1916.] NATURAL SCIENCES OF PHILADELPHIA. 515 
The male has never been described, and this specimen is made the 
allotype. 
Allotype, cf.— Rostrum and palpi dark browai. Antennse with 
the basal segments enlarged, the second segment as large as or 
larger than the first; flagellar segments small, brown. Head pale 
with a broad dark brown mark on the vertex sending a small median 
tongue backward onto the occiput. 
Pronotal scutum dark medially. Mesonotal prffiscutum light 
bvowLi with three dark brown stripes, the median one split by a 
narrow vitta of the ground-color; scutum with the lobes dark brown. 
Pleura pale yellow, striped with brown; a very short brown dorsal 
stripe extending from the pronotum back to above the fore coxae; 
second stripe beginning at the fore coxa extending caudad to the base 
of the halter; ventral stripe broadest, including the sterna and the 
bases of the middle and hind coxaj; the pale stripe enclosed broad, 
extending to the abdomen. Halteres pale. Legs with the coxse 
pale; trochanters darker; remainder of the legs broken. Wings 
hyaline or nearly so, the veins brown; basal deflection of Ri+i, r-m 
and the basal deflection of Cui dark brown; a pale brownish gray 
oval stigma. Venation (Plate XXVI, fig. 18) with Rs short, straight, 
oblique, a little longer than the r-m cross-vein; basal deflection of 
Cih at the fork of M. 
Male hypopygium (Plate XXIX, fig. 62) with the pleurites rather 
prominent, cylindrical; ventral pleural appendage (v) elongate, 
flattened, blade-like, the apex chitinized; a rounded lobe on the inner 
ventral side just before the apex; at the base on the inner dorsal 
side, a sharp, acute, chitinized point; middle appendage a slender, 
slightly curved pale hook, cUrected inward, the apex slightly 
chitinized; dorsal pleural appendage {d) a subtriangular lobe, the 
caudal angle produced caudad as a short spine, heavily chitinized 
at the apex, the inner angle prominent, produced slightly cephalad, 
with numerous setigerous punctures. 
Allotype in the collection of Cornell University. 
The type is grayish, this color being produced by a pruinosity that 
is not shown by the alcoholic allotype. 
The Pleuralis Group. 
Gonomyia (Leiponeura) sacandaga Alexander. 
Gonomyia sacandaga Alexander; Proceedings of The Academy of Natural 
Sciences of Philadelphia, pp. .587, 588, PI. 27, fig. 25 (wing) ; PI. 26, fig. 21 
(hypopygium) (1914). 
This species is still known only from the type station where it is 
common. 
