10 HEMIPTERA-HOMOPTERA. 
12. Cicada intermedia, un. sp. 
Allied to the preceding species, but abdomen much wider, the anterior margins of tympana and sides of 
base of first abdominal segment creamy white only. Underside of body pale, but less covered with 
whitish pubescence than in C. alacris, and transverse vein at base of second apical area placed much nearer 
the base of the first, the second apical area being thus longer, and the first apical area shorter than in the 
corresponding tegminal areas of the other species. 
Long. 22 millim., exp. tegm. 57 millim. 
Hab. Mexico (coll. Dist.). 
13. Cicada robusta, n. sp. (C. alacris, var., Tab. IL., figg. 3, 3.a, 3 6.) 
Body above black; head, pronotum, and mesonotum marked as in two preceding species; abdomen with a 
large pale yellowish spot on lateral margins of first abdominal segment. Underside of body and legs pale 
castaneous. Tegmina and wings pale hyaline; tegmina with the costa, costal membrane, and basal half of 
venation ochraceous, radial vein and apical venation fuscous, basal area and base of clavus pitchy, trans- 
verse veins at base of second and third apical areas broadly fuscous. Wings pitchy at base. 
The body is very broad and robust, as in C. intermedia; but the position and relative lengths of the first and 
second tegminal apical areas are as in C. alacris. The face, however, is broader and much more tumid than 
in that species; and the opercula are a little longer, reaching the apex of the first abdominal segment. 
This species is also much larger than the two others with which it is here compared, and the pale abdo- 
minal markings are different. . ; 
Long. 3 27 to 32 millim., exp. tegm. 74 to 80 millim.; 9 24 to 27 millim., exp. tegm. 70 to 76 millim. 
Hab. Mexico (Mus. Holm.), Cuernavacca (Bilimek, Mus. Vind. Ces.). 
The specimen figured is in the Vienna Museum. I had concluded that this species 
was but an extreme variety of C. alacris; but a long series which has passed through 
my hands since lettering the Plate has compelled me to believe in its distinct character. 
14. Cicada dissimilis, n. sp. 
Allied to the preceding species ; but the opercula are longer, reaching the second abdominal segment; the head 
-is much narrower and considerably less in width than the pronotum at base, the first apical area of tegmina 
very little longer than second, the upper transverse veins scarcely infuscated, the “ limbus enervis ” very 
broad, and basal area only slightly ochraceous and opaque. 
Long. 24 to 26 millim., exp. tegm. 72 to 82 millim. 
Hab. Mexico (coll. Dist. Mus. Berol.). 
The last four species here described may also be thus separated :— 
Abdomen elongate, not wider than the base of pronotum. . . .. .. . . C. hilaris. 
Abdomen broad, wider than base of pronotum. 
Tegmina with first apical area not much longer than second. 
Opercula reaching first abdominal segment . . . . . . . . . . C. intermedia. 
Opercula reaching second abdominal segment . . . wo. 2 2 « C. dissimilis. 
Tegmina with first apical area considerably longer than second » . . « « OC. robusta. 
TETTIGIA. 
Tettigia, Kolenati, Mel. Ent. vii. p. 6 (1857) ; Stal, Hem. Afr. iv. pp. 7, 23 (1866). 
Tettigia differs at once from Cicada in having the basal area of the tegmina twice 
