Key to Cerodontha , 1. Notopleuron yellow 2 
Subgenus Poemyza — Notopleuron black 3 
Species 2 (1). Orbit black; outer crossvein lacking 
£. (_P. ) chillcottiella Spencer, n. sp. 
Synopsis. 3d antennal segment conspicuously angu- 
late (fig. 555); frons ochreous above, darkened be- 
low; lunule dark, slightly higher than a semicircle; 
mesonotum grayish black, acr in 2-3 rows; legs 
black, with all knees yellow; wing length in female 
1.9 mm (fig. 556); male genitalia unknown. 
Host /Early Stages. Unknown. 
Distribution. Colorado. 
Reference. Part 2, p. 277. 
— Orbit yellow; outer crossvein present 
C. ( P. ) superciliosa (Zetterstedt) 
Synopsis. 3d antennal segment weakly angulate; 
frons blackish below, yellow above adjoining ocellar 
triangle, orbit yellow; 2 reclinate ors, 2 or 3 ori, 
at least lower slightly proclinate; lunule bright 
yellow, face and 3d antennal segment black; meso- 
notum matt black; notopleuron and upper margin of 
mesopleuron bright yellow; legs black, with all fe- 
mora dis tally yellow; squama, fringe, and wing base 
rectangular plate (fig. 557); male genitalia with 
aedeagus (fig. 558) having paired distal tubules 
long, S-shap^d. 
Host/Early Stages. Poaceae, including Avena 
sativa , Elymus canadensis , Hordeum jubatum , 
Triticum aestivum , and Zea mays ; in Europe many 
other species recorded by Nowakowski (1973: 113). 
Larval leaf mine frequently in upper half of leaf, 
pupation internally; puparium metallic black, pos- 
terior spiracles each with 3 bulbs, 2 lower ones 
curving round base of hooklike upper one. 
Distribution. Widespread in northern half of United 
States (Frick, 1959: 381, as P. lateralis ) ; Cali- 
fornia; new records: Colorado, incl. Mt. Evans, 
Timberline, 11,700 ft, 2 m. , 2 f., 22. VII. 61 (C. H. 
Mann, CNC); northern Europe. 
Reference. Spencer, 1981: 183. 
Note. This species was referred to in the litera- 
ture as lateralis Macquart until its correct 
identity was established in Europe by Nowakowski 
(1973). 
3 (1). Femora yellow on distal half or 3d 4 
— Femora at most yellow at knees for approx, femoral 
width, or largely black with only foreknee yellowish 
5 
4 (3). Orbit yellow on upper half C. (P. ) muscina (Meigen) 
Synopsis. Orbit conspicuously differentiated, yel- 
low above, more blackish below; lunule high, narrow, 
brown; mesonotum and side of thorax black; legs with 
femora black on lower half, bright yellow for distal 
half or 3d; squama yellow, margin and fringe dark; 
wing length 1.9-2. 3 mm; male genitalia with aedeagus 
(fig. 559) having distal tubules short and conspic- 
uously rotated to right. 
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