AMERICAN PALEOZOIC INSECTS— JIANBLIESCH. 785 



(MYLACRID^) GURLEYI (Scudder). 



.'Ifi/hirrix (jiirlri/i ScrnDEH, Bull. U. S. Geol. Surv., No. ll!4, 1S95, p. 43, pi. i, 

 fi.tr. 5. 



Localilii. Mazon Creek, near Morris, JUinois. Pennsylvanian; 

 Kittanninti' '. ( Allej»"heny) stage. 



(MYLACRIDiE) RIGIDA (Scudder). 



Pr<niiijl(ici-i>i ri</i(]fi Scudder, Mem. Boston Soc, IV, 185)0, ]). 403, pi. xxxi, fijj. 6. 

 Pr(i)n!//<i<-ri!< ri</i(i' Sellards, Amer. Jour. Sci. (4i, XVIII, 1904, p. 221, fig. 36. 



L(ic(//i/t/. — Mazon Creek, near Morris, Illinois. Pennsylvanian; 

 Kittannino- ( (Allegheny) stage. 

 JfoIotijjk'.^CRt. No. 3S045, U.S.N.M. 



(MYLACRID^E) AMPLA ( Scudder). 



Pdroiiii/ldcri.t itmpht .Scuddkk, Mem. r>oston Sx'., IV, 1890, ^. 408, pi. xxxi, fig. 7; 

 Bull. t;. S. (xeol. Surv., No. 124, 1895, p. 51, pi. iii, fig. 4. 



Locality. — Mazon Creek, near Morris, Illinois. Pennsylvanian; 

 Kittanning i (Allegheny) stage. 



Ilolotyjh'.-Cni. No. 88044, F.S.N.M. 



Family DICTYOMYLACRID.E. new family. 



In this groLi}) I unite several forms from the European and American 

 Car])oniferous, which, in the form of the costal area, recall the archi- 

 mylacrids on the one hand and the mylacridson the other. The costal 

 area is here of almost triangular form, while most of the branches 

 arise successively f I'om the subcosta. The branches of the radius are 

 directed obli(|uely forward; those of the media, on the contrary, slope 

 backAvard. The cubitus occupies only a limited space, and the anal 

 area is marked oti' by a curved suture, in which part of the anal veins 

 end. The longitudinal veins are connected ))v distinct, remote cross 

 veins. In the European forms the prothorax is very broad, trans- 

 versely elliptical, and is characterized by ribs which run off radiall}^ to 

 the periphery. 



DICTYOMYLACRIS Brongniart. 



Front wing somewhat more than twice as long as broad, subcordate, 

 with strongly arched anterior margni, costal area occupying from 

 four-sevenths to two-thirds the length of the wing, with from 5 to 7 

 veins arising successivelv from the subcosta and several feebly 

 branched ones proceeding from the base. 



