514 PROCEEDINGS OF THE ACADEMY OF [Oct., 
The male hypopygium is described below, the characters being 
largely taken from paratypic material in my collection. Hypopygium 
(Plate XXIX, figs. 59, 61) with the pleurites rather prominent, 
cylindrical; ventral pleural appendage (v) elongate, the outer angle 
produced caudad as a rather broad flattened blade that is slightly 
chitinized at the tip; inner caudal margin of the appendage with 
about five or six acute chitinized appressed teeth, of which the inner- 
most is the largest; a fleshy lobe on the ventral side of the outer 
blade; middle pleural appendage lacking (possibly of a caducous 
nature) ; dorsal pleural appendage (d) Ijing on the inner caudal angle 
of the pleurite, triangular in outline, the caudal angle produced 
caudad as an elongate spine that is heavily chitinized apically, the 
inner angle a rounded lobe with numerous setigerous tubercles. 
The two Nearctic species, alexanderi and cinerea, have been dis- 
tinguished by the key given before. There is a third species, G. 
helopJnla Alexander,*^ that is even closer to alexanderi. Its known 
range is extra-limital (Lesser Antilles and British Guiana to Peru), 
but it may range into our southern limits. The two species may be 
separated as follows: 
1. Dorsal pleural appendage triangular, the caudal angle a prominent 
spine that is heavily chitinized apically; middle pleural 
appendage apparently lacking; ventral pleural appendage 
with a broad flattened blade, the inner caudal margin with 
about five or six acute chitinized appressed teeth, of which the 
innermost is the largest (Plate XXIX, fig. 59). (Nearctic.) 
alexanderi Johnson. 
Dorsal pleural appendage a fleshy lobe bearing many hairs ; middle 
pleural appendage a slender subsinuous spine; ventral pleural 
appendage with the apex flattened, smooth, chitinized, 
bilobed ; ventral margin of the appendage vnth two prominent 
teeth whose margins are minutely denticulate. (Plate XXIX, 
fig. 60). (Neotropical.) helophila Alexander. 
Gonomyia (Leiponeura) cinerea Doaue 
Dicranomyia cinerea Doane; Journal of the New York Entomological Society, 
vol. 8, pp. 182, 183, PL 7, fig. 2 (1910). 
The known range of this species is as follows : 
Washington, Whitman County, Pullman, August 10, 1898 (Piper); 
the type-locality. 
California, Humboldt County, Blue Lake, June 20-27, 1907 
(Bradley). 
The wing is shown on Plate XXVI, fig. 18. 
^Entomological News, vol. 27, pp. 343-346, figs. 1, 3 (1916). 
