260 DRAGONFLIES OF NORTH AMERICA 
angustipenne supposition, differs strikingly in having the middle gill 
but three fourths as long as the lateral gills, and broadly dilated toward 
the tip. 
KEY TO THE SPECIES 
Adults 
1 Wings hyaline, not banded with brown..... angustipenne, p. 260 
Wings with apices only, banded with brown................ a 
Wings all ‘brown... 300 uig erty er ee epae oe maculatum, p. 261 
2 Apical brown bands on hind wing only..........amatum, p. 260 
Apical brown bands on both wings... .//).)..2:6....2%- 2.2 Seepieee 3. 
3 Apical brown bands of two wings of equal width............. 4. 
Apical brown bands wider on hind than on fore wing.......... 
att ie ey ieCc Ril sete ae OR cs Ss oes AMeatee axes aa aequabile, p. 260 
4 Apical bands covering one fourth of wing... ..dimidiatum, p. 261 
Apical bands covering one sixth of wing.......... apicale, p. 261 
246. Agrion angustipenne Selys 
Selys ’53, p. 9: Mtk. Cat. p. 28. 
Syn: elegans Hag. 
Length 56 mm. Expanse 80 mm. Pa. to Ga. 
An elegant bronzy green species with shining wings faintly tinted with 
yellowish. Face green except for a yellow labrum with black front border. There 
is an oblique yellow streak below each antenna. Thorax shining metallic green 
in front, yellowish beneath, the yellow extending up the third lateral suture and 
covering the junction with the abdomen. Legs black. Costa green, stigma of 
female yellow. Abdomen all bronzy green. 
247. Agrion amatum Hagen 
Hag. ’90, p. 244: Mtk. Cat. p. 28: Garm. ’27, p. 111. 
Length 56 mm. Expanse 80 mm. N. H. to N. C. 
Similar to the preceding; doubtfully distinct. Differs by having a pale brown 
patch covering the apical fourth of the hind wing. The green of the dorsum 
changing to brilliant irridescent blue in certain lights. 
248. Agrion aequabile Say 
Say ’39, p. 33: Mtk. Cat. p. 27: Ckll.’13, p. 173: Kndy. ’15, p. 338: 717, p. 484: 
Garm. ’17, p. 467: Kndy. 718, p. 406: Garm. ’27, p. 109: Walk. ’18, p. 410. 
Syn: virginiana Selys, Var: hudsonicum Hag., yakima Hag., coloradicum 
Ckll., californicum Kndy. 
Length 50 mm. Expanse 66 mm. Ont. and Iowa to Me. and N. Y. 
This is a broad winged species of metallic green hue with wing tips unequally 
covered with brown. Face greenish with black labrum. Antennae black. Thorax 
