No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 275 



Sympetrum obtrusmn Hagen 



Stettiner Entomologische Zeitung, 28: 95: 1867. 



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



Head : face including labium, labrum, clypeus, front and vertex 

 (except the black basal line surrounding the antennae) yellow; 

 occiput and postgenae darker, with some yellow. 



Thorax: uniform dark brown; the wings colorless, with a touch 

 of yellow at base of hind wings ; legs black, except the coxae, 

 trochanters and ventral surfaces of front legs, which are dark 

 brown ; tarsal claws each with a tooth beneath, which is much 

 less than half the length of the claw beyond the tooth. 



Abdomen: dark brown or red, considerably contracted behind 

 segment 3, and somewhat widened towards the tip ; median trans- 

 verse carinae on segments 2 and 3 ; caudo-lateral angles of the 

 terga above the lateral carinae, black on segments 4-9, venter of 

 abdomen dark brown ; anal appendages brown, the superiors with 

 a conspicuous, denticled ventral tooth on each ; accessory genitalia 

 of the second segment as shown in Fig. 67, No. 3. 



Female. — This sex is said to be olive-brown in color with a 

 reddish tinge. 



Measurements : total length, male 33-37 ; abdomen, male 22-25, 

 female 22 mm. ; length hind wing, male 24-25, female 24 mm. ; 

 width hind wings, male 8, female 8.5 mm. 



Calvert's measurements are as follows : abdomen, male 22-25, 

 female 23.5-24 mm.; hind wing, male 21-25, female 23-25.5 mm. 



A single male in our collection bears the label Westbrook, 30 

 Aug., 1904, H. L. Viereck, The only reliable means of dis- 

 tinguishing this species from ruhicundulum lies in the shape of 

 the hamules of the accessory genitalia. The female is apparently 

 not distinguishable from ruhicundulum. There are also two varie- 

 ties of this species, but only the eastern variety, S. obtrusmn 

 ohtrusum, is represented in our fauna. 



New England. — July 3-October 5. 



Sympetrum vicinum Hagen 

 Synopsis of the Neuroptcra of North America, 175: 1861. 

 Nymph. — Head nearly twice as wide as long; the caudo- 

 lateral angles rounded, and with rather long, heavy setae (.25 

 mm.) ; labium with 9 lateral setae on palpi, the mesal and caudal 

 margins of proximal segment with setae, in pairs on mesal margin 

 (one large and one small) but no teeth; movable hook similar to 

 lateral setae; mentum with 11 setae each side (Needham, 12 or 

 13) ; the distal margin with about 5 very minute spines, and 

 rounded lobes at the base of the palpi ; palpi conspicuously spotted 

 beneath ; labium extending between second pair of legs. 



Thorax: Prothorax with rounded, setose lateral angles, which 



