No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 283 



segment 8 extending to middle of segment 9; lateral spine on 9 

 reaching beyond the tips of the lateral, but not to the tips of the 

 superior or ventral appendages. The ventral surface of the abdo- 

 men is usually transversely striated with dark stripes, or provided 

 with rows of spots, differing in this from Sympetrum or other 

 species of similar form. 



]\Ieasurements : total length, 16 mm.; length of hind femora, 

 4-4.5 mm. ; length of hind wing-cases, 5 mm. ; length of abdomen, 

 10 mm. ; greatest width, 6 mm. 



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



Head : labium dark brown to black, black on sides ; labrum, 

 clypeus and front (except the dark line in front of the ocelli, 

 which is black) pure white; vertex shining black, dark brown in 

 front, occiput and postgenae black or dark brown. 



Thorax : very dark brown without conspicuous pale markings 

 of any sort, prothorax black, the meso- and metathorax very dark 

 brown with obscure black along the sutures, wing bases and on 

 the shoulder of the mesepimerum ; legs entirely black or very dark 

 brown, the coxae, however, somewhat lighter; procoxae winged 

 beneath, the ridge thickly beset with hair-like setae ; all femora 

 with one dorsal and one ventral carina, the latter with very short 

 spines except near the apex, where they are longer; claws with a 

 short ventral tooth, the length of which is less than one-half the 

 length of claw beyond tooth ; wings clear, except very small spots 

 on base of front wings (sometimes chlorinated to nodus), and 

 others occupying 4-6 cells (PI. xv, Fig. 4) at the base of the hind 

 wings. 



Abdomen : variable, sometimes almost entirely black ; with a 

 yellow spot on the sides of segment 2 and another on the dorsum 

 of 7 at base sometimes on 3 to 6 ; venter black ; appendages black ; 

 accessory genitalia, with hamules consisting of mesal hooks, or 

 front lobes, the caudal lobes curving completely around and coming 

 in contact above the first lobes on the meson. 



Female. — Color similar to male except that there are short 

 lateral and dorsal dashes of yellow on abdominal terga 3, 4 and 5. 

 The female genitalia consist of small tubercles arising from the 

 striated ventral plate of segment 9, and two widely separated lobes 

 arising from the caudal margin of 8 ; anal appendages black. 



Measurements : total length, male 30-33, female 29-33 mm. ; 

 length abdomen, male 21, female 19-22 mm.; length hind wings, 

 male 25, female 23-25 mm. ; width hind wings, male 8, female 

 8 mm. 



A rather common species taken in several different localities. 



Connecticut. — Hamden, 17 June, 1904 (H. L. V.) ; New Haven, 4 July, 

 1905 (H. L. V.) ; Mount Carmel, 6 June, 1908 (B. H. W.) : Lyme, 16 

 June, 1918 (B. H. W.) ; New London, 6-22 June, 1921 (R. H. H.), 27, 30 

 May, 1922 (P. G.). Also collected at Litchfield (L. B. W.), various dates. 



New England. — May 17-August 3. 



