170 DRAGONFLIES OF NORTH AMERICA 
of their eyes and the curious un-lifelike hooks and spines exposed. 
Thus situated, their concealment is perfect. They crawl a considerable 
distance from the water to transform, and leave their skins sticking to 
trees and posts often a good many meters distant from the margin of 
the water, and often as many meters above the ground. 
The adults are strong flying and rather widely ranging. They are 
fairly common in wooded districts flying along the margins of lakes and 
slow streams in the Eastern United States. 
This indigenous eastern genus includes but 2 species that may be 
separated as follows: 
KEY TO THE SPECIES 
Adults 
1 Wing expanse 77 mm. Basal antenodal cells of both wings tinged 
Sith browns ot Melts Bal). ALA BOE OC, Ane Pe transversa, p. 170 
Wing expanse 82 mm. Basal antenodal cells of both wings hyaline 
leo pacar al Fag AAV ea BMGT lio Ni eh Pin TA Ja floridensis, p. 170 
130. Didymops transversa Say 
Say 1839, p. 19: Mtk. Cat. p. 118: Howe 719, p. 51: Garm. ’27, p. 202. 
Syn: cinnamonea Burm., servillet Ramb. 
Length 58 mm. Expanse 77 mm. Alta, Me., Mich., to S. C. and Ga. 
A large, hoary, brown species with rusty red tail. Face pale with the front 
edge of the labrum darker. On the top of the frons there is an 8-spot, dilated 
at the ends longitudinally. The conical vertex and the low occiput are pale 
olivaceous. The thorax is brown with a broad, oblique pale stripe on the middle 
of the sides. Legs brown, tarsi black, tibiae yellow externally. Wings hyaline, 
except for a short basal brown streak in front of the basal space and covering 
hardly more than the first antenodal cross vein. Stigma brown and costa tawny. 
Abdomen very obscurely half ringed with black above on the middle segments; 
the paler apical half of each segment being palest on segment 7, becoming more 
or less rusty red on the apical segments, whose extreme apical margins are en- 
circled with black. Appendages tawny. 
131. Didymops floridensis Davis 
Davis ’22, p. 110. 
Length 65 mm. Expanse 82 mm. Fla. 
This is similar to the preceding species but larger and it has the base of the 
wings less extensively tinged with brown. The venation is black except for a 
somewhat paler costa. The frons above is shining black, the occiput is lemon 
yellow and narrower than in D. transversa. Behind the eye there is a long, 
narrow, black, shining area, chiefly above the eye tubercle, extending to the occi- 
put, where transversa is dull yellow. Otherwise the two are quite similar. The 
nymph is unknown. 
