400 ACADEMY OF NATURAL SCIENCES 



wings immaculate, or with a tinge of ferruginous at their origin, 

 particularly of the posterior pair, and on the middle ; anal mem- 

 brane blackish ; stigma rather large and blackish ; feet black ; 

 coxse and trochanters yellow ; inferior side of the anterior thighs 

 yellow • abdomen with a dorsal black vitta, including the carina, 

 and a lateral black vitta above the lateral carina; lateral carina 

 black ; these vittae are more and more widely confluent at the 

 sutures, towards the tip of the abdomen, which is entirely 

 black. [26] 



Length from one inch and a half to one inch and three-quarters. 



It may be distinguished by the blue top of the frontal vesicle, 

 and the ferruginous mark at base of the wings. The ferruginous 

 cloud on the middle of the wings is often altogether wanting. 

 It also varies in having no abdominal vittae, excepting a vestige 

 at base. The blue color sometimes extends down the front. The 

 abdomen is also sometimes blue, and the thorax sometimes black. 

 Drury describes the abdomen of the female as yellow, with black 

 annulations, and that of the male blue. 



The inferior anal process is at least two-thirds the length of 

 the superior ones, which are arcuated, with a tooth beneath near 

 the tip, and at tip acute. 



A specimen from Dr. Harris. 



14. L. RUBicuNDULA. — Abdomen sanguineous, with a lateral 

 black vitta; wings pale ferruginous at base; anal appendices in 

 the male with a tooth on the inferior middle. 



Inhabits Indiana and Massachusetts. 



Male. — Eyes brown, in contact above ; front greenish-white ; 

 mouth pale yellowish ; thorax obscure brown, immaculate ; be- 

 tween the wings a little tinged with dull sanguineous ; wings with 

 a very small ferruginous spot at base, not over one-tenth of an 

 inch in length, more evident on the inferior wings ; stigma brown; 

 about nine marginal cellules between the stigma and middle of 

 the wings ; tergum bright sanguineous, above carinate, immacu- 

 late, on each side a black line, which dilates [27] towards the 

 tip of each segment ; anal appendices deflected, longer than the 

 inferior conic one, mucroaatc, and with a strong tooth on the in- 

 ferior middle ; feet blackish, venter pale. 



Length one inch and a half. 



[Vol. VIII. 



