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



similar in shape, 5 mm. by 1.5 mm.; mesonotum with a single 

 oval spot, metanotum with two similar contiguous spots ; wings 

 clear ; anal triangle 2,-3 celled ; 2 cubito-anal cross-veins, i cross- 

 vein in the triangle, supertriangle and basilar spaces usually free, 

 antenodal cross-veins 18-20 in front wing and 14-15 in the hind; 

 postnodals 12-15 ^^ front wing; legs black, lighter at base; femora 

 with 2 irregular rows of short spinules, the front tibiae with the 

 usual flat scales ; middle and hind tibiae with the cephalic row of 

 setae replaced by small tubercles with a small seta alongside ; tarsi 

 with apical segment as long as the two basal ; tarsal claws about 

 as long as the median tarsal segment, the ventral tooth placed 

 beyond the middle. 



Abdomen (Fig. 13, No. 3) ; dark brown with a yellow spot on 

 the auricles of segment 2, and arrow-shaped yellow spots on the 

 dorso-meson of segments 2-8 ; a small subcircular spot on i and 

 the base of 9; segment 10 entirely black; venter of 8 with a pale 

 spot ; terga contiguous on the ventro-meson in segments 3-8 ; 

 superior anal appendages short, with a ventral tooth ; inferior 

 appendage about as broad at tip as at base, the lateral angles each 

 with two small recurved dorsal teeth ; accessory appendages with 

 cephalic lobes much wrinkled but without the distinct lateral 

 depression; hamules slender, hook-like; genital lobes with short 

 marginal spinules and delicate hairs. 



Female. — Similar in nearly all points to the male; ovipositor 

 about twice as long as segments 9 and 10 together. 



Measurements: total length, male 63-75, female 75-78 mm.; 

 length of abdomen, male 47-56, female 55 mm. ; length of hind 

 wings, male 42-46, female 50 mm. ; width of hind wings, male 11- 

 13, female 14 mm. 



Connecticut. — Westville, 10 June, 1905 (W. E. B.) ; Orange, 13 June, 

 1922; Hamden, 19 June, 1922 (P. G.). 

 New England. — May 27-July 7. 



Family GOMPHIDAE 



Nymphs. — Flat, sprawling insects inhabiting the bottoms of 

 slow streams and small lakes ; labium flat, the mentum without a 

 median cleft ; antennae usually composed of about four segments, 

 of which the third is greatly modified, being either much longer 

 than any of the other segments or both longer and wider, and in 

 some cases almost spoon-shaped ; abdomen usually tapering at the 

 caudal end, sometimes broad and flat. 



Adults. — With widely separated compound eyes ; the labium 

 with mentum entire, and without a median notch; tibial spines 

 always simple and in no case replaced by small tubercles ; wings 

 always with an oblique cross-vein behind the proximal end of the 

 stigma; female without a long ovipositor, the vulvar lamina con- 

 sisting of small lobes or plates on the ninth sternum. 



