246 



NEW TORK 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: 



CHAEA-CTBR 

 Anterior side of 

 quadrangle 



the 



Anal vein separating 

 from the hind margin 



Vein M4 beginning to 

 be angulate (f. wing) 



Areoles 



CU2 



EKTTHROilMA 



Shorter (f. w.) or equal 

 (h. w.) to the inner 

 side 



much before the verti- 

 cal cubitoanal cross 

 vein 



opposite the origin of 

 vein M2 



behind vein wider than long 



CHEOMAGEION 



2 (f . w.) to 21/2 (h.w.) times 

 the length of the in- 

 ner (proximal) side 



just before or opposite 

 the obliquely place(J 

 cubitoanal cross vein 



4-5 cells beyond the 

 level of the origin of 

 vein M2, and near 

 the level of the- 

 stigma 



longer (in the axis of 

 ' the wing) than wide 



Chromagrion conditum Hagen 



Plate 13, fig. 1-3 

 1876 ?Brythromma conditum Hagen, Acad. Belg. Bui. (2)- 



41:1805 

 1893 7Erythromma conditum Calvert, Am. Ent. Soc. 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, Odon. Ohio, p.28 



1900 ?Erythromma 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 julia, 

 Leueorhinia glacialis. and this species all transform- 

 ing together. Later, I found nymphs ofOordulia shurt- 

 1 e f f i in the same shallows. 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. 



