206 ORTHOPTEKA. 



Var. Tibiae anticse $ apice tan turn 3-dentatae. ° 



2 . Inoerfca (comp. T. incertus, infra). 

 2 d • Long. corp. 6, cum alis 7'5 millim. 



Hab. Noeth Ameeica, Carolina and Louisiana (Saussure), Texas (Boll). — Mexico, 

 Tamaulipas (Saussure). 



Of the size of T. apicalis. In the males the anterior tibiae are parted at their apical 

 margin by a cuneiform notch, and each portion of the margin forms two triangular 

 teeth, each bearing one of the four spurs. In some specimens the notch is less distinct, 

 and the tibiae thus resemble those of the females in general. 



In the males the last two ventral segments of the abdomen are lamellate, the penul- 

 timate segment transverse, the terminal plate nearly square when it is uufolded, as in 

 T. mixtus — more or less elongate, according to whether the segment is extended or 

 contracted. 



3. Tridactylus incertus. (Tab. XI. fig. 6.) 



2 . T. apicali et T.fissipedi simillimus, tibiis anterioribus tamen ut in feminis solitum simplicibus, normalibus, 

 subpiriformibus, margine apicali baud diviso, calcaribus 4 regulariter armato. Penultimum segmentum 

 ventrale transversum, margine postico in medio incisura minuta notato (baee nonnunquam per discum 

 rufum impleta). Ultimum segmentum quadratum, subtrapezinum, integrum, scilicet per sulcum nullum 

 divisum, luteum vel fuscescens. 



Figure. — Extremity of the abdomen, $ , from beneath — 8, penultimate ventral segment, showing the notch ; 

 9 i, last ventral segment ; c, cerci ; a, anal appendages. 



Sab. Noeth Ameeica, Texas (Boll). — Mexico (Sumichrast). 



This is certainly not a distinct species ; it can be only the female of T. apicalis or 

 T.Jissijpes, but it is impossible to decide to which of them it belongs. I am inclined 

 to regard these females as belonging to T. fissipes, but I am obliged to give them a 

 provisional name. 



4. Tridactylus mixtus, Hald. 



Xya mixta, Haldeman, Proc. Acad. Phil. vi. p. 364 (1853). 

 Tridactylus mixtus, Sauss. Miss. Scient. Mex., Orthopt. p. 353. 4 *. 



Majusculus, brunneus, flavido-variegatus, pedibus flavo-fasciatis. Alse abdominis longitudine. Pedes antici 

 in utroque sexu simplices similesque, apice calcaribus 4. Tibise posticae et tarsi omnes sulfurei. Tibiae 

 postieae margine externo dentibus subtilibus 3-4 serrulato. Metatarsus posticus dimidise longitudine 

 calcarium paulo longior. Appendices anales teretes. — Long. corp. 8 - 6, cum alis 10*5 millim. 



2 . Penultimum segmentum ventrale transversum ; margine postico leviter inciso ; ultimo subquadrato, indiviso 

 (si cut in T. incerto). 



tf. Ultima segmenta 2 ventralia lamellaria. Lamina infragenitalis longiuscula, subquadrata vel elongato- 

 trapezina ; segmentum praecedens transversum. 



Hab. Noeth Ameeica, Louisiana, Carolina, Texas. — Mexico (Saussure). 



The specimens from which tbe above diagnosis is taken belong, I believe, to T. mixtus, 



* Erratum : instead of par sa plus petite taille, read par sa plus grande taille. 



