THE CANADIAN ENTOMOLOGIST 209 
the subgenus (L. harberi Alex.) in its larger size and different 
coloration. 
Tribe Pediciini. 
Genus Tricyphona Zetterstedt. 
Tricyphona degenerata, sp. n. 
Cell 1st Ah of the wings open by the atrophy of the outer 
deflection of vein Ah; wings small, somewhat degenerate, in the 
male less than 5 mm. in length. 
Male. — Length about 4.8 mm ; wing 3.8 mm. 
Head lacking in the type. 
Prcnotum light yellow. Mesonotum yellowish, the prfescutum 
with a broad, dark brown, median stripe and shorter lateral stripes 
that continue back on to the anterior half of the scutal lobes; 
scutellum and the remainder of the scutum yellow; postnotum 
with a very sparse, grayish pruinosit>\ Halteres pale, the knobs 
a little darkened. Legs with the coxa^ elongated, dull yellowish; 
trochanters yellow, the margin at the junction with the femora 
darkened; femora and tibia? brownish yellow, the tips of the latter 
narro^^ly darkened; last two tarsal segments and the claws dark. 
Wings long and slender, small, degenerate, although with a com- 
plete venation; pale yellowish subhyaline, the veins yellowish 
brown; stigma indistinct. Venation (fig. 11) Rs angulated at its 
origin; cross-vein r about two-thirds the length of that portion 
of Ri beyond it; petiole of cell Ri longer than the r-m cross-vein; 
forks of M subacute; cell 1st Ah open by the atrophy of the outer 
deflection of Ads. 
Abdomen dark brown, the hypopygium more reddish brown. 
Holotype, &, Geneva Park, Grant, Colorado, altitude 9,500- 
10,000 feet, July 22, 1916, (E. C. Jackson). 
The only other Tricyphona in the Nearctic fauna with the 
cell 1st Ah open by the atrophy of the outer deflection of vein 
Mz. is T. aperta Coq. (fig. 10), a full-winged fly that is much 
larger than our present species. A comparison of figures 10 and 
11 will show the chief dift'erences between the species. The con- 
dition in the present species is one of degeneration, the wing 
measuring but 3.8 mm.; the even more degenerate T. hannai 
Alex. (Pribilof Islands) represents the culmination of this tendency- 
in the known species of the genus. 
