1916.] NATURAL SCIENCES OF PHILADELPHIA. 519 



Georgia, Rabun County, Clayton, altitude 2,000 feet, May 18, 1911 

 (Bradley i. 



Michigan, Walnut Lake, June 26 to 28, 1907 (Needham). 



Colorado, Clear Creek County, June 27, 1915 (Oslar). 



The wing is shown on Plate XXVI, fig. 24. 



The malt' hypopygium (Plate XXIX, figs. 68, 69) with the pleurites 

 stout, the outer angle produced caudad into a long, fleshy, finger-like 

 lobe, blunt at the apex, provided with numerous tubercles; ventral 

 pleural appendage (v) large, prominent, being chitinized and bifid 

 the caudal or outer arm longer, slender, the diameter uniform, the 

 apex subacute; cephalic or inner arm shorter, expanded distally into 

 a broad, truncated apex; dorsal pleural appendage (d) a subtriangular 

 fleshy lobe whose inner angle is produced into a prominent chitinized 

 curved horn; the cephalic inner margin with about six hair-bearing 

 tubercles. Ninth tergite with the caudal margin transversely 

 concave, not notched medially. Penis-guard very slender. 



Gonomyia (Gonomyia) californica Alexander. 



Gonomyia californica Alexander; Canadian Entomologist, vol. 48, pp. 324. 

 325 (1916). 



This is the western representative of the blanda group: 



British Columbia, Peachland, May 19, 1912. 



California, Humboldt County, Blue Lake, June 20 to 27, 1907 

 (Bradley); the type-locality. 



The wing is shown on Plate XXVI, fig. 25. 



The male hypopygium (Plate XXIX, figs. 66, 67) with the pleurites 

 stout, outer angle produced caudad into a slender, fleshy lobe, 

 pointed at the apex and sparsely provided with setigerous tubercles; 

 ventral pleural appendage (v) a two-armed chitinized rod whose 

 outer ventral arm is stout basally, narrowed toward the apex which is 

 again expanded into a blunt tip; the inner arm bends dorsad, slender, 

 tapering into an acute blackened apex; dorsal pleural appendage 

 (d) a triangular fleshy lobe provided with long, coarse hairs. Ninth 

 tergite with a deep, narrow, median notch the lateral angles rounded. 

 Penis-guard (p.gd.) prominent, the sides subparallel, the apical half 

 on the dorsal surface with numerous hairs, the apex produced ventro- 

 caudad into a prominent median lobule. 



The Sulphurella Group. 

 Gonomyia I Gonomyia I sulphurella Osten Sacken. 



Gonomyia sulphurella Osten Sacken; Proceedings of The Academy of Natural 

 Sciences of Philadelphia, p. 230 (1859). 



A wide-ranging species throughout eastern North America: 



