n.] 354 [March 25, 



Hab. One male in the Harris Collection, the type of Say, from 

 Massachusetts, and another from Sutton, Mass., June 15, 1865; the 

 male type of Rambur in De Selys' collection ; one male from Milton, 

 Mass., in the Museum collection; a female from Brookline, Mass., 

 June 8, 1864, in the Museum of the Society of Natural History, and 

 three in the Museum collection, two from Massachusetts, and one 

 from the Detroit River, Mich., where according to H. G. Hubbard, 

 the species is common in August. Finally Georgia from Abbot's 

 drawings. This species is a very rare one in collections; De Selys 

 forms for it his genus Gomphajschna. 



A number of nymphae from the Detroit River belonging, as Mr. 

 Hubbard presumes, to this species, have a very peculiar appearance 

 by their variegated coloration. The general color is dark gray^ but the 

 two basal and the eighth segment of the abdomen are pale whitish. 



8. JEsehna Antilope spec. nov. Female, No. 51, LeConte. 



This species is very similar to ^E. fare illata, but differs as follows: — 



Male. 1. The labium is entirely luteus. 



2. The head is more orbicular, the eyes less flattened 



above . 



3. The vertex is yellow on each side. 



4. The dark bands on the sides of the thorax are less de- 



veloped; the first is brown, narrower, 'abbreviated, 

 the superior half wanting; the second one is black- 

 ish, but narrower ; the thorax below has only black 

 lines instead of black spots. 



5. The femora,bright rufous throughout. 



6. The abdomen is more inflated, ovoid at base, the third 



segment less contracted, and the abdomen gradually 

 tapering from the contraction, much narrower on tip. 



7. The pattern of the coloration similar, but the apical 



spots on the segments larger, quadrangular; the last 

 segment even with large spots on sides. 



8. The last segment much more impressed on tip, and in 



the middle a well developed crista, only indicated in 

 JE . furcillata. 



9. The superior appendages of the same shape and length, 



but straight, not bent down or inwards ; the inferior 

 appendage much narrower, the two branches with an 

 apical distance of a little more than one millim. (two 

 and one half in JS. furcillata). The genital parts in 



