TIGAVA.—DICHOCYSTA. 33 
lamine stramineous; the pronotum with the median and marginal carina, the anterior margin, and the 
triangular posterior portion stramineous ; the elytra with the discoidal area in part, a long oblique streak 
extending from about the middle to the inner margin near the tip, and a patch on the outer part opposite 
the end of this, smoky-black, the outer part of the costal area thence to the base stramineous; the 
antenne testaceous, with the apical joint (except at the extreme base) black, the second joint infuscate, 
and the third flavous at the tip; the legs testaceous, the tarsi black. Head with a single frontal spine ; 
eyes rather large, prominent ; antennz with the elongate basal joint scarcely so long as the head and half 
the pronotum united. Pronotum densely and rugosely, the posterior portion more sparsely, punctate, 
tricarinate, and also sharply carinate at the sides from the base to the apex, with a transverse raised callus 
on either side anteriorly. Elytra very elongate, narrow, subparallel, extending to far beyond the apex of 
the abdomen ; the discoidal area elongate-triangular, not reaching the middle, limited externally by a 
straight raised nervure and inwardly by an oblique one, aud partly open behind; the costal and subcostal 
areas very narrow, about equal in width, the costal area with a single row of smali areole. Wings 
extending to beyond the abdomen. 
Length 4, breadth 1 millim. 
Hab. Mexico, Vera Cruz (H. H. Smith). 
Three specimens. Very like 7. precellens, Stal, from Rio Janeiro, the type of 
which is before me, but differing from it in having much smaller areole along the costal 
margin of the elytra, the costal area itself being very narrow and the discoidal area 
less distinctly margined behind. The basal joint of the antenne is also rather less 
elongate, the eyes are more prominent, the general coloration is less uniform, and the 
insect itself is a little smaller and narrower. 
2. Tigava convexicollis, n. sp. (Tab. IL. figg. 29; 29a, part of the body 
beneath.) 
Head black, the decumbent lateral spines and the buccal lamine flavous; the pronotum ferruginous or flavo- 
ferruginous, with the transverse calli black, the anterior margin flavous; the elytra testaceous, with a 
mark on the discoidal area, and a \-shaped patch beyond it, extending to the costal and inner margins, 
and partly enclosing a subtriangular pallid or ochreous space, smoky or black; the antenne testaceous, with 
the apical joint black; the legs testaceous, the tarsi black ; the abdomen and the sterna in great part black. 
Head with a single frontal spine; eyes small, moderately prominent ; antenne with the elongate basal 
joint fully as long as the head and half the pronotum united. Pronotum closely punctured, tricarinate, 
the outer carine not very distinct and becoming obsolete in front, and feebly carinate at the sides poste- 
riorly, with a transverse callus on either side anteriorly. Elytra very elongate, narrow, extending to far 
beyond the apex of the abdomen, the costa slightly hollowed about the centre; the discoidal area not 
reaching the middle, limited externally by a straight raised nervure and inwardly by an oblique one, and 
partly open behind ; the costal and subcostal areas very narrow, the costal area with a single row of 
small, oblong areole. 
Length nearly 4, breadth 1 millim. 
Hab. Panama, Volcan de Chiriqui 2000 to 4000 feet (Champion). 
Four examples. Differs from 7. precellens and T. pulchella in the feebly and 
incompletely margined pronotum, the outer carine of which are also much less distinct. 
The basal joint of the antenne is as long as in 7’. precellens. | 
DICHOCYSTA, n. gen. 
Rostrum reaching the end of the metasternum. Rostral groove parallel, uninterrupted, closed in front. 
Antenne somewhat distant at the base, joints 1 and 2 very short, stout, 3 elongate and more slender, 
slightly tapering outwards, truncate at the tip, 4 lanceolate. Head with five rather long decumbent 
BIOL. CENTR.-AMER., Rhynch., Vol. II., January 1898. 5 
