXANDER 
Genus Cryptolabis Osten Sacken 
1859 Cryptolabis O. 8. Proc. Acad. Nat. Sci. Phila., p. 224. 
Cryptolabis is a small but well-defined genus, including three species, 
of which two are Nearctic and one is Neotropical. Nothing is known 
of the immature stages, but those of C. paradoxa, at least, are probably 
spent in moist earth. 
Cryptolabis paradoxa O. 8. 
1859 Cryptolabis paradora O. S. Proc. Acad. Nat. Sci. Phila., p. 225, pl. 4, figs. 14 
15, 15a. 
, 
The species Cryptolabis paradoxa, a curious little fly, is dark brown, 
with the dorso-pleural membranes and the root of the wings more yellowish; 
the whitish wings, with the apical cells pubescent and the sector short and 
straight or even slightly convex (Plate XX XVII, 101), easily distinguish 
the species. It is often rather common on rank herbage growing along 
wide creeks or on river banks. In these situations it may be swept in 
numbers from late June thruout July. 
Genus Molophilus Curtis 
1833 Molophilus Curt. Brit. Entomol., p. 444. 
The genus Molophilus includes about forty-five described species, 
found in most parts of the world but better represented, apparently, 
in the temperate regions of both hemispheres. The immature stages so 
far as known are spent in moist earth. 
The local species of Molophilus may be separated according to the 
following key: 
1. Size very small, wing about 2.5 mm.; basal deflection of R2+s3 short, perpendicular, about 
as long as the radial cross-vein; basal deflection of Cu far before the fork of M. 
[Erioptera ursina O. S. Proc. Acad. Nat. Sci. Phila., p. 228. 1859.] (Plate XXXIV, 
OI eee SCONE TE Sie A ree UMAGA Ra SUR c/s MN Le CUAL M. ursinus (O. S.) 
Size larger, wing over 2.6 mm.; basal deflection of &:+; longer, oblique; basal 
deflection of Cu near the fork of M (asin M. nova-caesariensis) or beyond it on M3+4.. .2 
. Wings with a brown spot on the basal deflection of Ms. [Hrioptera comata Doane. Journ. 
N. Y. Ent. Soc., vol. 8, p. 188, pl. 7, fig. 20. 1900.] (Plate XXXIV, 69.) 
M. comatus (Doane) 
Wings without such ajlorowmi spot. Ney aiae oye Gls yes aeyva aoe ele ete eee eee eee 3 
3. Antennae of the male elongated; coloration largely yellowish......................... 4 
Antennae short in both sexes; coloration brown or blackish. ........... 000.00 cece ee 5) 
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