CORDULIA 197 
A species with dull coloration and very heavy thorax. Face blackish with 
pale yellowish anteclypeus and sides of frons. Vertex black with greenish re- 
flections. Occiput dark brown. Thorax metallic green varied with reddish brown 
Side spots obsolete, brownish. Wings hyaline, costa yellow, stigma tawny. Legs 
black, paler basally. Abdominal segment 2 with large inferior yellow spots be- 
fore and behind the auricle; 3 with basal spots indistinct; 4-10 greenish black, 
unspotted; 1-2 densely hairy. 
Walker ’25 says: 
This species ....is one of the earliest to appear in the spring. ....an 
inhabitant of cool bogs or shallow bog ponds... . kept most of the time a little 
over 2 feet above the water, just above the tops of the sedges, hovering for a time 
in one spot but changing their orientation frequently and not remaining long in 
any one place. 
165. Somatochlora septentrionalis Hagen 
Hag. ’61, p. 189: Mtk. Cat. p. 182: Walk. ’25, p. 160. 
Length 45 mm. Expanse 59 mm. N. F. and Que. 
A small somewhat slender species with dark metallic face and vertex. Ante- 
clypeus and sides of frons yellowish. Occiput brown. Thorax bronzy green; 
lateral stripes obscured, reddish brown. Legs black, front femora brownish be- 
neath. Wings hyaline or slightly flavescent. Basal abdominal segments dull 
brown; hind lateral margin of 1 yellowish; 2 with a whitish apical annulus; 3 
with a pair of obscure yellowish dorsal spots; remaining segments dark metallic 
green. 
33. CorpDuLIA Leach 
These are blackish dragonflies of medium size, clear-winged and with 
touches of bronzy green color showing on the thorax through a rather 
heavy coat of gray hair. The triangle of the hind wing is not divided 
by a cross vein. The inferior appendage of the abdomen in the male is 
deeply bifurcated, and the arms of the fork are again notched at their 
tips. 
There is one northern species in our fauna, and there is another at 
similar latitudes in the old world. 
The nymphs are thick set and hairy, with no vertical tubercles on the 
head and no dorsal hooks on the abdomen. The lateral spines of seg- 
ments 8 and 9 are very short. The nymph of C. shurileffi has been 
described Ndm. (’01, p. 5038). 
166. Cordulia shurtleffi Scudder 
Scud. ’66, p. 217: Mtk. Cat. p. 128: Howe 19, p. 61: Garm. ’27, p. 214. 
Length 46 mm. Expanse 64 mm. Alaska, B. C., N. J., Pa. and N. Y. 
A fine greenish, bog-loving, northern species with thorax rather densely 
covered with whitish hairs. Face olivaceous, tending to a waxy yellowish, over- 
