LYGISTOPTERUS. a 
is continued to the front, the hind angles are acute and turned outwards, and the disk 
lacks the oblique ridge from the hind angle so characteristic of Lygistopterus. Both 
of these species also closely resemble Plateros lateritiws, which of course is known by 
its having no rostrum. 
LYGISTOPTERUS. 
Lygistopterus, Mulsant, Ann. Soc. Agr. Lyon, 1888, p. 39. 
A genus not hitherto recorded from the northern continent, if we except one species 
from the United States, which probably belongs to it (Z. perfaceta, Say), and having for 
its type the European Dictyoptera sanguinea. It is, however, well represented in South 
America by fine species of elongate parallel form, with the elytra blue or blackish at 
the apex, with the base more or less red. ; 
It may perhaps be best known by the deep irregular sculpture of its thorax, which 
consists of a central channel, continued to thé apex, of which the sides are often raised, 
and from the front of which an oblique carina proceeds to near the hind angles. The 
central channel is often angularly widened in the middle. The rostrum is variable in 
length, often very short. The antenne have the second joint short, but not so short 
as in the preceding genera. The elytra usually have three or four raised lines, the 
surface covered with very close intricate puncturing, partly concealed by fine close 
pubescence. 
Four species have at present been seen by me from Central America. 
1. Lygistopterus nobilis. 
Niger, nitidus, prothoracis margine laterali elytrisque flavis, his dimidio apicali nigro-ceruleis, sutura juxta 
scutellum nigra. Long. 15 millim. 
Hab. Nicaracva, Chontales (Janson). 
While superficially very much resembling L. eximius, Bourg., this species cannot be 
confounded with it if the following characters are observed :—the thorax has the width 
of the elytra at the base, is narrowed towards the front, the sides are much more 
widely yellow; and the elytra have a black patch round the scutellum, extending a 
little way down the suture. The rostrum is also of an average length, instead of being 
very short. 
2. Lygistopterus amabilis. (Tab. I. fig. 10.) 
Niger, nitidus, prothorace et elytris flavo-testaceis, his post medium nigro-cyaneis, illo vitta mediana nigra, 
angulis posticis late rotundatis. Long. 15-16 millim. 
Hab. Nicaraeua, Chontales (Le/t). 
Thorax disciform, the central channel rather linear and narrow, and, in one specimen, 
not distinct in front. Both the specimens are females; they have the apical segment 
with an acute incision, which is continued as a deep fovea to its base. 
