dorsal projection, each with 8 bulbs in 2 groups, 
upper ones more elongate (see Frick, 1956: fig. 
4, B). 
Distribution. Widely distributed through most of 
United States; Argentina, Canada, Chile, Europe. 
References. Frick, 1956: 290; Spencer, 1969a: 149, 
302. 
Face largely yellow C. solidaginis (Kaltenbach) 
Synopsis. As in C . humeral is apart from largely 
yellow face; male genitalia with aedeagus as in 
figures 894, 895. 
Host/Early Stages. Solidago spp. Leaf mine and 
larval characters essentially as in C . humeral is . 
Distribution. According to Frick (1959), "found 
throughout United States"; Canada, Europe. 
References. Frick, 1956: 292; 1959: 392; Spencer, 
1969a: 155; 1981: 312; Spencer and Stegmaier, 
1973: 89. 
10 (1). Frons and notopleuron largely dark CJ. obscura Spencer 
Synopsis. Frons brownish black or in palest speci- 
mens brownish yellow, orbit more shining black; 
gena narrow, 0.125 height of eye; all antennal 
segments black; mesonotum shining black; pleura 
normally entirely black but in paler specimens, 
particularly females, humerus and notopleuron dull 
yellowish; legs black; squama gray, fringe jet 
black; halter yellow; wing length from 1.6 mm in 
male to 2 mm in female, last section of vein M 3+4 
twice length of penultimate; male genitalia with 
aedeagus as in figures 896, 897; surstylus and 
epandrium with conspicuous bristles (fig. 898). 
Host/Early Stages. Unknown. 
Distribution. Florida; Costa Rica, Jamaica. 
Reference. Spencer and Stegmaier, 1973: 86. 
Frons and notopleuron bright yellow 11 
11 (10). Mesonotum distinctly matt grayish 12 
Mesonotum black, at least moderately shining 13 
12 (11). Large species, wing length 2.5-3.25 mm 
C. gigantea (Frick) 
Synopsis. Upper orbit darkened; mesonotum matt 
grayish black; legs either entirely black or fore- 
knee slightly paler, yellowish; squama gray, mar- 
gin and fringe black; male genitalia with aedeagus 
(figs. 899, 900) having distiphallus conspicuously 
divided. 
Host/Early Stages. Unknown. 
Distribution. California, Illinois, Maryland, 
Virginia; new records: New York, Tompkins Co., 
Danby, 1 m. , 3. VI. 64 (L. L. Pechuman, CUI) ; 
Virginia, Montgomery Co., Blacksburg, 1 f . , 
28.V.62 (J. G. Chillcott); Canada. 
References. Frick, 1956: 296; Spencer, 1969a: 149; 
1981: 301. 
Smaller species, wing length 1.6 mm 
C. stegmaieri Spencer 
Synopsis. Orbit darkened at least to upper, nor- 
145 
