170 OETHOPTEEA. 



c. Colour variable, ranging from cinereous to fusco-ferruginous or 

 fulvo-fuscous, mottled and marmorate with black or dark brown. 

 Wings rose-colour, with a narrow fuscous border and a prominent 

 taenia reaching to the base ; the apex emarginately vitreous. Hind 

 edge of disc of pronotum subacute. Hind tibise banded with 



testaceous and fuscous 1. mexicanus, Sauss. 



cc. Colour uniformly ferruginous, without darker mottlings and mar- 

 blings. Wings tile-red, the fuscous border faint, the taenia in- 

 conspicuous and not reaching the base of the wing, the apes not 

 perceptibly hyaline. Hind edge of pronotum decidedly acute. 



Hind tibia; unicolorous, pale testaceous (?) to glaucous ( $ ) .2. ferruginosus, sp. n. 

 bb. Pronotum above plain, more gently cristate, the incision not oblique ; 

 the anterior edge very obtusely angulate, behind subacute. Wings 

 bright carmine, the taenia and border deep black ; apex emarginately 

 vitreous. Upper carina of hind femora not suddenly lowered . . 3. orizab<s, Sauss. 

 A A. Tegmina with their apices rounded. Head and pronotum less strongly 

 granulose ; scutellum of vertex more decidedly declivent, smoother. 

 Eyes larger. Pronotum carinate, but in nowise cristate; the anterior 

 border subtruncate. Wings yellow, the fuliginous band not reaching 

 the anal angle. Spurs of hind tibiae not greatly unequal 4. aztecus, Sauss. 



1. Tomonotus mexicanus, Sauss. 



Tomonotus mexicanus, Sauss. Rev. et Mag. Zool. xiii. p. 321 (1861) 1 ; Thomas, Acrid. N. Amer. 

 p. 211 (1873) 2 ; Rehn, Proc. Acad. Nat. Sci. Philad. 1904, p. 526 3 . 



Hab. Mexico, Cuernavaca (Saussure 1 : ? 6 ; O.W. Barrett'. 6 ), various localities 

 in Jalisco, &c. (Jas. A. G. Rehn), Rio Cocula [0. W. Barrett: $ ), Tehuacan (Mas. 

 Tacubaya: $ ). 



This is a rather variable insect with respect to both size and colour, but it always 

 seems to have the characteristically banded hind tibiae, which feature is absent from 

 the other described species of the genus. 



2. Tomonotus ferruginosus, Bruner. 



Tomonotus ferruginosus (Bruner), Caudell, Proc. U.S. Nat. Mus. xxviii. p. 470, fig. 4 (1905) \ 

 ? Arphia behrensi, Rehn, Trans. Am. Ent. Soc. xxix. p. 11 (1902) 2 . 



This species in its general structure comes nearest to T. mexicanus, Sauss., but differs from it in the rather 

 more slender form, the less strongly granulose head and thorax, the more elongate and angulate 

 pronotum, the longer and narrower antennae, and the plain, unhanded hind tibiae and femora, and also in 

 being of a uniform ferruginous colour throughout, instead of having the tegmina and body mottled and 

 marbled with fuscous. The present insect, moreover, has the wings tile-red, instead of rose-colour 

 and the margin, along with the shorter and less conspicuous taenia, smoky brown, instead of fuliginous. 

 Its hind tibiae vary from pale greenish yellow in the female to deep glaucous in the male, while in 

 T. mexicanus these members are pale and dark-banded, as in Spharagemon bolli. 



Length of body, <S 20, $ 32; of antennae, <$ 8, $ 10-5; of pronotum, <$ 5-5, £ 8-5; of tegmina, <j 20-5, 

 2 28 ; of hind femora, 6 13, $ 17 millim. 



