E. H. Sellarcls — Types of Permian Insects. 157 



Atavci ovata gen. et sp. n. Text figure 3. 



The genus Atava is based upon a detached hind wing which 

 differs so widely in venation as well as in size from other known 

 types of this family as to represent without doubt a distinct 

 genus. The radial sector is detached from the radius. It is 

 three branched and fills the apex of the wing. Media is two 

 branched. -Cubitus is a straight deeply impressed vein reaching 

 from the base to the inner border. The anal area is wanting. 



Length of hind win^, 8 mm ; width at termination of the anal 

 area, 3 mm . Type, ^0.^372. 



Lioraopteridm, family new. 



The family Liomopteridse includes a group of robust 

 insects. The subcostal vein in this family is straight or nearly 

 so, never arched, and gives off numerous oblique strong 

 branches resembling in this respect many of the modern mantid 

 species. The radius gives off oblique branches beyond the 

 termination of the subcosta. The radial sector is several times 

 branched. The media divides early. Cu 2 is simple. Cn, and 

 the media are variable in their branching. 



The hind wing is shorter and broader than the front. The 

 anal area is imperfectly known. It is, however, marked off by 

 a deeplv impressed cubitus, and is doubtless expanded and 

 folded. 



The legs are preserved, in part, on the type specimen and are 

 seen to be relatively long and stout. The thorax is also partly 

 preserved and is somewhat elongated. 



Liomopterum gen. n. 



The front wings of the species of this genus are elongate ; 

 the costal border slightly arched. The subcosta lies in a shallow 

 furrow and ends on the costa beyond the middle of the wing. 

 The subcostal branches are numerous, oblique and mostly 

 simple. The radius lies on a fold and reaches to the tip of the 

 wing. Beyond the termination of the subcosta, numerous 

 oblique simple veins pass from the radius to the border. The 

 radial sector is given off at or near the termination of the basal 

 third of the wing, and is three branched. The media divides 

 early, one or both divisions being subdivided. The cubitus is 

 uniformly arched at the base. Ciij is simple to three-branched ; 

 Cu 2 is simple. 



The hind wing is thinner than the front. It is much 

 expanded and is folded, the fold being marked off by a strong 

 straight line. The radius of the hind wing is four branched, 

 as is also the media. 



