PRO. — XEN.] 



INSECTA. 



581 



Pbopteticus, Scudder, 1884, Mem. Bost. Soc. 

 Nat. Hist., vol. 3, p. 334. [Ety. proi, 

 early ; ptelikos, winged.] Scapular vein 

 widely separated from the mediastinal, 

 arcuate, main branch arising near the 

 base of the wing, parting widely from 

 the main stem. Type P. infernus. 

 infernus, Scudder, 1884, Mem. Bost. Soc. 

 Nat. Hist., vol. 3, p. 334, Coal Meas. 



Termes, Linnaeus, 1748, Systema Naturae, 

 p. 610. Not a Palaeozoic genus. 

 contwuz, see Didymophleps contusa. 



Fig. 1095.— Treptichnus bifurcus. The trails are 

 larger than shown by the figure. 



TiTANOPnAMA, Brongniart, as recognized 

 by Scudder. Wing very large, moder- 

 ately slender ; neuration moderately 



abundant; scapular vein beginning to 

 branch in the middle of the basal half 

 of the wing. 



jucunda, Scudder, 1884, Proc. Amer. Acad., 

 vol. 20, p. 169, Coal Meas. 

 Treptichnus, n. gen. [Ety. treptos, to be 

 turned about ; ichnos, track.] A zigzag, 

 half-cylindrical, continuous trail, 

 forked at each angle, and running in 

 any direction ; each line is prolonged 

 in the direction in which the animal 

 moved, at the angle, so as to form a 

 short fork or projection. Supposed to 

 have been made by the larva or pupa 

 of some Pakeopterous insect. See re- 

 marks under Haplotichnus. Type T. 

 bifurcus. 



bifurcus, n. sp. A zigzag, half-cylindrical, 

 continuous trail, quite evenly depressed, 

 and forked at each angle ; the bifurca- 

 tion takes place in the direction in 

 which the animal moved, but generally 

 is less sunken than the trail, and 

 sometimes shows simply a dot discon- 

 nected with the angle. Collected in 

 the upper part of the Kaskaskia Group 

 at the Whetstone quarries in Orange 

 County, Indiana. 

 Xenoneura, Scudder, 1867, Can. Nat. and 

 Geo., 2d ser., vol. 3, p. 202. [Ety. xenos, 

 new, strange ; neura, a vein.] Mediasti- 

 nal and scapular veins as in Palaeop- 

 terina; externo-median vein amalga- 

 mated at base with the 

 scapular, branching be- 

 yond the middle, interno- 

 median divided at base in 

 two branches. Type X. 

 antiquorum. 



antiquorum, Scudder, 1867, 

 Can. Nat. and Geol., 2d ser., vol. 3, p. 

 202, and Acad. Geol., p. 525, Upper 

 Devonian. 



38 



