THE CANADIAN ENTOMOLOGIST 317 



curved; R2 a little shorter than i^2+3; Ri half again as long as 

 the cross-vein r-m; outer deflection of Ms obliterated so that cell 

 1st M2 is confluent with cell ifs; basal deflection of Cm at the 

 fork of M. 



Abdominal tergites brown, broadly margined with yellow; 

 sternites yellow, the hypopygium concolorous. Hypopygium with 

 the ninth tergite short, broad, the caudal margin transverse. 

 Ninth pleurite very short and stout, the inner dorsal angle pro- 

 duced caudadinto a blunt, fleshy lobe, whose inner margin is fringed 

 with numerous long hairs; a short, blunt, fleshy knob at the base of 

 this lobe, this knob provided with five long hairs on the margin; 

 dorsal pleural appendage slender, originating just below the knob 

 described above, directed proximad, the base enlarged with two 

 or three stout hairs, the tip slightly bifid, the caudal arm with two 

 bristles, the cephalic arm with one bristle; a stout bristle just 

 before the tip on the inner or cephalic side; second pleural append- 

 age a powerful chitinized hook, slightly curved, directed proximad, 

 toward the apex bent strongly cephalad; ventral pleural appendage 

 a slender fleshy rod, beyond the slightly enlarged base bent strongly 

 dorsad so that it lies above the second appendage, at the tip directed 

 caudad and here capped with a short, blunt, chitinized spine. 

 Ninth sternite with a prominent median knob on the caudal margin, 

 this knob with numerous setigerous tubercles. 



Habitat — Eastern United States. 



Holotype — cf, Indian Castle, Herkimer Co., N.Y., June 9, 

 1915, (Alexander). 



Allotype — 9 , topotypic. 



Paratypes—ScP 9 , topotypic. 



The types are in the collection of the author. 



G. florens may be distinguished from the closely related G. 

 cognatella O. S. by its slightly larger size, brighter colouration, 

 and the male genitalia (the powerful curved second appendage, 

 the short, black apex to the ventral appendage, etc.). 



Gonomyia (Gonomyia) flavibasis, sp. n. 



Male — Length 5.2 mm.; wing 5.3 mm. 



Rostrum and palpi dark brown. Antennae with the two basal 

 segments bright pale yellow; flagellar segments brown with a dense 



