ANCHIPTOLIS.— IDIAKTHEON. 42S 



punctate Femora anteriora 4-5-spinosa. Lobi geniculares internae femorum posticorum dentiformes, 



haud spinosis. Femora omnia ad apicem superne vitta lutea ornata. Tibiae anticae annulo luteo. Spmse 



femorum concolores vel luteae, apice nigro. 

 d" . Lamina supra-analis late trigonalis, sulcata. Cerci crassissimi, brevissimi, apice obtuso. Lamina infra- 



genitalis stylis gracillimis, apice attenuatis, intus sulcatis instructa. 

 Long. corp. 37 ; pronot. 9 ; elytr. 41 ; femor. post. 26 millim. 



Hah. Guatemala, Panzos in Vera Paz (Conradt). 



[5. Anchiptolis peruviana, sp. n. (Tab. XX. fig. 12.) 



Fulvo-testacea vel rufescens, tota unicolor. Yerticis rostrum angustum, basi tuberculos ocellares 2 prominulos 

 praebens. Pronotum ubique verruculoso-tuberculatum, in sulco postico macula minuta nigra ; margine 

 antico frequenter tuberculo minuto nigro notato ; margine postico arcuato. Elytra apice acuminata, 

 venis concoloribus. Campus tympanalis elytri $ brevissimus ; margine postico haud dilatato, scilicet 

 marginem posticum elytri haud superante. Alee hyalino-fuscescentes. Femora postica lobo geniculari 

 interno spina minuta armato. Tibiae intermediae supra spinulis 2. 



c? . Cerci teretes, apice incurvo, in spinam longiuscnlam excurrentes. Lamina infra-genitalis profunde incisa, 

 apice valde attenuata, extus sinuata, in lobos 2 angustos producta ; stylis longis, apicem versus leviter 

 incrassatis instructa. 



c? . Long. corp. 32 ; pronot. 7 ; elytr. 34 : femor. post. 21 millim. 



Figuke : — Fig. 12, a cercus of the male (terminating in the form of a spine). 

 Hab. Peru (Mus. Genavense). 



A species readily recognizable by the long spines of the cerci.] 



IDTARTHRON, Brunn. 

 Idiarthron, Brunn. v. W. Monogr. der Pseudophylliden, p. 172. 



This genus is chiefly confined to Central America, but extends southwards to the 

 Amazon valley. All the species are very similar, and they can be separated only by 

 the structure of the anal pieces. The colour is always fulvous-grey, but it is most 

 likely somewhat olivaceous in life ; the spines of the femora are usually black, but iD 

 one species those of the anterior and intermediate pairs are paler in colour. The form 

 of the supra-anal plate is often difficult to make out, the anal pieces being partly or 

 entirely concealed by the cerci. 



The true limits of two of the species are not clear to us, on account of the singular 

 variation in the shape of the anal pieces of the males. 



I. incurvum is a very distinct species, characterized by the curved process of the 

 supra-anal plate in both sexes and by the simple male cerci. 



i". subqiiadratum seems also distinct by the short, quadrate supra-anal plate in both 

 sexes, its pale colour and subpubescent surface (rarely rounded, corneous, rufous, and 

 polished), and by the simple male cerci, these latter being conical at the tip and without 

 a black apex. 



/. furcatum is not so well defined, owing to the male cerci not being always distinctly 

 furcated. Sometimes their superior branch becomes short or is reduced to a rounded 



