No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 213 



the hind wings, where there are usually two well-separated areas 

 of infuscation. This color may reach the base of the triangle but 

 is usually less in extent. 



Abdomen : brown to nearly black ; the first two segments and 

 half the third entirely brown ; terga 3-10, black with longitudinal 

 yellow spots on the sides of 3-9, just above the lateral carinae; 

 venter of terga 3-8 mostly yellow, somewhat darker on the caudo- 

 lateral angles ; segments i and 2 much thicker than the following 

 segments, which are not at all compressed or narrowed but 

 depressed ; anal appendages black, the superiors without ventral 

 or apical teeth; accessory appendages of the second segment as 

 in Fig. 63, No. 13. 



Female. — Very similar to the male ; tibial ridges absent ; seg- 

 ment 2 with a conspicuous yellow spot below ; abdominal segments 

 3-6 compressed ; hind wings with almost no pigment at base ; 

 vulvar lamina projecting to the middle of the tenth abdominal 

 segment. 



Measurements : total length, male 40-43, female 38-40 mm. ; 

 length of abdomen, male 27-29, female 25-28 mm. ; length of 

 hind wing, male 28-30, female 29-30 mm. ; length of stigma, male 

 and female, 1.5-2 mm. 



There are two recognized varieties of T. cynosura,^^ c. cynosura 

 Say and c. siiimlans Mutt., which differ only in the extent of the 

 pigment at the base of the hind wings. In c. simulans the pig- 

 ment extends from the base to the tip of the triangle, while in 

 c. cynosura the color may reach the base of the triangle but is 

 usually less extensive. The variety cynosura is the more common 

 in Connecticut. 



Connecticut. — West Thompson, 12 July, 1905 (H. L. V.) ; New Haven, 

 10 June, 1906 (B. H. W.) ; Mount Carmel, 6, 19 June, 1908 (B. H. W.) ; 

 New London, 6-22 June, 1921 (R. H. H.) ; Hamden, 22, 27 May, 8 June, 

 1922 (P. G.) ; Litchfield, 16 June, 1925, also other dates (L. B. W.). 



New England. — April-July. 



Tetragoneuria canis McLachlan 



Entomologists Monthly Magazine, 23: 104: 1886. 



Adult, male. — Color brown, black and yellow. 



Head: buff, front without T-spot. 



Thorax: brown or olivaceous, with gray pile, and with obscure 

 lateral lines of black; wings with brown spot at base of hind 

 wing occupying somewhat more than half the anal triangle in the 

 specimen at hand. 



Abdomen : black, the first two segments olive ; terga 2-9 black, 

 with longitudinal yellow spots on each side above the lateral 

 carinae ; venter of terga 3-9 mostly yellow, the caudal half or third 

 black ; superior anal appendages with a dorsal protuberance three- 



** Muttkowski, R. A. Bull. Wis. Nat. Hist. Soc, 9: 91-134: 1911 and 13: 46-61: 1915. 



