EPICORDULIA 175 
134. Neurocordulia yamaskanensis Provancher 
Prov. ’75, p. 248: Mtk. Cat. p. 123: Walk. ’13, p. 161: Howe 719, p. 53: Garm. 
127, p. 236. 
Length 45 mm. Expanse 65 mm. Que. and Me. 
This northern species is similar to the preceding, a little larger in stature and 
differs in coloration of the wings by lacking the brown spots on the antenodals 
and nodus, and having less depth and extent of coloration at the wing bases. 
There are diffuse spots on several cross veins before the level of the triangle. The 
stigma is a little shorter than in obsoleta. 
Walker (’08) says that it frequents large lakes or rivers and is unique 
among our dragonflies in its habit of flying only after sunset, when the 
mayflies, on which it feeds, are abroad. 
135. Neurocordulia virginiensis Davis 
Davis ’27, p. 155. 
Length 49 mm. Expanse 70 mm. Va. 
A yellowish brown species, similar to the preceding. Face pale greenish 
yellow. Thorax rather uniform yellowish brown. Legs pale, with black spines. 
Wings hyaline with faint isolated yellow clouds surrounding the basal cross 
veins as far out as the triangles. Cross veins fewer thanin JN. obsoleta, and with 
none in the (first median) space before the arculus, and with but two cell rows 
behind Cue in the fore wing. Abdomen, as in WN. obsoleta. Appendage pale 
brown. 
Male imago and nymph unknown. 
29. EpicorDuLia Selys 
These are fine large free-ranging Cordulines with beautifully spotted 
wings. The head is wide, the thorax is hairy. The abdomen is long and 
slender. The triangles of both wings are divided by a single cross vein. 
The fore wing subtriangle is divided into 3 cells. The broad brown wing 
spots occur at base, middle and tip of both wings, and these are so 
conspicuous that members of this genus are readily distinguished even 
in flight. 
The nymphs are broad, flat, spiny, stiff-legged creatures that inhabit 
the beds of ponds and slow streams. They sprawl over loose trash or 
clamber on submerged logs. The head has a low frontal shelf projecting 
between the antennae, and a pair of obsolete tubercles on top. The 
hind angles are rounded. The legs are long and widely separated below. 
There are large, cultriform dorsal hooks on abdominal segments 3 to 9, 
and lateral spines on 8 and 9, on 8 short, incurved, and on 9 long and 
slightly outcurved. The female oviposits while flying alone. She de- 
