208 OETHOPTEEA. 



Var. a. Obscurus, parum flavo-variegatus ; pronoti angulis posticis flavis. [Texas.] 

 Var. 6. Maxime flavo-pictus, vel flavus, fusco-rufo variegatus. [Cuba.] 



Hab. Noeth America, Texas.— Antilles, Cuba (Dr. Krug). 



Somewhat larger than T. histrionicus, and apparently differing from that species by 

 the two little spines of the posterior tibiae. (Description taken from my manuscript 

 notes.)] 



[7. Tridactylus (Heteropus) denticulatus, Sauss. 



Tridactylus denticulatus, Sauss. Miss. Scient. Mex., Orthopt. p. 353. 6, t. 8. figg. 26, 26 a {$)-, 

 Mel. Orth. 5* fasc. p. 54 10 (<?). 



Sat minutus, crassus, fuscus, pedibus plus minusve flavo-pietis ; tibiis posticis flavis, robustis, in utroque 



margine erasse serratis (denticulis 8-9) ; calcaribus superis crassiusculis, valde uncinatis ; metatarso 



longissimo, quam calcaria longiore.* — Long. 5 millira. 

 $ . Penultimum segmentum ventrale majusculum, subquadratum, margine postico arcuato ; ultimum trans- 



versum, subrotundatura, sulco divisum, corneum. Appendices anales gracillimi. 

 c? . Penultimum segmentum ventrale transversum ; ultimum parum productum, transversum, trapezinum vel 



subrotundatum, margine apicali truncate Appendices anales mediocres. 



Hab. Amazons, Para (Mus. Genavense).] 



RHIPIPTERYX, Newm.* 



RMpipteryx, Newman ; — Brulle ; — Serville ;— -Saussure, Miss. Scient. Mex., Orthopt. p. 354 ; Mel. 

 Orthopt. 5 e fasc. p. 55. 



Feminse ovipositore brevi quadrivalvo instructs. Cerci obsolete multiarticulati. Appendices anales inferi in 

 forma variabiles. , 



Bhipipteryx seems to be almost as nearly allied to the Acridiidae, especially to the 

 genus Tettix, as to the Gryllotalpinse. Indeed, all their general characters are more 

 those of Acridiidae : head perpendicular ; the pronotum in the shape of a saddle ; the 

 anterior legs longer, more slender, and less fossorial than in the Tridactyli ; the elytra 

 placed on the back in the form of a roof ; and the females with a short ovipositor, 

 much resembling that of the same sex of the Acridiidae. Nevertheless, Bhipipteryx 

 has an intimate relationship with the Tridactyli. 



Their habits are not known, but it is probable that they are very similar to those of 

 Tridactylus. The species of Rhipipteryx are presumed to burrow in the sand, for their 

 anterior tarsi can be doubled up in the ridge of the tibia?, so as to leave the apical spurs 

 of the latter free, as in Tridactylus; but, having loDger and thinner legs, their digging 



* Explanation of the figures on Tab. XI. figg. 8-14, relating to the genus Rhipipteryx : nos. 6-io, normal 

 numbers indicating the numerical order of the abdominal segments or their homologues. — Fig. 8, R. mexicana, 

 extremity of" the abdomen, $ , seen from above — 8 u, inferior valvee of the ovipositor ; 9 6, 9 o, superior 

 valvse of the ovipositor. — Fig. 9, extremity of the abdomen, $ , in profile. — Fig. 10, ditto, $ , seen from above, 

 opened and dissected. — Fig. 11, ditto, from beneath.— Fig. 12, extremity of the abdomen, <$ , seen in profile. — 

 Fig. 13, ditto, from above. — Fig. 14, ditto, from beneath. 



