510 HEMIPTEROEOGICAE GLEANINGS 



Tettigonia vs. Tettigoniella. 



Genus Tettigonia (Hemiptera) was founded by Geffroy in 

 1762 in his Hist. Abreg. des Iasects, vol. i, page 429, where he 

 spells it Tetigonia. Spelled with two t's it is preoccupied by 

 the Orthopterous genus Tettigonia of Linneus but Kirkaldy 

 claims that the omission of one of the t's makes it valid by the 

 rules of the International Code. Distant, however, has pointed 

 out (Fauna of British India, Rhyngota vol. 4, pags 201, 1908,) 

 that this spelling was merely a typographical error as Geoffroy 

 refers to Reaumur (Memoirs, vol. 5, page 150, 1740,) where it 

 is spelled with two t's and made to include practically the 

 same insects as does Geffroy's genus, and in this I believe 

 Distant is right. This genus was recognized by Latreille who 

 includes Cicada viridis Linn, which should probably be taken 

 as its type. Jacobi was first to recognize the necessity of 

 renaming the genus and in 1903 (Zool. Jahresb. xix, p. 778,) 

 proposes the name Tettigoniella, mentioning viridis of Linneus 

 which Distant names as the type. Fabricius with his predilec- 

 tion for mixing up the Linnean genera calls this genus Cicada 

 and the Cicadidae of the present day he calls Tettigonia. 



The following synonomy may make this more clear: 



Tettigoniella Jacoby, 1903; Distant, 1908; Van Du- 



zee, 1909. 

 Tettigonia Reaumur, 1740, (not of Linneus); Geffroy, 



1762 (misspelled Tetigonia) ; Latreille, 1802 ; Stal 



1869; Oshanin, 1906. 



Cicada Fabricius, 1775 etc; Zetterstedt, 1828. 

 Tetigonia Kirkaldy, 1900. 



Xestocephalus Agassizi n. sp. 



Closely allied to tessellatus but larger and more strongly marked. Pale 

 testaceous irrorated and varied with brown. Vertex and apex of the head 

 dark brown; median line, an oblong apical spot, a line about each lateral 

 compartment of the vertex which forms a large square produced toward the 

 apex and enclosing an ocellus-like spot, an oblique line on each side below 

 the apex, and a spot on each ocellus, whitish. Face brown; a few points on 

 the base of the front and the arcs obscurely paler; margins of the elypeus 

 and the antenna] pits piceous. Pronotum transversely wrinkled, evenly 

 mottled on the disk; anterior and lateral margins shading darker and 

 marked with about five larger whitish spots; lateral edges pale. Scutellum 

 whitish at apex; piceous-brown on the basal field where there is a broad 

 pale ray either side of the middle which approach anteriorly. Elytra pale 

 testaceous varied with brown which becomes piceous in places; nervures 



