TEACH YKHACHIS. 175 



ee. Wing-band almost wanting, incomplete or interrupted 

 anteriorly. 

 f. Fuliginous band almost entirely obliterated, showing 

 only as a small clouded area anteriorly aud another 



in the radial field [obliterata, Bruner.] 



ff. Fuliginous band much less interrupted, and in some 

 instances nearly complete. 

 g. Smaller ( £ 14-16, ? 20-22 millim.). Pronotumvery 



strongly rugose 5. texana, Sauss. 



ffff. Larger ( $ 17-20, ? 24-26 millim.). Pronotum less 

 strongly rugose. 

 h. Head of moderate size. Pronotum not greatly 



constricted near middle 6. fuscifrons, Stal. 



hh. Head large. Pronotum greatly constricted near 



middle 7. capito, Stal. 



cc. Wings with the disc usually red. 



d. Sides of pronotum with a small white spot. Taenia of wings 



reaching the base [nevadensis, Bruner.] 



dd. Sides of pronotum with the lower edge broadly pale, crossed 

 above by an oblique dark band. Taenia of wings extending 

 but a short distance towards the base. 

 e. Tegmina pale on posterior half, the dark markings con- 

 fined to anterior half. Disc of wings either red or 



yellow, usually the latter [plattei, Thorn.] 



ee. Tegmina with the dark markings occupying the entire 

 member, the larger ones, however, confined to the 



anterior half. Disc of wings carmine [8. rubripennis, sp. n.] 



A A. Tegmina regularly and evenly marked with large dark patches, as 

 in the majority of the species of Hippiscus. Wings with the disc 

 pale yellow, crossed by a broad arcuate fuliginous band . . . [coronata, Scudd.] 



1. Tracliyrhachis mexicana, Sauss. 



Psinidia (Trachyrhachis) mexicana, Sauss. Prodr. (Edip. p. 164 (1884) \ 

 Mestobregma mexicanum, Rehn, Proc. Acad. Nat. Sci. Philad. 1904, p. 527 2 . 



Hab. Mexico l , Guadalajara, Jalisco (McClendon 2 ), La Joya, San Luis Potosi 

 (M, E. Hoag), Tlalpam (L. Bruner). 



The collections of Godman and Salvin do not contain specimens of the present, nor 

 of any of the following species belonging to the genus. 



2. Trachyrhachis compacta, sp. n. 



Very similar to the preceding in general appearance, but slightly more robust, the pronotum more strongly 

 rugose and with the median carina less elevated anteriorly, where in the present species the incisions are 

 less profound. In T. compacta the sulcus of the fastigium is provided with a V-shaped carina that projects 

 into it from the deep pit at the upper edge of the frontal costa between the lateral foveolae. The present 



