No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 25 1 



Connecticut. — Whitneyville, 18 July, 1904 (P. L. B.) ; New Haven, 20 

 July, 1904 (B. H. W.), 27 June, 1905 (W. E. B.) ; Branford, 21 June, 

 1904 (H. L. V.) ; West Haven, 29 June, 1905 (W. E. B.) ; Cornwall, 10 

 August, 1918 (K. F. C.) ; Durham, 15 June, 1919 (M. P. Z.) ; New London, 

 15-22 June, 1921 (R. H. H.) ; Hamden, 30 May, 1922 (P. G.). Common 

 throughout the State. 



New England. — May 30-September 8. 



Libellula quadrimaculata Linnaeus 



Systema Naturae, i : 543 : 1758. 



Nymph. — Similar in form to other Libellulas ; labium with 7 

 lateral setae on palpi, and 11-12 notches in the mesal margin; 

 mental setae about 13, the distal margins with a number of serra- 

 tions between each marginal spinule. 



Abdomen with dorsal setose spines or hooks on segments 4 to 8 

 inclusive, the spines themselves hidden among the setae ; lateral 

 spines of 8 and 9 short, incurved. 



Measurements: total length (exuviae and mature nymph), 25 

 mm. ; length of abdomen, 14-15 mm. ; greatest width of abdomen, 

 7 mm. ; length of hind femora, 6 mm. 



Adult, male (PI. xxi, Fig. 4). — Color brown and black. 



Head : labium light brown or yellow with a black median stripe 

 which extends over the mentum, entirely covering it; labrum 

 brown with a black ventral margin ; clypeus and front brown, 

 vertex somewhat darker and concave at tip ; occiput and postgenae 

 black with two yellow spots on each side behind the caudal margins 

 of the compound eyes. 



Thorax: prothorax brown, the caudal lobe entire and provided 

 with a fringe of hairs ; meso- and metathorax olive-brown and 

 yellow with the mesopleural and metapleural sutures darker, the 

 dark stripes widened just behind the two katepisterna, and both 

 connected with a dark triangle just behind the mesocoxae; legs 

 dark brown or black, claws lighter and much wider proximad 

 of the ventral tooth than beyond it ; wings each with a nodal spot, 

 not extending caudad of R ; front wings with clear yellow from 

 base to beyond arculus, sometimes to stigma ; the hind wings, also 

 with clear yellow from base to tip of triangle and along the costal 

 border; cubito-anal cell, triangle, and a somewhat triangular area 

 behind extending half way to the anal angle, dark brown to nearly 

 black ; membrane nearly white, antenodal cross-veins yellow. 



Abdomen : densely pilose, the third segment only with a trans- 

 verse median carina; color dark brown to black, segments 1-5 

 lighter, 5-10 darker; the terga 5-9 with buff -colored dashes just 

 above the lateral carinae ; ventral surface of terga 4-8 with a pale 

 spot on each side; anal appendages brown, the superiors about 

 twice as long as the inferior; hamules of the second segment 

 composed of a pair of large mesal-hooks and a much reduced 

 lateral lobe directed caudad. 



