522 PROCEEDINGS OF THE ACADEMY OF [Oct., 
appendage (3) a slender, fleshy rod, beyond the sUghtly enlarged 
base bent strongly dorsad so that it lies above the second appendage, 
directed caudad at the tip which is capped by a short, blunt, chitinized 
spine. Ninth tergite short, broad, the caudal margin transverse. 
Ninth sternite with a prominent median knob on the caudal margin,^ 
provided with numerous setigerous tubercles. 
Gonomyia (Gonomyia) cognatella Osten Sacken. 
Gonomijia cognatella Osten Sacken; Proceedings of The Academy of Natural 
Sciences of Philadelphia, p. 230 (18.59). 
A more southern species than the last, their ranges overlapping 
in New York State : 
Connecticut, New Haven County, East River, July 6, 1910 (Ely). 
New York, Fulton County, Sport Island, Sacandaga River, June 
18, 1911, to August 26, 1916 (Alexander); Herkimer County, Indian 
Castle, June 10 to 13, 1915 (Alexander). 
Maryland, Montgomery County, Cabin John Bridge, May 16, 1909 
(Knab); Plummers Island, May 24, 1914 (McAtee). 
District of Columbia, Washington (Osten Sacken) ; the type-locality. 
Virginia, Fairfax County, Difficult Run, July 25, 1915 (McAtee 
and Alexander). 
North Carolina, Buncombe County, Black Mountains, July 16, 
1912 (Beutenmuller). 
The wing is shown on Plate XXVI, fig. 29. 
The male hypopygium (Plate XXIX, figs. 73-75) mth the pleurites 
very short and stout, the inner dorsal angle produced caudad as a 
slender, finger-like lobe, fimbriate with eight or nine long stout hairs 
on the dorsal inner edge; at the base of the lobe a small, slender, 
cylindrical knob (k) with three long hairs at the apex; ventrad of 
this finger-like angle of the pleurite is an elongate, very slender, pale 
appendage (2) directed caudad and slightly ventrad and proximad, 
at the apex with two long slender hairs; pleural appendage (3) directed 
ventrad on its basal portion, soon bent directly upon itself, dorsad, 
the tip caudad; the appendage is pale, chitinized, slender, bifid, the 
lateral arm with the apex somewhat twisted, the proximal arm a 
slender, pale stylet directed strongly proximad, at the apex with an 
elongate, slender, black, chitinized spine. Proximad of the base 
of the knob (fc) is a slender appendage with a prominent hair at the 
apex and two slightly smaller subterminal hairs. 
