902 CHARLES PauL ALEXANDER 
d. Rsjong; normal in) position: (cell (sii elongated 4. --.25..--- 25) see eee 8 
Rs shortened, its first fork with vein R2+; at an angle to the end of the sector so that 
cell {st R, is equilateral or nearly so............ Petites: Cryptolabis O. S. (p. 906) 
SF Rsren din gain iCall lesa ees pe he ee pe pe eg Molophilus TEE (p. eo 
Rs ending in cell! Rss i288 cota eo xe sas Cossig ee sino he see ae ee 
9. A supernumerary cross-vein in cell R2; second anal vein strongly bisinuate. 
Helobia St. Farg. (p. yee 
No supernumerary cross-vein in cell R2; second anal vein not bisinuate.............. 
10. Cu tending to turn toward the wing apex; forks of the longitudinal veins very ‘eae 
j Nae Lola sy eee areas sicatal ee RRR A RIO ears Gas eater eee eT Erioptera Meig. (p. 908) 
Cw straight or tending to turn away from the wing apex........................-. 11 
11. Sides of the long cell 1st M> parallel; Sc2 not far removed from the tip of Sc; coloration 
of the local species black; basal deflection of Cu: beneath the middle of cell /st M>. 
Gnophomyia O. S. (p. 909) 
Sides of cell 1st M2 more or less divergent distad; Sc. retreated toward the wing base 
so that Sc: is usually more than two-thirds the length of the sector.............. 12 
12. Deflection of Cu: meeting M far before the fork of the latter; Rs long and straight at its 
origin; the terminal three segments of the antennae abruptly smaller than the other 
segments of the flagellum; wings glabrous................... Trimicra O. 8. (p. 910) 
Deflection of Cu: meeting M usually at the fork or on M;+s underneath cell Ist M2; 
Rs shorter, tho straight; flagellar segments of the antennae gradually and uniformly 
smaller toward the tip of the organ; wings pubescent.........Ormosia Rond. (p. 911) 
Genus Chionea Dalman 
1816 Chionea Dalman. K. Vet. Akad. Handl., vol. 1, p. 102. 
Chionea is a peculiar genus of subapterous crane-flies. There are 
about five European and six American species so far described. The 
possible evolution of the group from winged ancestors (Pterochionea 
Alex., Crypteria Berg.) has been discussed by the author in another 
paper (Alexander, 1916:529-530). ; 
The immature stages of the known species are spent in the soil. The 
adult flies are usually found crawling about on the snow, being more 
conspicuous when snow is on the ground than at other seasons. In the 
spring and fall they are occasionally found in leaf mold. An interesting 
paper on the genus has been written by Johnson (1907). Dr. Dietz has 
in his collection a female specimen which was taken at Aweme, Manitoba, 
in September, when the temperature was below zero. 
All the earlier authors describe this fly as being wingless. This is not 
exactly true, however, the wings being present tho reduced to mere knobs, 
‘much smaller than the halteres. The generalized species have the normal 
number of antennal segments for this tribe of flies, this being sixteen — 
the two scapal segments, a basal fusion segment of the flagellum made 
up of five segments, and nine free flagellar segments beyond. In the 
