LOPHASPIS. — TANUSIA. 449 



Cerci recti, crassi, cylindrici, apice brevissime intus sinuati, minute unguiculati. Lamina infra-genitalis 

 basi carinata, eompressa, cercos superans, plusquam dimidia parte apicali angustissima, parallela, apice 

 subtus sulcata, truncata, stylis teretibus, longiuseulis instructa. Elytrorum tympana bina speculo magno 

 membranaceo instructa. 



$ . Long. corp. 40 ; pronot. 8-5 ; elytr. 45, lat. 19 ; femor. post. 27 ; ovipos. 18 millim. 



J. Long. corp. 43'5; pronot. 8; elytr. 38, lat. 16; femor. post. 24 millim. 



Figure. — Pig. 24, the male insect, partim. 



Hab. Panama, Volcan de Chiriqui 2000-3000 feet (Champion), Chiriqui (coll. 

 Brunner). 



In its general facies this insect somewhat resembles the genus Bysmorpha, of the 

 Phaneropterinse. 



Group PTEROCHROZITES. 



Pterochrozce, Brunner v. W. Monogr. der Pseudophyll. p. 245. 



The species of this group are all extraordinarily mimetic. Their elytra are flat, 

 folding together perpendicularly in repose, and coloured exactly like the leaves of 

 trees or bushes. Some are green, imitating living leaves ; others have their elytra 

 tinted with yellow or reddish, like leaves which are beginning to take the autumn tints ; 

 others, again, are brown, like dead leaves. In these latter the mimetic resemblance is 

 carried still further, the elytra being often marked with brown dots and pale plagae, 

 just like leaves in various stages of decay, so that no two specimens are exactly alike. 

 Moreover, in these sham dead leaves there are often transparent spots, imitating the 

 holes made by insects : in the males of some genera (Mimetica and Typophyllum) the 

 margins of the elytra are crenulated and notched, as if gnawed by caterpillars. Some 

 of these apparent accidents are characteristic of the species, especially the crenulation 

 of the margins of the elytra and the transparent spots. 



The most important of such spots are placed beyond the middle of the discoidal 

 field, and, although somewhat variable, they constitute specific markings ; others are 

 sometimes spread over the elytra, in quite irregular positions, and must be regarded as 

 purely mimetic, without fixity, and not specific. 



In the green forms the elytra are generally entire, imitating living leaves, neither 

 altered in their colour nor attacked by insects. 



The identification of the species can scarcely be made with certainty without accurate 

 figures of the elytra. 



TANUSIA, StfiL 

 Tanusia, Stal, Recens. Orthopt. 2, p. 57 (1874) ; Brunner v. W. Monogr. der Pseudophyll. p. 247. 



The two species here described differ from the typical Tanusice in having the hind 

 wings less transparent, almost dull ochraceous, and destitute of the apical ocellus ; but 

 it is not advisable to separate them generically. 



biol. cente.-amer., Orthopt., December 1898. 3 Mm 



