LIT. — PAO.] 



INSECTA. 



579 



hartti, Scudder, 1867, Can. Nat. and 

 Geol., 2d ser., vol. 3, p. 202, and Acad. 

 Geol., p. 525, Upper Devonian. 

 Lithomylaceis, Scudder, 1879. Mem. Bost. 

 Soc. Nat. Hist., vol. 3, p. 48. [Ety. 

 lithos, stone ; Mylakris, a kind of roach.] 

 Mediastinal and scapular areas together 

 occupying more than half the wing; 

 externo-median area small, compressed, 

 scarcely expanding apically. Type L. 

 angustnm. 



angustum, Scud- 

 der, 1879, Mem. 

 Bost. Soc. Nat. 

 Hist, vol. 3, p. 

 48, Coal Meas. 

 Fig. 1089. — Lithomylacris p i 1 1 s t onianuni, 

 angustum. Scudder, 1879, 



Mem. Bost. Soc. Nat. Hist., vol. 3, p. 50, 

 Coal Meas. 

 simplex, Scudder, 1879, Mem. Bost. Soc. 

 Nat. Hist., vol. 3, p. 51, Coal Meas. 

 Megathentomum, Scudder, 1868, Geo. Sur. 

 111., vol. 3, p. 570. [Ety. megathos, large- 

 ness; entomon, an insect.] Wings of 

 great size, remarkably broad and 

 rounded; veins distant; simple, infre- 

 quent divarications, and cross neura- 

 tion of delicate, irregular veinlets ; 

 the wing is also dotted with larger 

 and smaller spots. Type M. pustu- 

 latum. 



Fig. 1090.— Megathentomum pustulatum. 



pustulatum, Scudder, 1868, Geo. Sur. 111., 

 vol. 3, p. 570, Coal Meas. 

 Miamia, Dana, 1864, Am. Jour. Sci. and 

 Arts, 2d ser., vol. 37, p. 34. [Ety. proper 

 name.] Scapular vein close to the me- 

 diastinal ; straight, main branch arising 

 near the middle of the wing, and no- 

 where distant from the main stem. 

 Type M. bronsoni. 



bronsoni, Dana, 1864, Am. Jour. Sci. and 

 Arts, 2d ser., vol. 37, p. 34, Coal Meas. 



danse, see Gerarus danse. 

 Mylacbis, Scudder, 1868, Geo. Sur. 111., vol. 

 3, p. 568. [Ety. Mylakris, a kind of 

 cockroach.] Wings broad, mediastinal 



. and scapular areas together occupying 



Fig. 1092.— Mylacris 

 a n thracophilum 

 Pronotal shield. 



less than half the wing; scapular area 

 larger than the mediastinal. Type M. 

 anthracophilum. 



a n t h r a c ophilum, 

 Scudder, 1868, 

 Geo. Sur. 111., vol. 

 3, p. 568, Coal 

 Meas. 



antiquum, Scudder, 

 1884, Mem. Bost. 

 Soc. Nat. Hist., 

 vol. 3, p. 300, 

 Coal Meas. 



bretonense, Scud- 

 der, 1874, (Blat- 

 tina bretonensis,) 

 Can. Nat., vol. 7, 

 p. 271, Coal Meas. 



carbonum, Scudder, 

 1884, Mem. Bost. 

 Soc. Nat. Hist., Fig. 1091.— Mylacris an- 

 vol. 3, p. 304, thracophilum. 



Coal Meas. 



heeri, Scudder, 1874, (Blattina heeri,) 

 Can. Nat., vol. 7, p. 272, Coal Meas. 

 /-. sssv lucifugum) Scudder, 



/ " -\ 1884, Mem. Bost. Soc. 



Nat. Hist., vol. 3, p. 

 301, Coal Meas. 

 mansrieldi, Scudder, 

 1880, Mem. Bost. Soc. 

 Nat. Hist., vol. 3, p. 

 47, Coal Meas. 



ovale, Scudder, 1884, Mem. Bost. Soc. Nat. 

 Hist., vol. 3, p. 308, Coal Meas. 



pennsylvanicum, Scudder, 1880, Mem. 

 Bost. Soc. Nat. Hist., vol. 3, p. 44, Coal 

 Meas. 



priscovolans, Scudder, 1884, Mem. Bost. 

 Soc. Nat. Hist., vol. 3, p. 307, Coal Meas. 

 Necymylaceis, Scudder, 1880, Mem. Bost. 

 Soc. Nat. Hist., vol. 3, p. 53. [Ety. ne- 

 kus, dead ; Mylakris, a roach.] Some of 

 the apical branches of the mediastinal 

 vein arise beyond the base of the wing, 

 and scarcely partake in the radiate ar- 

 rangement of the others. Type N. la- 

 coanum. 



heros, Scudder, 1880, Mem. Bost. Soc. 

 Nat. Hist., vol. 3, p. 54, Coal Meas. 



lacoanum, 1880, Mem. Bost. Soc. Nat. 

 Hist., vol. 3, p. 53, Coal Meas. 

 Obyctoblattina, Scudder, 1885, Proc. Acad. 

 Nat. Sci. Phil., p. 37. [Ety. oruktos, 

 quarried ; Blattina, a genus.] Principal 

 veins widely separated at base ; scapular 

 area surpassing apex, and with externo- 

 median occupying more than half the 

 wing, the branches of latter inferior; 

 interno-median vein comparatively 

 short. Type O. occidua. 



occidua, Scudder, 1885, Proc. Acad. Nat. 

 Sci. Phil., p. 37, Coal Meas. 

 Paolia, Smith, 1871, Am. Jour. Sci. and 

 Arts, 3d ser., vol. 1, p. 44. [Ety. proper 

 name.] Wings long, slender, branches 

 of veins dichotomizing strongly, and 

 running in a longitudinal direction, so 

 that the externo-median branches oc- 



