2 74 CONNECTICUT GEOL. AND NAT, HIST. SURVEY [Bull. 



Westbrook, 30 August, 1904 (H. L. V.) ; Stonington, August, 1906 

 (J. A. H.) ; Storrs, 4 October, 1923 (J. Cronin). Common throughout the 

 State. 



New England. — June 9-October 9. 



Sympetrum semicinctum Say 



Journal of the Academy of Natural Sciences of Philadelphia, 27 : 1839. 



Adult, male. — Color buff to brown and red. 



Head : Face including labium, labrum, clypeus, front, and ver- 

 tex, brown, considerably darker in front of the antennae ; vertex 

 projecting over median ocellus in a single lobe, the apex lighter 

 in color ; occiput yellow, postgenae dark brown with yellow spots 

 along the lateral margins behind the compound eyes. 



Thorax : brown, the lateral and ventral surfaces slightly, if at 

 all lighter ; legs black except the coxae, trochanters and venter of 

 first femora, which are dark brown ; tarsi black, the claws having a 

 tooth beneath which measures less than half the length of the claw 

 beyond the tooth ; base of fore wings yellow about half way to 

 nodus from the base, the hind wings yellow to the nodus, and a 

 darker crescent-like yellow area from the nodus to the anal angles. 



Abdomen : dark red or brown with median transverse carinae 

 on terga 2 and 3 ; terga i and 2 lighter brown, the lateral margins 

 of 5-10 black, the black area on each side wider caudad; venter 

 of 3-10 black; accessory genitalia as in Fig. 67, No. 2, the 

 auricles not longer than the hamules ; anal appendages only with 

 small ventral teeth on the brown superiors near apex; inferior 

 black. 



Female (PI. xxii, a). — Abdomen darker than the male, with 

 black lateral margins on 2-10, the black spreading over the entire 

 dorsum on 5-10 and sometimes enclosing small subcircular pale 

 spots on 8 and 9, venter of abdomen mostly black; female abdo- 

 men shown in Fig. 67, No. 8. 



Measurements : total length, male 30, female 27 mm. ; length 

 of abdomen, male 19, female 16 mm.; hind wings, male 21-23, 

 female 20 mm. ; width of hind wings, male 8, female 7-8 mm. 



A rather common species distinguishable from most others of 

 this genus by the great extent of the flavescent area of the base 

 of the wings ; from 5^. riibicimdnlum assiinilatmn, its nearest ally, 

 by the presence of a large median ventral tooth on the superior 

 anal appendages of the male (in assimilattim) . 



Western representatives of this species are much larger, the 

 abdomen measuring as much as 26 mm., and the yellow color of 

 the front wings sometimes reaching the nodus. 



Connecticut. — Chapinville, 29 August, 1904 (W. E. B.) ; North Haven, 

 3 August, 190.S (H. L. V.) ; Manchester, 3 September, 1920 (P. G.) ; 

 Guilford, 30 July, 1922 (W. E. B.). 



New England. — June 29-October 5. 



