274 NEW YORK STATE MUSEUM 



•dots on the dorsal side is a double row of broader, obscurer 

 brownish marks close beside the middle pale line. The number 

 of lateral setae appears to be somewhat variable: while six is 

 the normal number, seven occur sometimes; but the species is in 

 such cases distinguishable from b a s a 1 i s by the brown mark- 

 ings just described. 



Libellula plumbea (supposition) 

 I have a single specimen of this species, received from Mr 

 <j. S. Brimley of Raleigh N. C. It is very similar to the nymph 

 of L. c y a n e a , but is at once distinguished by the possession 

 of eight lateral setae on the labium. 



Length 17mm, abdomen 10mm, hind femur 5mm; width of head 

 5mm, of abdomen 7mm (not fully grown). Head with an anvil- 

 shaped black mark on either side of the median ocellus; a pale 

 median line extends from the median suture of the head to the 

 base of the abdomen; segments 2-8 of abdomen each with a pair 

 of large, oblique, brown spots on the sides, becoming diffuse on 7 

 and 8 and the apical portion of each becoming detached as a 

 darker, small, round dot; there is also an outer row of dots 

 blacker on segments 4-9; femora and tibiae faintly twice banded. 

 There are four lines of pubescence each side down the back of 

 the head. 



Lateral setae of labium 8, mentals 12-13, each side of 

 which the outer seven are in a larger series. Dorsal hooks of 

 abdomen on segments 4-8, spinelike on 6-8, and straight on the 

 superior margin differing in this from nymphs of b as a lis, 

 in which the apexes are declined and the upper margin arcuate). 

 The superior appendage is longer and more contracted in the 

 middle and more attenuate to the apex than in b a s a 1 i s . 



I conclude my part of this appendix with a tabular statement 

 of the general features of the habitat of such New York species 

 as I have had good opportunity for observing in the field. Further 

 observation will probably discover that some of these have a 

 M'ider range of habitat; but I trust that this table contains 

 liints that will be of use to the amateur collector. My record 

 for brackish water species is based on a small collection from 

 Sable island sent me by Dr James Fletcher. There is no fresh 

 water there; and the material sent included cast nymphal skins 

 of the two species listed here, taken on the spot. 



