CORDULEGASTER 159 
a narrow line of black on the lateral margins next the eye, and a black hair 
fringe. Pale stripes of the front of the thorax rather broad, strongly divergent 
forward and pointed downward. The broad black shoulder stripe is divided above 
by a little greenish triangle (due to incomplete fusion of black stripes 2 and 3). 
Likewise, the two oblique pale stripes of the sides are broad and parallel, with 
the intervening black, paler in the middle (due to the incomplete fusion of black 
stripes 4 and 5). Legs black. Wings hyaline with a tawny stigma. The pale 
markings of the abdomen consist of a line of lateral triangles each side, con- 
tinuous on segments 2 and 3, abbreviated progressively on 4 to 8, reduced to a 
squarish spot on 9; i0 and appendages black. 
This is the common species in the northeastern states. In the glades 
of the woods the adult males course the streams in persistent flight 
during hours of sunshine in hot weather. Females are less in evidence, 
but are seen sometimes ovipositing by vertical thrusts in the sand in 
shoal riffles up-stream from the settling basinsin the brooks. The cast 
skins left behind by the nymphs at transformation are found com- 
monly sticking to roots and logs at the edges of these basins. 
120. Cordulegaster maculatus Selys 
Selys 54, p. 105: Mtk. Cat. p. 77: Garm. ’27, p. 122. 
Length 68 mm. Expanse 84 mm. Atlantic Coast, N. S. to N. C. 
A stout hairy species with attingent eyes, and a small brownish occiput that 
is clothed all over its upper and front surface with brown hairs. Face pale, with 
obscure brownish clypeus and labral border. Pale stripes of the front of the 
thorax abbreviated and pointed below and strongly divergent downward; those 
of the sides broad and regular. Legs blackish, brown at base. Wings hyaline 
with tawny stigma. Abdomen with pale spots in two rows on the abdomen well 
up toward the middorsal line, double on segment 2, single and diminishing in 
size to rearward on segments 3 to 8; 9, 10 and appendages black. 
Davis (13, p. 18) reports this species as often found flying up and 
down brooks. Williamson (’07, p. 144) thus writes of its egg-laying 
habits: 
Two females were observed to fly down from trees alighting on algae 
covered rocks in the stream bed. On the portions of these rocks not covered 
by water they crawled about in an awkward manner thrusting the abdomen with 
much commotion into the algae beneath the water. Males alternated between 
the trees and short flights over the water. 
