Vicinity of Mason Creek, Illinois. 



363 



Handlirsch, as is shown in fig. 44. What I previously had 

 called media evidently is the sector and the complex of veins 

 formerly regarded as cubitus contains also the media. 

 Holotype in the U. S. National Museum. 



Fig. 44. 



Fig. 44. Euccenus rotundatus (new reconstruction). 

 Family ANTHRACOTHKEMMIDiE Handlirsch. 



Three of the fossils in the Yale collection seem to be of a 

 near relationship with Anthracothremma Scudder. A com- 

 mon characteristic of these forms is a greatly reduced and 

 shortened anal area, a shortened subcosta and the tendency of 

 all veins to stretch in the direction of the longitudinal axis of 

 the wings. In all these species the media is of a comparatively 

 small extent. 



Pericavyphe, new genus. 

 Pericalyphe longa, new species. Fig. 45. 



A slender insect with anterior wings 50 ram long which are 

 at least four times longer than broad. The subcosta is strongly 

 reduced and unites with the radius. Costal area narrow, 

 traversed by short, stiff veinlets. The simple radius not quite 

 attaining the apex ; its sector rising beyond the first third of 

 the length and sending off 9 simple and very regular parallel 

 branches, directed toward the apical border. The quite inde- 

 pendent medial vein remains undivided. The cubitus, running 

 in a large curve toward the end of the hind margin, sends off 

 6 long branches, some of which are ramified. All of these 

 take the direction of the sector branches and of the media. 

 Only one or two short branches near the base run obliquely to 

 the posterior margin. The anal area, limited by a curved 

 furrow, reaches but one-fifth of the wing length. Very indis- 

 tinct cross veins probably fill all the interstices. 



In the posterior wing the subcosta is produced almost to the 

 tip but likewise unites with the radius. 



The disproportionately small pronotum forms a semicircular 

 disk of scarcely 5 mm in length. Meso- and metathorax are of a 



