ARTHROPOD A— INSECTA. 



429 



ures of Mazon Creek, 111., and Paolia vetusta Smith (Fig, 1729), 

 characterized by an abundance of cross-veins, from the Mans- 

 field of Indiana. 



Order MIXOTERMITOIDEA Handlirsch. 



Wings with broadly rounded apical border, with neuration 

 closely approaching that of the preceding type ; branches of M few, 

 they, the cubitus and the anal veins extending obliquely to the 

 lower margin ; anal area feebly developed ; Sc reduced ; R simple ; 

 Rs feebly branched ; cross-veins straight and numerous. 



Only one European and one American species are known, the 

 latter being Geroneura wilsoni Matthew of the Little River Group 

 of St. John, N. B. 



Order PROTORTHOPTERA Handlirsch. 



Wings more highly specialized than in preceding types; folded 

 over the abdomen when at rest; front wings with more compli- 

 cated venation than in Pal^odictyoptera, the veins no longer ex- 

 tending in regular curves to the inner margin. Hind wings similar 

 to the front wings, but with larger anal area, marked off by a fold. 

 Body more or less strongly built, prothorax large, often much 

 elongated; head large, mouth parts strong, fitted for chewing; 

 antennae long, slender; legs similar in form, fitted for running; 



Fig. 1730. Spaniode7'a avibulans Handl., Mazon Creek, 111. Carbonic ; crushed 

 specimen, and front and hind wings ; C, costa ; Sc^ subcosta ; R^ radius ; Rs, radial 

 sector ; M, media ; Cu, cubitus; A, anal area. (After Handlirsch.) 



