no CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



imal ; hind margins of the head bluntly angulate ; labium similar 

 to that of maculatum (Fig. 7, No. 10), the median cleft extending 

 half its length proximad of the labial palpi. 



Thorax: in some specimens marked with black on the sides; 

 metathoracic wing-cases extending to the middle or hind margin 

 of segment 4, hind femora to the middle of segment 5 or 6. 



Abdomen: uniform brown or the caudal margins of the seg- 

 ments dark ; gills dark, usually with paler band at the middle, the 

 median gill with two pale cross-stripes. 



Measurements ; full grown nymph : total length including gills, 

 40 mm. ; length of hind femora, 8.5 mm. ; metathoracic wing- 

 cases, 6 mm. ; length of abdomen, 19 mm. ; tracheal gills, 13 

 mm. ; length of basal segment of antennae, 4.5 mm. Young 

 nymph : total length, 26 mm. ; length of hind femora, 8 mm. ; 

 metathoracic wing-cases, 4.5 mm. ; length of abdomen, 12 mm. ; 

 gills, 8.5 mm. 



Described from a nymph obtained from Dr. R. H. Howe, and 

 another identified by comparison, in the collection of the Con- 

 necticut Agricultural Experiment Station. 



Adult, male. — ^Color metallic green, sometimes blue. 



Head : mouth-parts black ; antennae entirely black ; labrum 

 and sometimes the clypeus black; clypeus, front, and genae 

 metallic green, and clothed with dark hairs. 



Thorax : metallic green, black and green below ; caudal lobe 

 of the pronotum convex, the margin entire; intersternum green; 

 legs entirely black, the ventral setae much longer than the intervals 

 between them ; wings transparent, except the apical third of each 

 which is smoky ; stigma wanting ; antenodal cross-veins variable, 

 26 in Connecticut specimens. 



Abdomen: green and blue; anal appendages (Fig. 12, No. 5) 

 mostly black, the superiors wholly black, long and curved, spinose 

 on the lateral surfaces, and emarginate on the mesal margins at 

 middle; inferiors black at apex, paler at base, nearly as long as 

 the superiors and each provided with a small apical tooth directed 

 mesad. 



Female. — Color metallic green and buflf. 



Head: proximal half of the second antennal segment with a 

 pale lateral spot ; labrum buff -colored on each side ; exposed por- 

 tions of the mouth-parts including mandibles and their trochantins, 

 bufif. 



Thorax: latero-ventral margins pale, including the cephalo- 

 ventral margins of the mesanepisternum, caudal half of the meta- 

 katepisternum, a stripe along the metapleural suture extending 

 more than half way from the cephalic margin to the wing bases, 

 and the ventral and cephalic margins of the metepimera. and inter- 

 sternum green ; wings slightly smoky, but not darker on the 

 apical third; stigma present, composed of one cell (Fig. 12, No. 

 7), white. 



