1870.] 



407 



[Packard. 



anastomosis. On the basal fifth of the vein a branch arises, which 

 subdivides, forming the fourth and fifth median venules. A straight, 



submedian vein is present. Hind wings similar in form to the fore 

 pair, but a little narrower ; a slightly marked subcostal vein, ending 

 opposite the origin of the first and upper branch of the median vein. 

 The median vein subdivides into five branches, the three basal, lower 

 ones arising at nearly equal distances apart, and of nearly the same 

 length ; the first and upper one arising on the outer fourth of the 

 wing; a slightly marked submedian vein. The wings are folded at a 

 low angle over the back. 



Length of body, .10 ; of body with the wings folded, .14 inch. 



I first observed this insect under the loose bark of a stump, moving 

 in groups of several, running swiftly when disturbed, like other Psoci, 

 to a place of concealment, at Brunswick, Maine, early in July. I 

 also found a specimen Sept. 1st, in Salem, Mass. 



Dr. Hagen, the founder of this genus, kindly drew my attention to 

 the great interest attaching to the discovery of this insect in this 

 country, indicating the genus, and that the species was undescribed. 

 In his paper in the " Entomologists' Monthly Magazine," he describes 

 this and the allied genus Perientomum, and describes of the present 

 genus two species from amber, two from Zanzibar in gum copal, and 

 three living forms from Ceylon. 



Pseetra dipterus Burm. 



I took a specimen of this exceedingly rare Hemerobiid insect, at 

 Brunswick, Maine, Sept. 16th. On showing it to Dr. Hagen, he 



