Gena little more than 0.5 height of eye; abdomen 
largely yellow _P. coquilletti Spencer, n. sp. 
Synopsis. Closely resembling P. genalis ; wing 
length from 3.2 mm in male to 3.5 mm in female, 
2 d costal section shorter, twice length of 4 th; 
abdomen paler, predominantly yellow; male geni- 
talia with aedeagus as in figures 1117, 1118; 
sperm pump minute. 
Host/Early Stages. Unknown. 
Distribution. Illinois. 
Reference. Part 2, p. 314. 
18 (14). 2 equal ors 19 
Upper ors shorter than lower or lacking 23 
19 (18). Femora predominantly black, at most foreknee 
yellowish 20 
Frons entirely yellow P. nervosa Loew 
Synopsis. Frons, face, gena, and palpus yellow; 
3d antennal segment black, 1st and 2d bright 
yellow; hindmargin of eye black but vti on yel- 
low; mesonotum and scutellum ash gray, acr 
lacking; upper half of thorax broadly yellow; 
legs with femora bright yellow, tibiae and 
tarsi brown; squama yellow, fringe ochreous; 
wing length 2.4 mm in male, 2 d costal section 
short, 1.5 times length of 4th; male genitalia 
with aedeagus as in figures 1119, 1120 ; sperm 
pump minute. 
Host/Early Stages. Unknown. 
Distribution. District of Columbia, Iowa, 
Kansas; new records: Indiana, Tippecanoe Co., 
Lafayette, 1 m. , 5.V.16 (j. M. Aldrich); Michi- 
gan, Gladwin and Jackson Cos. (C. W. Sabrosky) ; 
Pennsylvania, Lucerne Co., Hazelton, 1 m., 
10.V.10 (Dr. Dietz Coll., PSU). 
Reference. Frick, 1959: 432. 
20 (19). Femora entirely black 21 
Femora with foreknee yellowish 22 
21 (20). Frons conspicuously projecting above eye; large 
species, wing length in male 3.1 mm 
“ P. felix Spencer 
Synopsis. Frons uniformly yellow, orbit slight- 
ly darkened below, 2 ors, 3 ori; hindmargin of 
eye, antenna, palpus black; gena broad, 0.5 
height of eye; mesonotum and scutellum matt 
gray, acr in 4 rows; humerus, upper 3d of meso- 
notum, and notopleuron, at least faintly, yel- 
lowish; squama and fringe yellow; wing with 2 d 
costal section twice length of 4 th; male geni- 
talia with aedeagus as in figures 1121 , 1122 ; 
sperm pump minute. 
Host/Early Stages. Unknown. 
Distribution. Northern California. 
Reference. Spencer, 1981: 387. 
Frons not projecting above eye; smaller species, 
wing length 2 . 1 - 2.5 mm 
Chroma tomyia castillejae ssp. nordica Spencer 
181 
