AMBLYDISCA. 209 
AMBLYDISCA. 
Amblydisca, Stal, Kongl. Sv. Vet.-Ak. Handl. Band viii. 1 (Hemipt. Fabr. ii.), p. 61, nota (1869). 
In this genus the pronotum is narrowed in front, the head has the vertex strongly 
impressed, and the metopidium is flat or slightly depressed ; the chief character, how- 
ever, lies in the clypeus, which is strongly raised and, when viewed from the side, forms 
almost a right angle; the depressed metopidium and the part of the clypeus above the 
angle lie in nearly the same plane. The characters of the front part of the head are 
much the same as those on which Amyot and Serville founded the genus Sphenorrhina ; 
but the head varies so much in shape in different species belonging to the last-named 
genus, and so many intermediate forms occur, that it is impossible to draw a hard-and- 
fast line between Sphenorrhina and its allied genera, whereas the characters of 
Amblydisca appear to be distinct and constant. I have no hesitation, therefore, in 
adopting Stal’s genus, which he used for the reception of Tettigonia (Aulacizes) rubri- 
ventris, Sign., and three species described by himself under Aulacizes. 
1. Amblydisca salvini, sp.n. (Tab. XIII. figg. 2, 2 a.) 
Fusco-castanea, antice flavo-maculata, tegminibus olivaceo-virescentibus marmoratis, maculis quatuor flavis ; 
vertice brevi, apice late rotundato, impressione profunda flava ; metopidio depresso, ad medium unimaculata; 
pronoto transversim rugoso, quinquemaculato, lateribus antice sensim angustatis; scutello macula 
rotundataé; tegminibus ad apicem subhyalinis, remotius punctatis; pedibus et pectore rufo-castaneis ; 
abdomine fusco ; alis fusco-purpureis. 
A large species ; front parts of a deep purplish-castaneous colour, with a round depression on the vertex, and 
with two spots on each side of the head and a central spot on the metopidium orange-yellow; vertex 
very short, slightly and broadly rounded; almost subtruncate ; eyes prominent; pronotum considerably 
broader than long, rugose, with an almost smooth transverse impression in front, and with a yellow spotin 
front and four others almost in a line about the middle; scutellum smooth in front, finely rugose behind, 
with a round yellow spot on its anterior portion ; tegmina olive-green, variegated with yellowish-green and 
mottled with castaneous, presenting a marbled appearance ; at the base near the shoulders are two yellow 
spots, one on each tegmen, and there are also two or three others at the sides of the sternum near these ; 
the apex of the tegmina is subhyaline and is furnished with a yellow spot, which is more or less irregular 
and often broken into two or three ; the underside and legs are reddish castaneous, the abdomen being 
fuscous. 
Long. 18 millim. ; lat. ad hum. 5 millim. 
Hab. Panama, Caldera, Bugaba, Volcan de Chiriqui 2500-4000 feet (Champion), 
Chiriqui (Mus. Holm.). 
This is the finest species of Tettigoniide in our collection, and I have also found a 
single example of it among some unnamed material belonging to the Stockholm 
Museum. A specimen from Bugaba is figured. 
2. Amblydisca rubriventris. (Tab. XIII. figg. 3, 3a.) 
Tettigonia rubriventris, Sign. Ann. Soc. Ent. Fr. 1855, p. 52, t. 6. fig. 5°. 
Aulacizes stellaris, Walk. List of Homopt. Ins., Suppl. p. 238 (1858) *. 
BIOL. CENTR.-AMEB., Rhynch. Homopt., Vol. II., December 1898. *27 
