No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 257 



Female. — The wings differ from those of the male in having a 

 brown apex and nodal spot instead of the broad median band. 

 The yellow of the abdomen is continued onto the second abdominal 

 terga, the light spots of 2, 3 and 4 being more or less continuous. 

 Female appendages (Fig. 63, No. 2) consisting of two widely- 

 separated lobes on the caudal margin of segment 8, and two small 

 tubercles on the 9th sternum; width of abdominal segments 1-8 

 equal, 9 and 10 greatly narrowed. 



Measurements : total length, male 45, female 42 mm. ; length 

 of abdomen, male 25, female 25 mm. ; length of hind wing, male 

 30, female 33 mm.; width of hind wing, male 9-10, female lo-ii 

 mm. ; length of stigma, male and female, 4 mm. 



Very similar in general appearance to Libellula pulchella Drury, 

 but smaller in size. The male differs in wing coloration and struc- 

 ture of the first abdominal sternum. The female is much shorter 

 and broader than pulchella and the sternum of segments 8 and 9 

 serve to distinguish it. 



Connecticut. — Branford, June, 1905 (H. W. W.) ; East Haven, 19 June, 

 1908 (B. H. W.) ; Hamden, 19 June, 1922 (P. G.) ; Mansfield, May, 1923 

 (L. B. P.). 



New England. — May 10- September 23. 



Tribe Palpopleurini Tillyard 



A tribe represented in New England by a single genus. The 

 nymphs possess a dorsal hook on abdominal segment 9 which dis- 

 tinguishes them from other tribes. The adults are small species, 

 though usually very active ; the wings of the two sexes are 

 different (see PI. xiii. Figs. 2, 4), and are less than 20 mm. in 

 length. 



Genus Perithemis Hagen 



Nymphs. — Head : labium with setif orm movable hooks ; five 

 lateral and nine mental setae. Abdomen with dorsal hooks on 

 segments 3-9, and lateral spines on segments 8 and 9; superior 

 anal appendages not decurved. 



Adults. — Wings with less than ten antenodal cross-veins in the 

 front wings"; stigma more than three times as long as broad and 

 supported by two to three cross-veins ; triangle 3-sided, about as 

 far distad in the hind wings as in the front ; M, not sinuate ; 

 subtriangle absent in hind wings ; Cu^ usually arising exactly from 

 the caudal angle in both wings ; hind margin of prothorax bilobed 

 and with long hairs ; abdomen of male without ventral hooks on 

 first segment ; transverse median carina present on terga 3 and 4. 

 General color brown and yellow, size small. 



Our only member of the genus is a small but wary individual 

 frequently seen skimming over the surface of ponds or lakes, 

 alighting on reeds or projecting sticks, but keeping well beyond 



