268 



NEW YORK STATE MUSEUM 



Nymph. Leng-th 34mni, abdomen 24-25mni, hiad 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. 16 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 on 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 d i a s- 

 t a t o p s ; 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.l5] of the usual large size and spoon-shaped form, 

 with five lateral setae and 11 mentals each side, the six outer- 



