500 



NEW YORK STATE MUSEUM 



Nymph. Measures in total length 26 mm; abdomen 15 mm; hind 

 femur 7.5 mm ; width of head 7 mm, of abdomen 9 mm. 



Body of the form of C o r d u 1 i a , or slightly broader, sparsely hairy 

 on appendages and margins; head with hind angles well rounded, the 

 eyes moderately prominent ; labium as in Cordulia, but with 13 or 

 14 mental setae, of which the fifth or sixth (counting from the side) is 

 longest, the four or five internal ones being quite minute ; lateral setae 

 seven; teeth low, crenate, each armed with four or five graduated 

 spinules. 



Abdomen oblong, with not very sharp lateral margins, most narrowed 

 posteriorly on the ninth segment; lateral spines on the eighth and ninth 

 segments, those of the ninth segment about one fourth as long as the 

 body of the segment; dorsal hooks on segments 4 to g, small 

 and erect points on segments 4 and 5, larger and laterally flattened 

 and nearly equal on segments 6-9, but without sharp decurved 

 apices ; ninth segment about half as long on the middorsal as on the mid- 

 ventral line, inclosing the annular tenth segment ; lateral appendages 

 hardly shorter than the equal lateral and superior appendages. 



Somatochlora filosa Hagen 



1861 Cordulia filosa Hagen, Synopsis Neiir. N. Am. p. 136 

 1893 Somatochlora filosa Calvert, Am. ent. soc. Trans. 20:253 (descrip- 

 tion) 

 1900 Somatochlora filosa Williamson, Dragon flies lud. p. 313 



Fig. 24 Somatochlora filosa Hag., end of abdomen ; m aud n of male ; o of female 



This species is recorded from New Jersey and southward, and is very 

 likely to be met with in New York state eventually. 

 Nymph unknown. 



