AQUATIC INSECTS IN NEW YORK STATE 245 
Argia translata Hagen 
1865 Argia translate Hagen, Acad. Belg. Bul. (2) 20:410 
1901 Argia translata Calvert, Ent. News. 12:326 (recorded from 
New York State) | 
This species, discovered in our State by Dr Calvert at White 
Lake, Sullivan co., Aug. 2, 1898, was previously recorded only 
from Venezuela. Its nymph is unknown. 
CHROMAGRION gen noy. 
Since the repartition of the old genus Agrion in 1876, the 
North American Agrion conditum of Hagen has gener- 
ally been written ?7Erythromma conditun,, its affinity 
with Erythromma being doubtful on account of notable differ- 
ences in venation, in form of abdominal appendages and in type 
of coloration between this species and the typical species of the 
genus. The discovery of the nymph now gives opportunity for 
comparison of nymphal characters; the differences here are 
equally noteworthy. A tabular comparison of the principal 
characters of the nymph of our species with the nymphs of 
typical species of Erythromma and Pyrrhosoma (the only genera 
with affinities close enough to make such comparison necessary) 
will make clear the reasons (added to the well known differences 
of imagos) for proposing the establishment of a new genus. 
CHARACTER OF CHROMAGRION 
NYMPH (A.conditum type)| ERYTHROMMA PYRRHOSOMA 
Hind angles of/strongly angulate|strongly angulate|/rounded 
head i 
‘Gills long and narrow, |broad, oblong |oblanceolate, con- 
widening al-| with parallel} tracted near tip 
most to the tip,| sides, obtusely| and then point- 
then suddenly| rounded on tip| ed 
contracted, then 
pointed 
Mental setae of/|3 and a rudimen-|3-4, usually 4 1, and a rudimen- 
labium tary 4th tary 2d 
Lateral setae 5 6-7 7-8 
Hnd of lateral squarely truncate, |less square, withjobliquely trun- 
lobe of labium,} angled supe- 3 strong teeth cate, rounded 
above end hook; riorly scarcely superiorly and 
| denticulate not denticulate 
