890 ACADEMY OF NATURAL SCIENCES 



spots, and on tlie posterior margin an interrupted band ; remain- 

 ing segments having the same markings as the third, together 

 with a large double lateral longitudinal spot, excepting the ulti- 

 mate and the caudal segments, which have only the posterior in- 

 terrupted band ; caudal segments two-thirds the length of the 

 preceding one j anal processes as long as the two preceding seg- 

 ments, undulated, foliaceous, with a longitudinal line in the mid- 

 dle, dilated on the inner edge beyond the middle, near the inner 

 tip, hairy, and with a tooth, and rounded prominence ; at tip 

 rounded, with a prominent cylindric spine ; inferior process half 

 the length of the superior ones ; feet piceous, or blackish ; an- 

 terior thighs with a glaucous line behind. 



Length less than three inches. 



The third abdominal segment is remarkably contracted. The 

 posterior interrupted bands might be called rounded or qu adrate 

 spots, and are largest and more glaucous on the posterior seg- 

 ments. It resembles Lihellula tenebrosa ? 



4. M. CLEPSYDRA. — Abdonlen contracted near the base, with 

 interrupted bands ; anal processes foliaceous. 



Inhabits Massachusetts. 



This is so much like constricta S., that it may possibly prove 

 to be a variety. Nevertheless, the anal [13] appendices are 

 very different. These are foliaceous, oblong-oval, gradually nar. 

 rowed at base, with a small angle at tip ; upper side with a cari- 

 nated line ; caudal segment of the abdomen with an elevated 

 compressed tooth near its base above. 



Length less than three inches. 



The only individual I have seen was sent me by Dr. Harris. 



5. M. VINOSA. — Abdomen contracted near the base ; wings 

 very slightly tinged with ferruginous ; stigma yellowish ; pleura 

 with two bright yellow orbicular spots. 



Inhabits Massachusetts. Harris. 



Length over two inches and a half. 



Resembles dejysi/dra S., very closely, but it may be distin- 

 guished by the color of the wings and stigma, the bright orbi- 

 cular spots of the pleura, the yellow antennae, and the absence of 

 black markings iu the summit of the frontal vesicle. The anal 



[Vol. VIII. 



