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) lying 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. 

 helophila Alexander, 6 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 with two prominent 

 teeth whose margins are minutely denticulate. (Plate XXIX, 

 fig. 60). (Neotropical.) helophila Alexander. 



Gonomyia (Leiponeura) cinerea Doane 



Dicranomyia cinerea Doane; Journal of the New York Entomological Society, 

 vol. 8, pp. 182, 183, PI. 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. 



6 Entomological News, vol. 27, pp. 343-346, figs. 1, 3 (1916). 



