262 NEW YORK STATE MUSEUM 
1898 Nehallennia posita Davis, N. Y. Ent. Soc. Jour. 6:196 (listed 
from Staten Island) 
1899 Nehallennia posita Kellicott, Odon. Ohio, p.30 
1900 Nehallennia posita Williamson, Dragon Flies Ind. p.266 
This species is of wide distribution, and is probably much 
more common than our present records indicate. It has hitherto 
been reported only from Staten Island. I have taken it at 
Ithaca. I bred a single specimen at Galesburg II]. in June 1896. 
The cast skin is lacking in gills, and is distinguishable from that 
of I. verticalis only by its smaller number of raptorial 
setae; five laterals and four mentals, each side; in this, approach- 
ing Enallagma, as already mentioned. Another specimen not 
bred but apparently of this species, has the gills as slender as in 
Anomalagrion [pl.15,e], an interrupted line of blackish dashes 
along the axis; a spot before the middle followed by a blackish 
crescent band. 
ANOMALAGRION 
There is a single species. 
Anomalagrion hastatum Say 
Plate 18, fig. 6, 7 
1888 Agrion hastatum Say, Acad. Nat. Sci. Phila. Jour. 8:38 
1857 Agrion hastatum Selys, Sagra’s Hist. Cuban Ins. p.469 
1876 Anomalagrion hastatum Selys, Acad. Belg. Bul. (2) 
41:255 
1898 Anomalagrion hastatum Calvert, Am. Ent. Soc. Trans. 
20 :240 
1895 Anomalagrion hastatum Calvert, N. Y. Ent. Soc. Jour. 
3:44 (listed from Keeseville and New York city) 
1898 Anomalagrion hastatum Davis, N. Y. Ent. Soc. Jour. 
6:196 (listed from Staten Island) 
1899 Anomalagrion hastatum Kellicott, Odon. Ohio, p.49 
1900 Anomalagrion hastatum Williamson, Dragon Flies Ind. 
p.279 
This exceedingly delicate species is widely distributed in North 
America, but everywhere very local. I have found it in two 
places only, in very restricted areas of a few Square meters each. 
In both there was a dense growth of small club-rushes, with 
cool spring water filtering through them. Among the club-rush 
stems the linear yellow bodies of these insects are very incon- 
spicuous. They do not appear to fly above or to depart from 
their native rush patches. | 
