262 NEW YORK STATE MUSEUM 



1898 Nehallennia posita Davis, N. Y. Ent. Soc. Jour. G:VM (listed 



from Staten Island) 



1899 Nehallennia posita Kellicott, Odon. Ohio, p.SO 



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 111. in June 1896. 

 The cast skin is lacking in gills, and is distinguishable from that 

 of I. V e r t i c a 1 i s 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.l5, c], an interrupted line of blackish dashes 

 along the axis; a spot before the middle followed by a blackisk 

 crescent band. 



ANOMALAGRIOX 



There is a single species. 



Anomalagrion hastatum Say 



Plate IS, fig. 6, 7 

 1838 Agrion hastatum Say, Acad. Nat. Sci. Phila. Jour. 8:38 

 1857 Agrion hastatum Selys, Sagra's Hist. Cuban Ins. p.469 

 1876 An o m al a gr i n hastatum Selys, Acad. Belg. Bui. (2> 



41:255 

 1893 Anomalagrion hastatum Calvert, Am. Eut. 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. Eut. Soc. Jour, 



6:196 (listed from Staten Island) 



1899 Anomalagrion h a s t a t u m Kellicott, Odon. Ohio, p.49 



1900 A n o m ala gr i o n 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. 



