FAUNA OF THK DEVONIAN l'f.AN'I -1U.1 is or si JoiiN. 



525 



but it is very interesting to find, in addition to minor peculiarities, 

 tliut near the base of the wing, between the two middle veins, then 

 is a heavy cross-vein from which new prominent veins take their 



Fig. 182. — Homothctus fossilis, Scuddcr. 



rise ; this is characteristic of the Odonata, and of that family 

 only. We have, therefore, a new family representing a synthetic 

 type which combines the features of structure now found in the 

 Odonata and fcialina, very distant members of the Neuroptera. 

 The fragment is sufficiently preserved to show the direction, extent, 

 and mode of branching of nearly every principal nervure. It is 

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

 from 3i inches in expanse of wings." 



Fig. 183. — Lithcntomum Ilarttii, Scudder. 



" This was the first specimen discovered by Mr C. F. Hartt, and 

 I have, therefore, named it after him : — apparently, it docs ni it 

 belong to any family of Neuroptei'a 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 ncrvures 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 3-£ inches in expanse of wing." 



Fig. 184. — Xenoneura antiquorum, Scudder. 



"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, 





