E. II Sellards — Types of Permian Insects. 151 



Art. IX. — Types of Permian Insects ; by E. H. Sellards. 



[ Continued from vol. xxiii, p. 355, May, 1907.] 

 Part III. — Megasecoptera, Oryctoblattinid^e and Prot- 



ORTHOPTERA. 



The terms Dromeus, Scopus and Therates, proposed for 

 genera of ephemerids in Part II of this paper, have been found 

 to be preoccupied. As substitutes I suggest for Dromeus 

 Sellards ( non Reiche ), Misthodotes ; for Scopus Sellards ( non 

 Megerle), Mecus ; for Therates Sellards (non Latrielle), Esca. 

 The term Rekter should read Recter ; while Twpus (Pt. I, 

 p. 249 ) should read Typus. For these corrections I am 

 indebted to Mr. Leonhard Stejneger of the National Museum. 



Megasecoptera. 



The Megasecoptera have four slender, equally developed 

 wings, which are broadest at the middle and narrowed at the 

 base. The anal area of the wing is notably reduced. Cross 

 veins are not numerous. The abdomen is long, and is termin- 

 ated by streamers. 



The group is abundantly and typically developed in the 

 Commentry Coal Measure deposits of France,* and is sparingly 

 represented in some other European, and in the American 

 Coal Measure deposits.! The Megasecoptera have been known 

 heretofore from the Carboniferous only. Their extension 

 into the Permian is indicated by the genus herein described. 



Opter Urongniartii gen. et sp. n. Text-figure 7. 



The genus Opter is based upon a single detached wing, the 

 apex and a part of the inner border of which are wanting. 

 The wing is thin, slender, and very much narrowed at the base. 

 The costal border is straight. The subcosta is a thin vein run- 

 ning parallel to the radius. The media is united with the 

 radius in the basal one-fourth of the wing. At its point of 

 separation from the radius the media has a characteristic 

 downward curve ^almost touching the cubitus. The cubitus 

 is two-branched. Cross veins occur sparingly in the w T ing. 



Length of wing estimated, 13 to 15 mm ; width, 2-J to 3 mm . 



Type specimen No. 1286. 



* Charles Brongniart, Tnsectes fossiles des Temps primaires, pp. 280 et 

 seq., 1893. 

 f Anton Handlirsch, Die Fossilen Insekten, p. 312 et seq., 1906. 



