270 NEW YORK STATE MUSEUM 
Genus CHIRONOMUS 
Meigen, 1803 
-~ 
The following table contains North American species which are 
not included in the key given in Bul. 86, and in addition tabulates 
the males of those species which are characterized by their dusky 
thorax and abdomen (the thorax sometimes having yellow humeri 
and faint indications of paler division lines upon the dorsum, the 
segments of the abdomen sometimes with gray or yellowish posterior 
margins; legs nearly unicolored, yellowish to blackish). 
a Wings with several spots or bars 
b Wings with several spots 
c Tibiae each with two distinct white bands..... naevus Mitchell ’08 
cc Tibiae without distinct white bands 
d Length 2 mm. or less 
Q NOS Kall SVS SHOWS, OMS Ble WHE CHOSS WON. sccoacocccaccsce 
labeculosus Mitchell ’08 
ee Spot distad of cross vein, halteres pale, foremetatarsus 134 times 
aS llomer AS WAS IA ooocooccnndoocccccc00e MOESC MATA mM Sr 
dd Length over 2.5 mm., halteres with dusky tip, foremetatarsus nearly 
WA tabhineS AG lloimer BAS WAS WII. coco ccocoooacccc0c nubeculosus 
bb Wings with fasciae or bars 
c Wing with two complete brown bars, the distal one mottled with clear 
SPOUS mse ee awe ES ead Rie a ean eee perpulcher Mitchell ’o8 
cc No clear spots on bars 
d Legs nearly wholly whitish, knees slightly brownish, less than one 
fourth of tibia brownish 
e Wing without black apical band..... calopterus Mitchell ’08 
ee Wing with wide apical band......... zonopterus Mitchell ’c8 
dd Apex of each femur and basal fourth (or more) of each tibia, 
blackish 
e The dark band at apex of wing measured along 245 less than 
half as wide as the white band which precedes it.............- 
poecilopterus Mitchell, ‘08 
ce The width of the apical band nearly equal or greater than the 
white band which precedes it 
f Entire fore and hind tibiae dark..nephopterus Mitchell, ’c8 
ff Fore tibiae not wholly dark 
GF AXoical Inaihe Ose lorial THANG WMH, oo c000 000000006 pulchripennis 
gg Apex of hind tibiae dusky 
i, Middle sacuoimn Or Ioving! tlre WHTTMEES Jooco0co0cdo0K000c00s 
exquisitus Mitchell, ’08 
hh Middle section of hind tibiae not pure white ............ 
taeniapennis 
aa Wings unspotted, sometimes with darkened cross vein 
b Thoracie stripes gray or blackish, or thorax wholly dull black; abdomen 
mainly black 
