No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 273 



very small setae, spines beginning on segment 8 ; small dorsal 

 hooks present on segments 4-7, usually longest on 5 and 6, but 

 never as long as the segments ; anal appendages with laterals half 

 as long as inferiors, the superior one-fourth longer, nearly as 

 broad at base as the appendage is long ; inferiors with short setae 

 on sides and mesal surfaces and superior appendage with a few 

 weak setae on dorsum and stronger ones on lateral margins. 



Measurements: total length, 12-15 mm.; length of abdomen, 

 7-9 mm. ; width, 4-5 mm. ; length median lobe labium, 4 mm. ; 

 width, 3.75 mm. 



Adult, male. — Color dark brown or red and black. 



Head : labium, labrum, front and vertex to the antennae light 

 brown or buff with almost black setae ; front immediately cephalad 

 of the antennae and along the margins of the compound eyes 

 darker ; occiput and postgenae brown ; eyes greenish yellow below, 

 brown above when alive. 



Thorax : uniform brown, paler below and approaching a green- 

 ish yellow on the sides ; pronotum with long silken hairs on the 

 caudal margin, which is bilobed. Legs with brown coxae and 

 trochanters, the femora and tibiae sometimes light below, black 

 above (usually entirely black) tenerals dark at tips, light at base; 

 tarsi black, the claws each with a single ventral tooth, which is 

 more than one-half the length of the claw beyond the base. Wings 

 as in PI. XIV, Fig. 3, chlorinate at base only. 



Abdomen : brown, frequently conspicuously red, with terga 4-9 

 black above the lateral carinae ; dorsum of segment 10 dark brown 

 or red ; abdomen considerably compressed beyond segment 3 ; anal 

 appendages brown with a ventral projection about the middle, the 

 latter showing a few small teeth ; accessory genitalia as in Fig. 67, 

 No. 4, the hamules much larger than the auricles. 



Female. — Similar in most features except that the general color 

 is much lighter and there is more black on the caudo-lateral angles 

 of the abdominal terga, the black extending to the cephalic mar- 

 gins ; two dashes each on the sides of the third and fourth terga ; 

 appendages as shown in Fig. 67, No. 10. 



Measurements : total length, male 33-34, female 33 mm. ; abdo- 

 men, male 21, female 21-33 mm.; length of hind wings, male 25, 

 female 24-26 mm. ; width of hind wings, male 9, female 9 mm. 



There are two recognized varieties of rubicundulum, — 6". ruhi- 

 cunduluvn assimilatuni, and rubicundulum decisum, the latter an 

 essentially western form. Var. assimilatuni is said to be common 

 in New York, and differs from the usual form in having the yellow 

 color of the front wings extend to the nodus. 



Connecticut. — South Manchester, 3 August, 1896 (W. C. S.) ; West- 

 ville, 28 August, 1901 (W. E. B.), 9 August, 1906 (P. L. B.) ; New Haven, 

 16 June, 1902 (E. J. S. M.), 12 August, 1902 (B. H. W.), 16 September, 

 1903 (W. E. B.), 16 October, 1903 (H. L. V.), 6 August, 1917 (M. P. Z.) ; 

 Branford, 21 June, 1904 (H. L. V.) ; Short Beach, 14 July, 1904 (P. L. B.) ; 



