CA RBONIFEROUS ARTHROPOD FA UNA 1 89 



and metathorax quadrate. Abdomen elongate-ovate, no median 

 keel present. Wings very broad. Legs short, moderately 

 strong, punctulate. 



Head ovate, about two-thirds as long as the prothorax, 

 rounded on the posterior angles ; eyes bulging, hemispherical, 

 not large ; mouth-parts not defined. Prothorax broadly ovoid, 

 rounded behind, straight in front ; meso- and metathorax gradu- 

 ally broader posteriorly, their side angles rectangular. Abdomen 

 broad, elongate-oval, more or less depressed, consisting of ten 

 segments, including the segment mediaire, broadest at the sixth 

 segment, and then gradually and broadly rounded to the tip ; 

 only the base of the anal stylets visible ; last segments not cari- 

 nate. Legs short, femora stout, compressed; femora and tibiae 

 minutely and closely punctulate : on the forward side of each 

 femur is a longitudinal boss near the inferior edge. Wings very 

 broad, longer than the abdomen ; the costal margin evenly 

 rounded, except at the axillary angle of the hind wings, where 

 it is strongly shouldered ; mediastinal vein straight, oblique, dis- 

 tant from the marginal at its base and connected with it by 

 numerous oblique, straight cross-veins ; scapular vein close to 

 the niediastinal, the other veins obliterated. Under wings with 

 numerous branches to the externomedian. 



Length of body 24™™, of prothorax 4.5™"', of mesothorax 3™™, 

 of metathorax 3.4"", of abdomen lo™"", of fore wing 20™°*, of 

 front femur 3.3""°", of hind femur 6.3""°, of hind tibia S.S"""". 

 Breadth of prothorax 3™™, of mesothorax 3.8""", of metathorax 

 4.7™™, of sixth abdominal segment 5.5°"°, of front wing 8""". 



Described from a specimen represented on both sides of an 

 ironstone nodule from the Carboniferous beds at Mazon creek, 

 Illinois. 



This species seems certainly to be congeneric with ovalis 

 Scudder, and may possibly be the same form. In some respects 

 the state of preservation is better than that of Dr. Scudder's 

 specimen, portions of the head and legs being visible, but the 

 neuration is more obliterated. The shape of the prothorax and 

 of the wings will distinguish this species from ovalis. The out- 

 line of the body is suggestive of a rather large Reduviid bug, 

 with broad wings, rather than of a neuropteroid insect. 



