256 ORTHOPTEKA. 



to the speculum. The adventitious veins belong to the two types described, ant eh, 

 p. 212*. When the vence obliquce exist, they are obliquely longitudinal, straight, or 

 flexuous, sometimes flabellatef; the last one anastomoses with the base of the 

 diagonal vein. When the venae obliquae are atrophied, they are replaced by the two 

 vence transversa (Tab. XIII. figg. 23, 29, v), and only the arch forming the base of the 

 last oblique vein remains. This transformation is peculiar to the tribe Eneopterinse. 



In several genera of this section the elytra of the males are destitute of a tambourine, 

 i. e., formed as in the females. In a few types the tambourine is imperfectly developed, 

 and the neuration of the elytra is, in consequence, very irregular and reticulated J. It 

 may be added that some of the genera of Eneopterinse are completely winged, and 

 others are apterous, or have only rudimentary elytra, in both sexes. The males and 

 females, therefore, are usually very similar in this respect, whereas in most of the 

 (Ecanthinse the males are generally more fully winged than the females. 



The genera here noticed may be grouped by the development of the elytra : — 



a. Both sexes completely winged. 



b. The elytra of the males transformed, musical. Their tambourine having : 

 c. The true oblique veins well developed. (Tab. XIII. fig. 9, v.) 



d. longitudinally oblique, straight, and parallel. — Eneopterus ; Diatrypus. 

 dd. elongate longitudinal, flexuous. — Paroecanthus. 

 cc. The true oblique veins replaced by two transverse veins. (Tab. XIII. fig. 29, v.) — [Phyllo- 

 gryllus~\ ; Apithes ; Orocharis ; Orochirus. 

 bb. The elytra of the males not musical, similar to those of the females. — Euscirtus ; Aphonus ; 

 Stenaphonus ; Heterecous. 

 aa. Both sexes incompletely winged. 

 b. With abbreviated elytra. 



c. Males with tambourine. — [Agnothecous, Sss. (Oriental type).] 

 cc. Males without tambourine. — Euscirtus. 

 bb. Apterous. — [Paranaudus ; Parametrypus, Sss. (Oriental type).] 



Group ENEOPTEBITES, Sauss. 

 Eneopterites, Saussure, Melang. Orthopt. 6 e fasc. pp. 645, 649. 



ENEOPTERUS, Burm. 



Eneoptera, Burmeister, partim (1838); Saussure, Miss. Scient. Mex., Orthopt. p. 481. 



Eneopterus, Saussure, Melang. Orthopt. 6 e fasc. pp. 646, 671 (1871). 



Platydactylus, Brulle, Hist. Nat. des Ins. ix. p. 176 (1855) ; — Serville; — de Haan; — Brunner v. W. 



* For more detailed account of their origin, see Saussure, Melang. Orthopt. 6 e fasc. figg. lv., 1, 5, 6, 7, and 

 their explanation. f Comp. Saussure, loc. cit. fig. li., o. 



X Oriental genera, Nisitnts, Cardiodactylus. These types are important for the study of the homologies, 

 showing how the normal neuration is modified to form the tambourine. 



