246 NEW YORK STATE MUSEUM 
In addition to the differences in coloration and appendages 
clearly stated by de Selys as distinguishing this species from 
the typical erythromma, there are differences of venation which 
may be indicated by tabular comparison: 
CHARACTER 
Anterior side of the) 
quadrangle 
Anal vein separating 
from the hind margin 
ERYTHROMMA 
shorter (f. w.) or equal 
(h. w.) to the inner 
side 
much before the verti- 
cal cubitoanal cross 
vein 
CHROMAGRION 
2(f.w.) to 244(h.w.) times 
the length of the in- 
ner (proximal) side 
just before or opposite 
the obliquely placed 
cubitoanal cross vein 
Vein M, beginning to,opposite the origin of |45 cells beyond the 
be angulate (f. wing) vein M». level of the origin of 
vein Moe, and near 
the level of the 
stigma 
Areoles behind vein| wider than long longer (in the axis of 
Cue 
the wing) than wide 
Chromagrion conditum Hagen 
Plate 18, fig. 1-3 
1876 ?7Erythromma conditum MHagen, Acad. Belg. Bul. (2) 
41:1305 
1898 7Erythromma conditum Calvert, Am. Ent. Soe. Trans. 
20 :234 
1895-97 Erythromma conditum Calvert, N. Y. Ent. Soc. Jour. 
3:43 and 5:92 (listed from Ithaca and Hamburg) 
1899 Erythromma conditum Kellicott, Qdon. Ohio, p.28 
1900 79Erythromma conditum Williamson, Dragon Flies Ind. 
p.265 
My first morning at Saranac Inn (June 14, 1900) I went out 
before breakfast along the southwest side of the outlet of Little 
Clear pond, and found in a little trashy bay near the pond 
Tetragoneuria spinigera, Ladona jae 
Leucorhinia glacialis and this species all transform- 
ing together. 
leffi Chromagrion transformed per- 
haps a little farther out from shore than any of the others, 
clambering up the projecting twigs of small trees that had 
been felled in the edge of the pond outlet, and transforming a 
few inches above the surface of the water. 
in the same shallows. 
Later, I found nymphs of Cordulia shurt- 
