THYSDRUS.— LISTEOSCELIS. 403 



Hab. Guatemala, San Geronimo {Champion). — Guiana, Cayenne (Prudhomme). 

 The short ovipositor distinguishes this species from all others of the genus. 



[Group LISTROSCELITES. 

 Listroscelini, Redtenbacher, Monogr. der Conocephaliden, p. 217. 



LISTROSCELIS, Serv. 



Listroscelis, Serville, Rev. Meth. p. 64 (1831); Hist. Nat. des Ins. Orthopt. p. 396 (1839); 



Brulle, Hist. Nat. des Ins. ix. p. 160 (1835) ; Burmeister, Handb. der Ent. ii. p. 715 (1839) ; 



Redtenbacher, Monogr. der Conoceph. p. 229. 

 Cerberodon, Perty, Del. Anim. Art. Bras. p. 119 (1830) ; St&l, Recens. Orthopt. 2, p. 101 (1874). 

 Monocerophora, Walker, Cat. Derm. Salt. ii. p. 157 (1869). 

 Xiphidium, de Haan, Bijdr. tot Kenn. Orthopt. p. 190 (1842) (nee Serv.). 



l. Listroscelis arachnoides, Redt. 



Listroscelis arachnoides, Redt. Monogr. der Conoceph. p. 232. 

 Hab. Colombia.] 



Tribus PSEUDOPHYLLINAE * 

 Pseudophyllidce, Brunner v. Wattenwyl. 



Tarsi depressi, articulis primo et secundo utrinque dilatatis et longitudinaliter sulcatis. Caput rotundatum vel 

 conicum. Antennae basi contiguae. Yerticis rostrum breve, sulcatum, marginibus scrobum antennarum 

 cinctum, ergo haud prominens. Pronotum sulcis transversis duobus distinctis impressum. Tibiae anticae 

 supra planae, raro teretes, foraminibus conchatis, sulcis lateralibus longitudinalibus nullis, spinis apicalibus 

 nullis instructae. Tibiae posticae supra spinis apicalibus destitutae f. Elytra marium tympano instructa. 

 {Brunner v. W.) 



The Pseudophyllinse may be divided into various groups by the structure of the 

 elytra, three types of which may be here noticed, two of them being American : — 



1. In this group the elytra are more or less narrow, generally but little coriaceous, 

 and somewhat transversely convex — so that in repose they form a rounded sheath 

 (cover]) for the body; they are cylindrical above, being compressed at the apex only. 

 The surface of these organs is either grey and rough, imitating the bark of trees, or 

 green, imitating leaves. In the males the anal field is small, and the tambourine much 



* Principal recent works referred to for this tribe : — 



C. Stal, Becensio Orthopterorum, part 2. Stockholm, 1874. 



Ch. Brtoner ton Wattenwyl, Monographic der Pseudophylliden. Wien, 1895. — A very complete and 

 genuine monograph of this tribe, which we have followed in this work. 



f This character distinguishes the Pseudophyllinae from the Mecopodinae, these latter having the posterior 

 tibise armed with two apical spines. Redtenbacher, however, has pointed out that a few Australian species, 

 which have quite the facies of Pseudophyllinae, seem to make an exception in this respect ; but Brunner v. 

 Wattenwyl states that the venulation of the elytra of these aberrant forms is more like that of the Mecopodinae, 

 and he prefers including them in that tribe. The Mecopodinae are not represented in the New World. 



3pf 2 



