576 



INSECTA. 



[DID ETO. 



fifths of the upper wing, and perhaps 

 more of the lower ; remainder of wing 

 occupied by the longitudinally divari- 

 cating branches of the next two veins ; 

 anal area in upper wing distinctly set 

 off at the basal portion of the 

 wing. Type C. lapidea. 



lapidea, Scudder, 1868, Geo. Sur. 



111., vol. 3, p. 567, Coal Meas. 

 DIDYMOPHLEPS, Scudder, 1878, Proc. ^3^ 

 Bost. Soc. Nat. Hist., vol. 19, p. ^| 

 300. [Ety. didymos, double ; ^ 

 phleps, vein.] All the veins and ""^ 

 branches above the interno- 

 median longitudinal and nearly 

 parallel; nearly all the lower 

 half of the wing being occupied 

 by the oblique branches of the interno- 

 median vein. Type D. contusa. 



contusa, Scudder, 1878, (Termescontusus,) 

 Bost. Soc. Nat. Hist., vol. 19, p. 300, and 

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

 330, Coal Meas. 



DIECONEURA, Scudder, 1884, Mem. Bost. Soc. 

 Nat. Hist., vol. 3, p. 336. [Ety. dieko, 

 to extend through; neuron, a vein.] 

 Externo-median vein simple ; interno- 

 median vein important, arcuate, ex- 

 tending far toward the extremity of the 

 lower margin. Type D. rigida. 



arcuata, Scudder, 1884, Mem. Bost. Soc. 

 Nat. Hist., vol. 3, p. 336, Coal Meas. 



rigida, Scudder, 1884, Mem. Bost. Soc. 



Nat. Hist., vol. 3, p. 336, Coal Meas. 

 DYSCRITUS, Scudder, 1868, Lond. Geo. Mag., 

 vol. 5, p. 176. [Ety. dyscritos, hard to 

 determine.] Founded on a fragment 

 of the middle part of a wing with- 

 out proper definition. Type D. ve- 

 tustus. 



vetustus, Scudder, 1868, Lond. Geo. Mag., 



vol. 5, p. 176, Devonian. 

 ENC*:NUS, Scudder, 1884, Mem. Bost. Soc. 

 Nat. Hist., vol. 3, p. 325. [Ety. en, 

 very ; kainos, new, strange.] Body 

 stout, thoracic segments twice as broad 

 as long; abdomen ovate; fore wings 

 with the mediastinal vein straight, ter- 

 minating before the apical third of the 

 wing with numerous straight branches ; 

 scapular with similar branches ending 

 half way between the mediastinal 

 and the tip ; externo-median impor- 

 tant with distant branches. Type E. 

 ovalis. 



ovalis, Scudder, 1884, Mem. Bost. Soc. 

 Nat. Hist, vol. 3, p. 325, Coal Meas. 



FIG. 1077. Ephemerites affin 



EPHEMERITES, Scudder, 1868, Geo. Sur. 

 111., vol. 3, p. 571. [Ety. Ephemera, a 



living genus.] The genus was not de~ 

 fined. It is probably a neuropteroid 

 Palseodictyoptera. Type E. simplex, 

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

 3, p. 572, Coal Meas. 



FIG. 1078. Ephemerites gigas. 



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



3, p. 571, Coal Meas. 

 primordialis, Scudder, 1878, Proc. Bost. 



Soc. Nat. Hist., vol. 19, p. 248, Coal 



Meas. 



FIG. 1079. Ephemerites simplex. 



simplex, Scudder, 1868, Geo. Sur. 111., 



vol. 3, p. 571, Coal Meae. 

 ETOBLATTINA, Scudder, 1882, Proc. Bost. 

 Soc. Nat. Hist., vol. 21, p. 391. [Ety. 

 etos, true; Blattina, a genus.] Media- 

 stinal area comparatively short; scapu- 

 lar not reaching tip of wing and with 

 the externo-median, which is compara- 

 tively large, occupying less than half 

 the wing; interne-median vein compar- 

 atively long. Type E. mazonana. 



FIG. 1080. Etoblattina primaeva. From 

 Saarbruck in Europe for comparison. 



lesquereuxi, Scudder,, 1879, Mem. Bost. 

 Soc. Nat. Hist., vol. 3, p. 67, Coal 

 Meas. 



