14 HEMIPTERA-HOMOPTERA. 
opercula, is ochraceous, the abdomen having the lateral margins and anal appendage black. Its principal 
structural difference is the length of the rostrum, which reaches the apex of the first abdominal segment. 
Long. 24 millim., exp. tegm. 71 millim. 
Hab. Mexico (Bilimek, Mus. Vind. Ces.). 
SELYMBRIA. 
Selymbria, Stal, Ann. Soc. Ent. de Fr. sér. 4, vol. i. p. 615 (1861) ; Hem. Afr. iv. p. 7 (1866). 
In this and the two following genera the space between the postcostal vein and ulnar 
ramus is distinctly ampliated towards the apex. The lateral margin of the pronotum 
is not ampliated; and, as described by the author, “ segmento ventrali ultimo feminarum 
profundissime sinuato.” 
One species is known from Central America. 
1. Selymbria modesta, n. sp. (Tab. IIL figg. 8, 8 a, 8b.) 
d+ Body dull testaceous. Head with the frontal margin, area of the ocelli, and posterior margin of eyes 
fuscous. Pronotum with two central fuscous fasci on anterior margin, and sometimes two smaller ones 
on posterior margin. Mesonotum with two large obconical central spots on anterior margin ; on each 
side of these a longer and more obscure obconical fascia, and a transverse fascia on disk, preceded by two 
small spots, fuscous. Basal margins of scutellum and abdominal segments fuscous. Body beneath paler ; 
anterior margin of head and inner margin of eyes black. Tegmina pale hyaline; neuration ochraceous or 
dull testaceous (sometimes with the basal half much paler); transverse veins at the base of second and 
third apical areas, and a submarginal row of spots on longitudinal veins of first, second, and third apical 
areas fuscous. Wings pale hyaline, with the nervures ochraceous or testaceous. 
Head, including eyes, equal in breadth to base of pronotum; face with a very deep central longitudinal sulca- 
tion, and strongly and transversely striate. Opercula pale, broad, not passing base of first abdominal 
segment, and narrowed but not meeting interiorly. 
Long. 16 millim., exp. tegm. 57 millim. 
Hab. Mexico (Mus. Holm.; Bilimek, Mus. Vind. Cos.); Nicaragua, Chontales 
(Janson). | 
This is the only Central-American species of the genus with which I am acquainted. 
It varies somewhat in the markings of the pronotum and mesonotum. 
TYMPANOTERPES. 
Tympanoterpes, Stal, Ann. Soc. Ent. de Fr. sér. 4, i. p. 614 (1861); Hem. Afr. iv. p. 7 (1866). 
Tympanoterpes differs from Selymbria in having the lateral margins of the pronotum 
somewhat ampliated, and “‘ segmento ventrali ultimo feminarum haud vel medio leviter 
emarginato.” 
The genus is possibly a purely Neotropical one; and but one species is here enumerated. 
1. Tympanoterpes gigas. (Tab. I. figg. 9, 9a, 96.) 
Cicada gigas, Oliv. Enc. Méth. v. p. 750.15, t. iii. £.4; Walk. List Hom. i. p- 104. 3°. 
Cicada triupsilon, Walk. List Hom. i. p. 103. 2. 
Cicada sonans, Walk. ibid. p. 104. 4. 
