1 88 AXEL LEONARD MELANDER 



and connected with the faint marginal vein by a series of about 

 eighteen oblique, curved, simple cross-veins ; externomedian 

 vein separated from the scapular by a rather broad interval, its 

 five or six branches filling out the apex of the wing ; interno- 

 median vein feeding the greater part of the hind margin with 

 equidistant simple branches ; anal veins numerous, straight, sim- 

 ple, indicating a rather full anal area. Hind wings apparently 

 of the same structure as the fore ones, and of nearly the same 

 extent. The venation is obscured. 



Length of body from base of mandibles to end of last 

 abdominal segment 41™™, mandible 0.7""°, head 3.7°"°, protho- 

 rax 8.3°"", mesothorax 5°"", metathorax 3.5™", abdomen 21°"°, 

 anal cercus 1.2™", hind coxa 3°^", hind femur 6.8™*", hind tibia 

 5.5™", hind tarsus 5.5™", front wing 32'°'", hind wing 26™'°, 

 breadth of head 3°"", prothorax 3.5™™, mesothorax 6"™, metatho- 

 rax 6.7™™, sixth abdominal segment 5.5°"^, eighth abdominal 

 segment 3™'", wing at widest part 12™"^. 



Carboniferous. It was found as an opened iron-stone nodule 

 at Mazon creek, Illinois, only one-half of the concretion being 

 obtained. It represents the dorsal aspect of the insect, and is 

 partially water-worn. 



This species seems to have its nearest relative in Cheliphlebia 

 elongata Scudder, from the same formation, conforming best with 

 the venation of that species. However, the present form differs 

 in the brevity of the mediastinal vein, the narrow scapular area, 

 and the course of the externomedian vein. 



The hind legs are stouter than usual for a neuropteroid insect, 

 with ridges and sulci reminding one somewhat of the sculpture 

 of an orthopterous leg. The swelling of the central part of the 

 abdomen would indicate that the specimen is a female with the 

 basal half of the abdomen distended with ripened ova. The 

 prominence of the tenth abdominal segment shows that the 

 abdomen was carried with a dorsal hump and with the tip 

 directed ventrally, somewhat in the manner of living female 

 Embiidse of today. 



Type. Pal. Coll. No. 9241. 



16. Eucaenus mazonus sp. nov. (Plate VI, Fig. 3; Plate VII, Fig. 10). 



Broad-winged species ; prothorax longer than broad, meso- 



