362 



Satf^s DescrijHions of 



\ 



with a yellow band on the middle or before it, of each 

 segment, excepting the last ; the second band interrupted 

 into two transverse, oval spots : venter with a longitudinal, 

 lateral spot on the second segment and a transverse lateral 

 one on the third, yellow : tarsi and intermediate and 

 posterior pairs of tibice piceous ; a yellow spot on the 

 posterior coxae. 



Length half an inch. 



Var. a. Middle of the thorax with a small double 

 yellow spot. 



The observations which I had occasion to make relative 

 to the generic affinities of Plesia marginata, Nob., are 

 exactly applicable to this species. It agrees precisely 

 with Jurine's character of Plesia, but differs from Mi- 

 ziNE, Latr. by having the mandibles entirely destitute of 

 teeth, a character which it has in common 'with Mekia, 

 111., but the form of its wing-scale, will not admit of its 

 J}eing referred to the latter genus ; I have, however, in 

 this instance, been guided by the characters laid down by 



in the Regne Animale (first Edition). 



margindta. (Plesia marginata, Nob., Western 



M 



Q 



-l ^ i-. 



M 



coUdris. Collar with an interrupted band and 

 two spots yellow. 



Inhab. Indiana. 



Body black : head with two spots above the antennae, 

 frontal orbits, and dilated line behind the eyes, yellow : 

 mandibles dark piceous, black at tip : collar with an 



band 



thorax 



the wings: iving-scale dull honey-yellow with a yellow 

 spot : wings yellowish, fiiliginou^, dusky on the costal 

 margin towards the tip ; behind the scutel is a transverse 



