Vicinity of Mason Creek, Illinois. 357 



strongly curved furrow. Costa marginal. Sector rising in the 

 middle of the wing, giving off but a few branches, directed 

 backward toward the apical margin. The media free, sending 

 some branches obliquely backward, the last of which reaches 

 the posterior margin. Cubitus of a moderate development, 

 splitting into numerous irregular branches which form, by the 

 aid of cross veins, an irregular network and often take the 

 character of intercalary veins. 



Epideigma, new genus. 

 JEpideigma elegans, new species. Fig. 34. 



Prothorax somewhat longer than broad, of a nearly semi- 

 elliptical shape. Head comparatively small; not quite con- 

 cealed under the pronotum and bearing large, strongly vaulted, 

 lateral eyes. Antennae long and slender. Anterior wings 

 28 mm long with a somewhat waved costal margin and with a 

 broad costal area, filled by oblique branches of the subcosta 

 and of the radius. Radius reaching nearly to the tip. Sec- 

 tor rising at about one-third of the length, diverging com- 

 paratively far from the radius and giving rise to only 2 

 branches. Media independent of the radius and cubitus, 

 slightly waved and traversing the middle of the wing. Of its 

 3 branches, which extend obliquely backward, the first is 

 forked and has, like the second, a few short apical veinlets 

 with the aspect of intercalary veins. The cubitus is cleft near 

 the base into 2 main branches, both splitting into numerous 

 twigs, running obliquely backward and taking part in the 

 formation of a network. All main interstices are filled by a 

 more or less' regular polygonal network. The very short anal 

 area hardly reaches one-fifth of the length of the wing and is 

 limited by a sharply curved furrow. 



Holotype in Peabody Museum, Yale University, Cat. No. 45. 



Family CHELIPHLEBID^S Handlirsch. 



By the discovery of a new species this family loses in some 

 degree its provisional character and can with more certainty be 

 added to the Protoblattoidea. It seems to be most nearly 

 related to the Eucaenidse, having like those broad and short 

 front wings with a broad costal area, the veins of which are 

 not arranged in regular combdike manner, but are irregular and 

 ramified. The subcosta unites with the costa; the radius 

 remains simple and its sector sends forth but few branches, 

 directed obliquely backward. The media free and splitting 

 into only few branches. The cubitus more richly ramified. 

 Pronotum disciform and comparatively small, equal in length 

 and breadth. 



Am. Jour. Sci.— Fourth Series, Vol. XXXI, No. 185.— May, 1911. 

 25 



