90 DRAGONFLIES OF NORTH AMERICA 
convex border; in the female, all yellow, and narrowed to the median line. The 
thoracic stripes of the first pair parallel-sided and narrower than the inverted 
and opposed bordering pale 7-marks. Wings very faintly tinged with yellow at 
the base. Legs black, somewhat paler on side of femur and at base. The mid- 
dorsal line of diminishing yellowish triangles on the abdomen disappears in a dot 
on the base of 7, 8 to 10 being wholly black above in the male, 9 only so in the 
female. 
32. Gomphus hybridus Williamson 
Wmen. ’02, p. 47: Mtk. Cat. p. 93. 
Length 49 mm. Expanse 60 mm. Ind., Tenn. 
A rather smal], stocky species, having much the aspect of the preceding species 
having the thorax green striped with brown and the abdomen black marked with 
yellow. Face and occiput green. The thoracic stripes of the first pair fused above 
and below across the carina. Stripe 2 free above, then shortly fused with stripe 3, 
and then separated by a pale line below: 2 and 8 of equal width; stripe 4 inter- 
rupted above the spiracle; stripe 5 complete, narrow. Legs black, wings hyaline, 
veins black. Middorsal line of spots on middle abdominal segments long, 
lanceolate, narrow on 4; 5 and 6, shorter and wider on 7 and 8; 9 and 10 all black 
above. Segments 8 and 9 are yellow at the sides, including the lateral margins. 
33. Gomphus fraternus Say 
Say ’39, p. 16: Mtk. Cat. p. 93: Whed. 714, p. 94: Garm. ’27, p. 163. 
Length 54 mm. Expanse 68 mm. N. H. to Va. to Wis. to Ark. 
A large, strong-flying, hairy species. The thorax and the swollen basal seg- 
ments of the abdomen are densely clothed with fine soft short black hair. Face 
and occiput yellow. Thoracic stripes of the first pair, narrow with parallel sides, 
narrower than the bordering yellow. Stripe 2 free above, then narrowly fused 
with 3, then separated by a narrow green line down to the level of the collar. 
Stripe 4 is interrupted in its upper third and not at all confluent with stripe 5 
except at its ends; 5 is narrow and complete. Wings hyaline with black veinss 
Legs black. Abdominal segments 9 and 10 black above; the preceding segment, 
marked as usual in related species. 
Whedon’s (’14, p. 94) notes on the habits of this species are as fol- 
lows: 
Very often taken in pastures and open woodlands back from the rivers. 
About rapids they dart swiftly here and there above the turbulent waters, dash 
in and out of the leafy arches along the banks, or rest tightly flattened against 
the boulders in mid-stream. 
34. Gomphus externus Hagen 
Hag. 58, p. 411 (figs.): Mtk. Cat. p. 92. 
Syn: consobrinus Walsh 
Length 54mm. Expanse 68 mm. Me., Wis., Ill., Neb., Tex. and N. Mex. 
A stout fine big species of yellowish or greenish color, striped with brown. 
Face and occiput yellow. Thoracic stripes of the first pair narrow, parallel-sided. 
