May, 1953 
3. Cloeon mendax (Walsh) 
Cloe mendax Walsh (1862:381). 
The lectotype of this species, now in the 
Museum of Comparative Zoology, is a fe- 
male and, as it is a true Cloeon, it must be 
a different specimen from the one McDun- 
nough found labeled as mendax in the 
M.C.Z. about 1928 (McDunnough 1929: 
173). The specimen he saw was a Centrop- 
tilum, with two pairs of wings, while the 
specimen I saw there in 1942 clearly had 
only one pair of wings. Walsh’s male type, 
unfortunately, is lost, and additional male 
specimens from Illinois are yet to be taken. 
I have seen males of this species from New 
York. 
Mare.—Length of body 4+ mm., of fore 
wing 6 mm. Thoracic notum and pleura 
stained with red; thoracic venter white, 
with a gray-green cast; legs white, often 
with a green cast; wings hyaline. Abdom- 
inal tergites stained with red; _ sternites 
greenish white; apical segments opaque, 
basal ones translucent; genital forceps, fig. 
300, and the three well-developed caudal 
filaments white. 
FEMALE.—Length of body 5 mm., of fore 
wing 7 mm. General color very light yel- 
lowish, lacking red staining of male. Thorax, 
wings, and legs in fresh specimens variably 
stained with bright green. 
This species is known from Illinois, Mas- 
sachusetts, Michigan, New York, and On- 
tario. 
Illinois Records.—Barry: sweeping wil- 
lows near pond, Aug. 12, 1948, Sanderson 
& Stannard, 22. Rock IsLanp: 26, 49 
(Walsh 1862:381). 
4. Cloeon minor McDunnough 
Cloeon minor McDunnough (1926:190). 
Mate.—Length of body and of fore wing 
3mm. Thoracic notum black; each pleuron 
very dark brown, with pink staining near 
wing base; sternum dark brown; legs white, 
with a faint, red spot near middle of each 
femur; wings hyaline. Abdominal tergites 
2-6 hyaline, with a pair of large, brown, 
sublateral blotches on each segment, these 
blotches coalescing on meson of tergites 3 
and 6; sternites 2-6 hyaline, each with a 
pair of lateral, brown triangles and a pair 
of submedian, black dashes at posterior mar- 
gin; apical tergites dark brown and sternites 
Burxks: THE MaAyrties oF ILLINOIS 143 
light brown; genital forceps and caudal 
filaments white. 
Known from Ontario. 
5. Cloeon insignificans McDunnough 
Cloeon insignificans McDunnough 
(1925b:186). 
Mate.—Length of body 3 mm., of fore 
wing 4 mm. Thoracic notum and pleura 
dark brown, sternum lighter brown, legs 
white, and wings hyaline, with longitudinal 
veins faintly yellowish. Basal abdominal ter- 
gites white, with a faint red, median streak 
on tergites 2 and 3, sternites 2 and 3 white; 
apical tergites light brown, sternites tan; 
genital forceps and caudal filaments white. 
Known from Ontario. 
6. Cloeon rubropictum McDunnough 
Cloeon dubium Clemens (1913: 341) 
not Walsh. Misidentification. 
Cloeon rubropicta McDunnough (1923:43). 
, 
Mate.—Length of body 3-4 mm., of fore 
wing 4-5 mm. Head dark brown, shading 
to yellow below ocelli, antennae yellow, 
flagella slightly dusky. Thorax dark brown 
on dorsum and pleura, venter yellow; legs 
light yellow; wings hyaline. Abdominal seg- 
ments 2-6 white, translucent, each tergite 
with a pair of submedian, red, transverse 
marks at posterior margin and a pair of 
sublateral, red dots; tergites 2, 3, and 6 with 
vague, median, longitudinal, red marks; a 
longitudinal, black spiracular hairline pres- 
ent at lateral margins of these segments; 
sternites 2—6 unmarked, apical tergites red- 
brown, apical sternites vaguely shaded with 
brown; genital forceps and caudal filaments 
white. 
FEMALE.—Length of body 4-5 mm., of 
fore wing 5-6 mm. Head and thorax yellow 
to dull tan, thoracic venter dirty white to 
yellow. Abdominal tergites translucent tan, 
faint, submedian, red marks often present 
on posterior margins of all tergites, ex- 
tensive, black tracheal and spiracular marks 
present; venter pale yellow to white; legs 
and caudal filaments white or faint yellow. 
Known from Illinois, New York, On- 
tario, Ohio, and Quebec. 
Illinois Records. — Eppyvitite: Lusk 
Creek, June 19, 1940, Mohr & Riegel, 14. 
Oakwoop: June 6, 1925, T. H. Frison, 1 2, 
12; June 9, 1926, Frison & Auden, 1¢,39. 
