THe CRANE-Fiures oF New York — Part II 775 
especially of the setae on the cardines, are not the same. However, 
the generic characters given above include all the species to which the 
writer has been able to refer. 
Malloch (1915-17 b: 240-241) describes and figures an American Ptychop- 
tera which is presumably P. lenis O.S. It agrees closely with the cther 
forms in most respects. The author indicates the mentum as having 
three distinct parts, the median part being projected beyond the level of 
the lateral parts and having more teeth (eight instead of six). Malloch’s 
specimens were taken in the Yellowstone Park, Wyoming, in August, 
1890. From the locality data it is almost certain that the larvae belong 
to the common Ptychoptera lenis of the western United States. 
Tonnoir (1919) describes a curious sexual dimorphism in the genus 
Ptychoptera. 
Ptychoptera rufocincta O. §. 
1859 Ptychoptera rufocincta O.S. Proc. Acad. Nat. Sci. Phila., p. 252. 
The species Ptychoptera rufocincta is common around wet swales 
and among open shrubbery. The adult flies are on the wing from 
May to early July, and again in late August and early September; they 
may be double-brooded. In appearance they are conspicuously unlike 
their relatives of the Bittacomorphinae, rather resembling certain large 
fungus gnats (Mycetophilidae). 
The larvae live in situations similar to those frequented by Bittaco- 
morpha, and often occur in the same associations — with larvae of 
Iimnophila (Lasiomastix) macrocera, Pilaria tenuipes, P. recondita, and 
Erioptera chlorophylla, as well as with many Chironomidae, leeches, 
nematode worms, and mollusks. In appearance they are strikingly 
different from the larvae of Bittacomorpha, being pale, white or yellowish 
white, with the body almost smooth, not covered with the dense trans- 
verse rows of setiferous tubercles found in Bittacomorpha, and with the 
pseudopods on the basal abdominal segments poorly developed. The 
larvae of this species are smaller than those of Bittacomorpha, with the 
head proportionately much smaller. In structural details, however, 
they are rather similar to the larvae of Bittacomorpha. The larvae of 
Ptychoptera rufocincta feed on the decaying vegetabie matter in their 
haunts. When fully grown, the pupa forms within the last larval skin, 
and the elongate pupal spiracle is coiled about the mesothorax, as described 
