32 HEMIPTERA-HOMOPTERA. 
B. Pronotum shield-shaped, sinuate behind shoulders, broad, 
with apex blunt, and without dorsal horn or prominence ; 
head narrower . . . . . . » . . « Hoplophora, Germ. 
2. Posterior process of pronotum ‘long and sharp, reaching 
nearly or quite to apex of tegmina; anal cells of wings 
small; dorsum with a strong, usually sharp and spinose, 
horn, situated at a greater or lesser distance from the 
metopidium ....... . . . 6 . « . . Umbonia, Burm. 
TRIQUETRA. 
Triquetra, Fairmaire, Ann. Soc. Ent. Fr. sér. 2, iv. p. 279 (1846); Stal, Ofv. Vet.-Ak. Forh. 
XXvi. p. 265 (1869). 
This is rather an important genus, containing about a dozen species, which are, for 
the most part, recorded from Bogota; one or two occur in Venezuela and Brazil. 
Triquetra is very poorly represented in Central America, except in the case of one 
species, which appears to be locally abundant. ‘The species are, as a rule, rather large, 
and have the humeral projections much developed, forming long pointed horns; the 
front of the pronotum is in some species armed with a longer or shorter horn, and in 
others merely bluntly rounded or subangulate. The insects are of the same colour in 
life as the thorny plants or shrubs which they frequent, and, as they sit close to the 
stalks, they may easily be mistaken (as in the case of the species of Umbonia) for 
thorny excrescences, their somewhat formidable appearance being therefore merely 
protective. 
. The genus is allied to Umbonia, but differs in the strongly tectiform pronotum and in 
the fact that the wings have four apical areas ; the humeral projections, moreover, are, 
as a rule, much longer and more slender. 
1. Triquetra grossa. (Tab. III. figg. 10, 10a.) 
Triquetra grossa, Fairm. Ann. Soc. Ent. Fr. sér. 2, iv. p. 280°. 
Triquetra virgata, Fairm. loc. cit. p. 282’. 
2. Triquetra virescens, Fairm. loc. cit. p. 281°. 
Umbonia terribilis, Walk. Ins. Saunders., Homopt. p. 66". , 
Hab. GtatemaLa, Cubilguitz and San Gerénimo in Vera Paz, El Tumbador, Cerro 
Zunil, Panajachel 5000 feet, Pampojilaj (Champion); Costa Rica (Mus. Vind. Ces.), 
Volcan de Irazu 6000 to 7000 feet, R. Sucio, Caché (Rogers); Panama, Boquete 3500 
feet, Volcan de Chiriqui (Champion).—Cotomsia!*, Bogota? (Mus. Roy. Belg. ; 
Mus. Vind. Ces.); VENEZUELA. 
I have placed the above names under 7. grossa after examining a large series. 
Fairmaire? himself says of 7. virgata that it closely resembles 7. virescens, and Stal 
