212 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [BuU. 



Tetragoneuria cynosura (Say) 



Journal of the Academy of Natural Sciences of Philadelphia, 8: 30: 

 1839. 



N5miph (PI. IV, Fig. 4). — Color brown and black. 



Head: labium (PI. vii, Fig. 3) extending between the meso- 

 coxae, the median lobe about as long as wide ; mentum with 9 

 setae on each side ; labial palpi with 8-9 teeth on the mesal margin, 

 each tooth with 5 or 6 spines of different sizes ; lateral setae 6 ; 

 antennae pale, the first two segments darker, segments 3 and 6 

 subequal in length; a conspicuous black band between the com- 

 pound eyes, the caudal margin of which follows the opaque portion 

 of the eyes and extends cephalad slightly on the meson; behind 

 the black stripe the surface of the head is spotted with brown, and 

 there is a black line running from each eye to the caudal margin 

 of the head ; these lines are continued on the thorax, gradually 

 widening caudad. 



Thorax: pronotum with caudal ridge, flaring considerably at 

 the sides; a single broad projection over each procoxa extending 

 towards the head ; front and middle femora with two brown rings 

 each, and a trace of black between trochanters and femora; hind 

 femora with a single brown ring ; front and middle tibiae faintly 

 ringed with brown ; tarsi and hind tibiae brown ; hind femora 

 extended parallel to the body reach the middle of abdominal seg- 

 ment 8; wing-cases reaching the middle of abdominal segment 7. 



Abdomen : dark brown above, spotted with pale on the sides 

 and with a broad, dark, dorsal band, the margins of which are 

 undulate; lateral keels with a short spine on segment 8, and a 

 longer one on 9 reaching beyond the apices of the terminal appen- 

 dages (i to 1.5 mm. long) ; dorsal hooks present on segments 2-9, 

 slender on 2-6 inclusive, considerably thicker on 7-9; terminal 

 appendages with lateral appendages about half the length of the 

 inferiors, the superior appendages noticeably shorter than the 

 inferiors. 



Measurements: total length, 16 mm.; length of abdomen, 8 

 mm. ; greatest width, 7 mm. ; length of hind femora, 5 mm. ; 

 length of median lobe, 3.5 mm. ; width, 2-3.5 n^"^- 



A reared specimen and a number of others in the collection of the Con- 

 necticut Agricultural Experiment Station. 



Tetragoneuria cynosura Say variety cynosura Say 



Adult, male (PL xix, b). — Color dark brown to black. 



Head : light brown to yellow ; front without T-spot. 



Thorax : brown with obscure black markings and a yellow spot 

 above and below the metastigma ; thickly provided with gray pile ; 

 legs with coxae, trochanters and profemora brown, remainder 

 black; tibiae each with a flat ridge beneath, which ends in a flat 

 scale-like spur; wings (PI. xii. Fig. i) clear except the base of 



