MORCxAN HEBARD 339 



characters here given, are properly referable to othei' distinct 

 though closely related genera. 



Genotype. — T[schnoptera] morio Biirnicister, selected by Kirby 

 in 1906.2 



Generic Description. — Head elongate; ocelli distinct with flat 

 surfaces of ocellar areas forming a rather sharp angle with the 

 interocellar space.-* Pronotuni weaklj^ convex, becoming strongly 

 so narrowly laterad; disk in males with two distinct sulcations 

 mesad which converge caudad, in females showing reduced teg- 

 mina and wings these sulci are usually obsolete ; lateral margins of 

 pronotum fully as chitinous as the disk, the immediate margins 

 cingulate ; caudal nmrgin of pronotum very weakly and broadly 

 convex. 4 Tegmina with discoidal sectors (these including the 

 median and ulnar veins and their In-anches, of which the branches 

 of the ulnar vein are the more numerous) weakly radiating so that 

 the branches near the sutural margin are weakly oblique to that 

 margin. Wings with area between discoidal vein and costal 

 margin narrow throughout; mediastine vein extending more than 

 half the distance to the apex of the wing, from which vein spring 

 a number of the costal veins; none of the costal veins enlarged 

 distad; discoidal vein percurrent to apex of wing, undivided, 

 with a number of distinct, well spaced, nearly perpendicular 

 veinlets connecting with the median vein; ulnar vein weakly 

 curved with a number (3 to 7) of proximal incomplete rami and 

 a number (4 to 6) of moderately arcuate distal rami extending to 

 the distal margin of the wing; intercalated triangle small and 

 inconspicuous.^ Males with median segment not specialized, 

 but with sixth and seventh dorsal abdominal segments greatly 

 specialized. Sixth dorsal segment emarginate mesad to near its 



■" Synon. Cat. Orth., I, p. 80. 



3 As in other genera of the group, the ocellar area becomes less strongly 

 defined as tegminal and wing reduction takes place. Where such reduction is 

 decided the well defined ocelli are usually likewise reduced, represented, by 

 mere ocellar spots. 



* As in many genera of the Blattidae, the caudal margin of the pronotum is 

 seen to become more truncate and more nearly transverse in mateiial showing 

 decided tegminal and wing reduction. 



^ None of the species of Isc.hnoptern considered in the i)resent paper .show 

 very great tegminal and wing reduction. That this occurs in the genus is 

 shown by the female sex of both /. vilis and /. ileroyelliformi.s. 



TRANS. AM. ENT. SOC, XLII. 



