206 THE CANADIAN NATURALIST. [May 



evidently a portion of an upper wing ; the insect measured not far 

 from three one-half inches in expanse of wings. 



Fi<r. 4. 



" Lithentomfm Harttii Scudder ; (Fig. 4.) — This was 

 the first specimen discovered by Mr. 0. F. Hartt. I have 

 therefore named it after him : — apparently, it docs not 

 belong to any family of Neuroptera represented among living 

 forms. It agrees more closely with the family Hemeristina, 

 which I founded upon a fossil insect discovered in Illinois, 

 than it does with any other ; but is quite distinct from that, 

 both in the mode of division of the nervures and in the peculiar 

 cross-veining. The fragment which Mr. Hartt discovered is 

 very imperfect ; but, fortunately, preserves the most important 

 parts of the wing. I am inclined to think that it was a lower 

 wing. The insect probably measured three one-half inches in 

 expanse of wing. 



Fig. 5. 



" Xenoneura antiquorum Scudder ; (Fig. 5.) — Although 

 in this fragment we see only the basal half or third 

 of a wing, the peculiar mode of venation shows that the 

 insect cannot belong to any known family of Neuroptera 

 living or fossil ; yet it is evidently a neuropterous insect. In 

 addition to its other peculiarities, there is one of striking 

 importance, viz.: — the development of veinlets, at the base of the 

 wing, forming portions of concentric rings. I have endeavored in 

 vain to explain these away as something foreign to the wings, 

 accidentally introduced upon the stone ; and I know of nothing to 

 which it can be compared but to the stridulating organ of some 

 male Orthoptera ! It is difficult to tell whether the fragment 

 belongs to an upper or an under wing. Its expanse of wings was 

 probably from two to two one-half inches." 



