406 ACADEMY OF NATURAL SCIENCES 



LESTES Leach. 



1. L. RECTANGULARis. — Wings divaricated 3 forceps acutely 

 bidentate beneath. 



Inhabits Indiana and Massachusetts. 



3 Body dull greenish, more or less tinged with cupreous ; 

 head above black, with a very slight coppery tinge : each side of 

 the mouth yellow ; labrum bluish yellow; mandibles piceous at 

 tip ; eyes (when recent) ultramarine ; thorax with the dorsal 

 suture and lateral vitta, varying from pale yellowish to verditer 

 green ; wings hyaline, cellules chiefly pentagonal ; stigma black- 

 ish, its length nearly three times greater than its breadth ; abdo- 

 men nearly as long again as the wings; tergum with the basal 

 segments a little paler, darker at their tips, and with a hardly ob- 

 vious whitish, interrupted band at their bases ; ultimate seg- 

 ments much darker; anal segment with a longitudinal carina 

 beyond the middle ; forceps shorter than the two ultimate seg- 

 ments taken together, with two oblique, very acute teeth be- 

 neath ; beyond the middle curved downward and inward, so as 

 to become nearly perpendicular to the basal half; inferior pro- 

 cesses almost reaching the incurved tip of the forceps; beneath 

 pale, whitish, more or less tinged with yellowish-green. 



Length over two inches. 



9 Abdomen much shorter than in the male ; tergum with a 

 more obvious cupreous color ; feet (as in the male) pale yellow- 

 ish, with two black lines on the thighs and one on the tibiae. [35] 



Length one inch and seven-tenths. 



This species made its appearance here about the middle of 

 August. It may at once be distingushed, when at rest, from the 

 apicalis, by its divaricating wings. It resembles a South Ameri- 

 can species, which, not finding described, I have called undulata,* 

 but the abdomen of that insect is much shorter. 



*L. UNDULATA. — Wings divaricated ; forceps undulated at tip. 



Inhabits South America. 



S Body pale ; head with a broad green band between the eyes ; thorax 

 with a double green vitta ; wings hyaline ; cellules chiefly pentagonal ; 

 stigma light brown ; abdomen not one-third longer than the wings, cop- 

 pery green above, whitish at tip ; forceps as long as the two preceding 

 segments taken together, undulated at tip ; on the basal half not dilated, 

 and having beneath two remote teeth, of which the basal one is very 

 obtuse in form of a lobe. 



Length one inch and three-fifths. 



[Vol. VIII. 



