58 HOMOPTERA 



Geographical distribution : The three species which have been described in this genus are all 

 from western United States and Lower California as foUows : 



1. cornutus Goding, Can. Ent. XXVII : 274 (iSgS). — Pl. I , fig. I I . California, Utah. 



2. digitatus Van Duzee, Calif. Acad. Sci. XII : ii. 170 (1923). California, Utah, Lower Cali- 



fornia. 



3. planifrons Van Duzee, Calif. Acad. Sci. XII : 11. 170 (igzS). Cahfornia, Lower California^ 



San Marcos Isl. 



GENERA OF TRIBE BOLBONOTINI GODING 



I. Body globular ; rugose and carinate 



A. Tegmina with two discoidal cells Bolbonota A. & S. 



B. Tegmina with four discoidal cells . BoLBONOTODEsFowler. 



II. Body elongate or triangular 



A. Tegmina with ihree discoidal cells; metopidium carinate above eyes 



1. Dorsum straight Erechtia Walker. 



2. Dorsum strongly sinuate . Tylopelta Fowler. 



B. Tegmina luith two discoidal cells; metopidium smooth above eyes 



1. T egmina entirely free ; dorsum straight Leioscyta Fowler. 



2. Tegmina ahnost entirely covered by sides of pronotum; dorsum sinuate . . Taunaya da F^onseca. 



13. Genus BOLBONOTA Amyot and Serville 



Bolbonota Amyot and Serville, Hemip. 537 (i^^^)- 

 Tetpaplatis Walker, List Hom. B. M. 77 (i85i). 

 Tubercunota Goding:, Can. Ent. XXV : 55 (1893). 

 Bulbonota Kirkaldy, Ent. XXXVI : 232 (i9o3), 



Characters : This is one of the genera which in the opinion of the Natural Selectionists offers 

 a good illustration of the resemblance of insects to seeds, and, indeed, these insects do look very much 

 like small, shriveled, wrinkled seeds in their shape and sculpturing. In fact, the small size, globular 

 form, and crinkled and corrugated appearance of the pronotum are characters which readily distinguish 

 this genus and the closely related genus Bolbonotodes from all other Membracidae. Other characters are 

 the absence of pronotal horns, the broadl}' fiattened head and tibias, and the particular fact that the 

 tegmina have only two discoidal cells. The species are all small in size and usually very dark in color. 



Type nisus Germar. 



Geographical distribution : The genus is limited to Central and South America from which 

 regions a considerable number of species have been described. However, since most of these species 

 were described on the basis of size and on the appearance of the corrugated surface of the pronotum, 

 and since these characters vary greatly even within a species, we are suspicious that all of the species 

 here listed may not be valid. 



1. aspidistrte Haviland, Zoologica VI : 3. 241 (1925). Guiana. 



2. aureosericea Stal, Rio Jan. Hem. II : 24. 2 (i858). Brazil. 



3. auripennis Fairmaire, Rev. Memb. 2^9. 7 (1846) Brazil. 



4. bispinifera Goding, Can. Ent. XXV : 55 6 (1893). West Indies. 



