286 SUPPLEMENT. 
Discodon marginatum (p. 80). 
To the localities given, add :—Mexi0o, Jalapa, Playa Vicente (Hoge). 
The Mexican specimens show more variation than those from Guatemala, the thorax 
in most of these being entirely yellow, but in one there is a black spot; the head is 
also variable, being black at the base in some, quite yellow in others; all are smaller 
and have less infuscate elytra, yet I should not think there is specific distinction here. 
Discodon vitticolle (p. 81). 
To the localities given, add:—Panama, Bugaba, Volcan de Chiriqui 2000 to 4000 
feet (Champion). 
Var.? Elytris nigris, callo humerali flavo, pedibus nigris. 
Had. Mexico, Parras, Monclova, and Saltillo in Coahuila (Dr. Palmer). 
7 (a). Discodon tenue. 
Nigro-piceum, parallelum, subnitidum; ore, antennarum basi, prothoracis limbo, pedibusque basi flavis albes- 
centibus. Long. 53-6 millim. ¢ 9. 
Mas. Prothoracis lateribus infra medium constrictis, disco utrinque bifoveolato, levi; unguiculis intermediis 
et posticis externis fissis. 
Femina. Prothoracis lateribus trisinuatis, angulis posticis acutis paullo productis. 
Hab. GuateMata, Quiche Mountains 8000 to 9000 feet (Champion). 
This little species is, in the mode of the constriction of the thorax in the male, 
allied to Discodon carbonarium, and, though smaller, reminds one very much of that 
species in its general form. The head, however, is less contracted behind in the male ; 
the hind angles of the thorax in the female are more acute and prominent, and the 
margin immediately above them is deeply sinuate. ‘The mouth and front of the head 
is whitish ; the sides and basal margin of the thorax are white, the front margin very 
narrowly so, but it is only the reflexed edge that is pale. The coxe, trochanters, and 
bases of the femora are pale whitish yellow; the margin of the first four segments of 
the abdomen, and the two apical and pygidial plates, are pale yellow. 
7 (s). Discodon cinereum. 
Atrum, subopacum ; prothoracis limbo laterali tenuiter flavo. Long. 6-7 millim. ¢ 9. 
Mas. Prothoracis lateribus infra medium sinuatis, subconstrictis, margine supra medium dentiformi, incrassato ; 
unguiculis intermediis et posticis externis fissis. 
Hab. Guaremaa, Calderas, Quiche Mountains (Champion), Volcan de Fuego (Salvin). 
Very much like the preceding species at first. sight, but wider; the body beneath, 
the head, and legs entirely deep black; the antenne with their joints wider and 
compressed; the thorax differently notched in the male, its sides rufous; the elytra 
more rugose, with faint indications of strie, and of a slight ashy grey tint, from the 
fine pubescence with which they are clothed (in many examples, however, this is not 
