May, 1953 
NympuH.—Length of body 11-13 mm., of 
caudal filaments 5-6 mm. Head and body 
cream colored, with vague, light brown 
markings. Tarsi ordinarily with a light 
brown band at base and a dark brown band 
at apex of each. Abdominal venter with three 
longitudinal, brown stripes, one median, 
another near each lateral margin; a brown 
crossband at posterior margin of sternite 9 
joining the three longitudinal stripes; caudal 
filaments with an extremely broad, brown 
crossband in middle and a narrow, brown 
crossband at apex of each filament. 
This species, reported from North Caro- 
lina and Illinois, is known only from female 
adults and female nymphs. The nymphs are 
found among debris and emergent vegeta- 
tion along the banks of swift, cool streams. 
Illinois Records.—Cora: April 24, 1939, 
Burks & Riegel, 12 N. HeErop: Gibbons 
Creek, March 14, 1946, Ross & Burks, 1° 
N; Herod Spring, March 14, 1946, Ross & 
Burks, 12 N; April 4, 1946, Burks & 
Sanderson, 22 N; Gibbons Creek, April 
7-10, 1947, B. D. Burks, 22, numerous 9 
N; May 15, 1941, Mohr & Burks, 492 N. 
RUDEMENT, Blackman Creek: April 2, 1932, 
Frison & Ross, 42 N; April 4, 1946, Burks 
& Sanderson, 32 N; April 4-8, 1947, B. D. 
Burks, numerous 2 N. 
2. Ameletus ludens Needham 
Ameletus ludens Needham (1905:36). 
This species differs from lineatus only in 
having brown ganglionic markings on the 
abdominal sternites of the adult female and 
in having a differently shaped apical abdom- 
inal sternite, fig. 238. The nymph of ludens, 
fig. 240, differs from that of Jineatus in 
having the entire ninth abdominal sternite 
brown, and the longitudinal, brown stripes 
Burks: THe Mayr ies oF ILLINOIS 103 
on the abdominal venter relatively wider. 
The only two adult male specimens of 
ludens known to have been collected were 
described by Needham (1924:308). 
Although ludens has been taken in the 
neighboring state of Indiana as well as in 
New York and West Virginia, it has not yet 
been collected in Illinois. 
26. PARAMELETUS Bengtsson 
Parameletus Bengtsson (1908: 242). 
Potameis Bengtsson (1909: 13). 
Sparrea Petersen (1909: 554). 
Siphlonuroides McDunnough (1923:48). 
Palmenia Aro in Lestage (1924a:35). 
In Parameletus, the fore wing, fig. 218, is 
rather narrow and elongate, the stigmatic 
crossveins are anastomosed, and the outer 
wing margin has fairly numerous, short and 
irregular intercalary veins. The hind wing 
usually has a low, broadly rounded costal 
projection, and vein M is always simple 
and unbranched. In the nymphs, the labial 
palps are forceps-like, fig. 230; the abdomen 
is somewhat flattened dorsoventrally, as in 
Leptophlebia, and the gills are broad and 
single, with the tracheation dense and pin- 
nately branched. 
There are no Illinois species of Para- 
meletus; croesus (McDunnough) and midas 
(McDunnough) (1923:48-9) were de- 
scribed from Ontario; columbiae McDun- 
nough (1938:31) occurs in the western 
states and British Columbia. 
27. SIPHLONURUS Eaton 
Siphlonurus Eaton (1868:89). 
Siphlurus Eaton (1871:37, 125). 
Emendation, unnecessarily proposed. 
Siphlurella Bengtsson (1909: 11). 
The genus Siphlonurus includes a fairly 
large number of species of large, strikingly 
Fig. 240A .—A meletus ludens, head of mature nymph, anterior aspect. 
Fig. 240B.—A meletus ludens, mature nymph, lateral aspect. 
