GEN. HAP.] 



INSECTA. 



577 



mazonana, Scudder, 1882, Proc. Bost. Soc. 

 Nat. Hist., vol. 21, p. 391, Coal Meas. 



venusta, Lesque- 

 reux, 1860, (Blat- 

 tina venusta,) 

 Geo. Sur. Ark., 

 vol. 2, p. 314, Coal 



ENu M , Scud- 

 der, 1884, Mem. 

 Bost. Soc. Nat, Hist., vol. 3, p. 329. 

 [Ety. genos, race, kind ; entomon, insect.] 

 Wings large, elongated with coarse ve- 

 nation and abundant cross veins ; medi- 

 astinal vein very long, with numerous 

 branches to the costa ; other branches 

 very distant and stout ; the externo-me- 

 dian separated more widely than usual 

 from the scapular, especially in the 

 hind wing. Type G. validum. 

 validum, Scudder, 1884, Mem. Bost. Soc. 

 Nat. Hist., vol. 3, p. 329, Coal Meas. 



FIG. 1082. Genentomum validum. 



GENOPTERYX, Scudder, 1884, Mem. Bost. 

 Soc. Nat. Hist., vol. 3, p. 327. [Ety. 

 genos, kind, race ; pterux, a wing.] In- 

 terno-median vein with branches very 

 similiar to those of the externo-median 

 vein, the outermost in close proximity 

 to the innermost branches of the latter. 

 Type G. constricta. 



constricta, Scudder, 1884, Mem. Bost. Soc. 

 Nat. Hist., vol. 3, p. 327, Coal Meas. 



GERABLATTINA, Scudder, 1879, Mem. Bost. 

 Soc. Nat. Hist., vol. 3, p. 110. [Ety. 

 geras, old ; Blattina, a genus of insects.] 

 Mediastinal area comparatively long ; 

 scapular and externo-median area to- 

 gether occupy less than half the wing, 

 the branches of both superior ; interno- 

 median vein comparatively long. Type 

 G. balteata. 

 balteata, Scudder, 

 1879, Mem. Bost. 

 Soc. Nat. Hist., vol. 

 3, p. 110, and Perm, 

 or Up. Garb. Flora 

 Of Pa., p. 104, Up. FIG. 1083.-Gerablat- 

 Coal Meas. or Per- tina balteata. 

 mian. 



fascigera, Scudder, 1879, (Blattina fascig- 

 era,) Mem. Bost. Soc. Nat. Hist., vol. 

 3, p. 113, Coal Meas. 



GEREPHEMERA, Scudder, 1868, Lond. Geo. 

 Mag., vol. 5, p. 175. [Ety. geras, old ; 

 Ephemera, a genus of insects.] Founded 

 on the fragment of a tip of the wing. 

 Definition incomplete. Type G. 

 simplex. 



simplex, Scudder, 1868, Lond. Geo. Mag., 



vol. 5, p. 175, Upper Devonian. 

 GERAPOMPUS, Scudder, 1884, Mem. Bost. 

 Soc. Nat. Hist., vol. 3, p. 326. [Ety. 

 geras, old ; pompos, an escort.] Body 

 slender, the prothorax as long as broad ; 

 fore wings well rounded, the media- 

 stinal arcuate like *;he costa, with infre- 

 quent simple branches; scapular end- 

 ing near the tip. Type G. blattinoides. 



blatinoides, Scudder, 1884, Mem. Bost. 

 Soc. Nat. Hist., vol. 3, p. 326, Coal 

 Meas. 



extensus, Scudder, 1884, Mem. Bost. Soc. 



Nat. Hist., vol. 3, p. 326, Coal Meas. 

 GERARUS, Scudder, 1868, Mem. Bost. Soc. 

 Nat. Hist., vol.3, p. 344. [Ety. geraros, 

 of stately bearing.] Body slender, taper- 

 ing anteriorly ; wings slender ; mediasti- 

 nal vein variable ; branches of scapular 

 vein numerous, more or less longitudi- 

 nal, simple or forked, occupying much 

 more space than the branches of any 

 other vein. Type G. danse. 



danse, Scudder, 1868, (Miamia danse,) 

 Geo. Sur. 111., vol. 3, p. 566, Coal Meas. 



FIG. 1084. Gerarus dan 



mazonus, Scudder, 1884, Mem. Bost. 

 Soc. Nat. Hist., vol. 3, p. 344, Coal Meas. 



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



Hist., vol. 3, p. 344, Coal Meas. 

 GERONEURA, Matthew, 1888, Trans. Roy. 

 Soc. Can., p. 57. [Ety.geros, old ; neura, 

 a vein.] Anterior wing of the body 

 elliptical elongate, venation strongly 

 marked, scapular ridge conspicuous; 

 mediastinal vein close to the scapular, 

 but curves outward at the extremity ; 

 scapular vein and its branches cover a 

 triangular area terminating at the 

 apical end of the wing; main scapular 

 terminates near the end of the costal 

 edge; externo-median vein throws off 

 two branches, the first one stronger 

 than the main vein, and the second one 

 goes with a sinuosity toward the base 

 of the apical margin ; nerves regular 

 and simple. Type G. wilsoni. 



wilsoni, Matthew, 1888, Trans. Roy. Soc. 



Can., p. 57, Lower Devonian. 

 HA PLOPHLEBIUM, Scudder, 1867, Can. Nat. 

 and Geo., 2d ser., vol. 3, p. 202, and 

 Proc. Bost. Soc. Nat. Hist., vol. 11, p. 

 150. [Ety. haplos, simple ; phlebion, 

 a vein.] Wing with simple neuration 

 and intercostal spaces filled with mi- 

 nute reticulations without any cross 

 veins ; wing long and slender. 

 Type H. barnesi. 



