268 NEW YORK STATE MUSEUM 
Nymph. Length 34mm, abdomen 24—25mm, hind femur 4.5mm; 
width of head 7.5mm, of abdomen 8mm. 
Head broad, concave between the eyes, and with a prominent 
rounded frontal shelf, whose border is fringed with stiff hairs; © 
eyes capping the anterolateral angles of the head; sides of the 
head bulging behind the eyes, and regularly rounded to the 
slightly concave middle hind margin, scurfy hairy; thorax and 
bases of the legs very hairy; disk of the prothoracic dorsum pro- | 
duced laterally at its ends into thin, shelflike, bristle-fringed 
lobes. : 
Face blackish; sides of the mesothorax and metathorax brown, 
divided by a broad, vertical paler stripe (an indication of the 
Fig. 15 Labium of the nymph of Cordulegaster sayi (supposition) 
adult color pattern, that is apt to be absent in younger nymphs); | 
wing cases with darker pigmentation on the nodus and at the | 
stigma; abdomen with a pale, middorsal line, bordered at either | 
side with a row of large, brown spots, a pair on each segment, | 
best defined om segments 7 and 8 and largest on segment 8. 
Between these rows and the lateral margins on each side are 
two additional equidistant rows of ill defined spots, and the 
apical angles of each segment are washed with brown. Abdo- 
men little hairy beyond the middle, much less so than in dias- 
tatops; stout, straight, conspicuous lateral Spines. on seg- | 
ments 8 and 9; appendages yellow, black tipped and with a 
copious fringe of black hairs on their internal margins. | 
Labium [fig.15] of the usual large size and spoon-shaped form, 
with five lateral setae and 11 mentals each side, the six outer- 
