82 LONGICORNIA. 
black spot commencing a short distance behind the scutellum (to which it is some- 
times joined by a narrow black sutural edging) forms a long broad sutural vitta with 
straight sides until near the apex, where it is suddenly dilated to the lateral margin. 
The black basal fascia is variable in width. The punctuation of the elytra is coarse, 
and becomes scarcely finer towards the apex; but the punctures are more separated 
near the base, and dense or even confluent near the apex. ‘The prothorax is black 
beneath in all the specimens. 
9. Crossidius trivittatus. 
Minus elongatus, niger, longe hirsutus, elytris fulvis vitta communi suturali alteraque discoidali (apicem haud 
attingente) cyaneo-nigris; antennis ¢ fere dupla corporis longitudine, basi sparsim ciliatis, articulo 
ultimo ceteris longiore apice curvato; thorace subquadrato vix rotundato, dorso grossissime discrete 
punctato, calloso, callo discoidali ovali levi; scutello breviter triangulari; elytris passim modice punctatis, 
lineis paullo elevatis subleevibus utrinque duabus, apice obtuse subtruncatis. 
Long. 53 lin. oC. 
Hab. Mexico (Truqui). 
Differs from the rest of its congeners in the elevated lines of the elytra, which, 
although only rudimentary, indicate a relationship with Mannophorus, Ischnocnemis, 
and other genera distinguished by raised ivory-like stripes on these organs; the 
resemblance is increased by the rudimentary lines being in the centre of the two 
- yellowish vittee which alternate with the blue-black stripes of the elytra. The thorax 
is acutely margined at the base, the lateral (posterior) angles showing an acute pro- 
jection similar to that which is exhibited in an exaggerated degree in Entomosterna 
and allied genera. The long tawny hairs with which the body and legs are densely 
clothed, the declivous mesosternum, short hind tarsi, and equilateral triangular 
scutellum induce me to place the species in Crossidius. 
MANNOPHORUWS. 
Mannophorus, Leconte, Proc. Acad. Phil. 1853, p. 442. 
A genus restricted, as far as at present known, to Northern Mexico and Texas. It 
_ is very closely allied to other small generic groups from the same region. 
1. Mannophorus letus. 
Mannophorus letus, Leconte, loc. cit. p. 442°. 
Hab. Norta America, Texas 1—Mexico, Alvarez Mountains (Dr. Palmer). 
The species was sent to me authentically named by Dr. Horn of Philadelphia. 
2. Mannophorus ferreus. 
Subcylindricus, senescenti-niger, breviter griseo pubescens; thorace lateribus regulariter rotundatis, supra 
grossissime confluenter punctato, interdum rufo maculato; elytris utrinque costa elevata levi apicem 
