500 STAPHYLINIDA. 
Mr. Champion, and these two are again slightly different from the small series of Colom- 
bian examples in my collection; the distinctions are merely of minor details, and there 
is no ground at present for regarding the examples as other than all exponents of one 
somewhat variable and rather widely distributed species. 
4. Thyreocephalus cyanipennis. 
Nigerrimus ; elytris cyaneis, nitidis, parce fortiter punctatis; abdominis segmentis duobus ultimis rufo- 
testaceis ; capite magno, disco post sulcos frontales fortiter punctato. 
Long. 20 millim. 
Hab. Panama, Volcan de Chiriqui 4000 to 6000 feet (Champion). 
This species differs from 7. salvini almost solely by the bright red termination of the 
hind body; the elytra are of rather darker colour and a little more sparingly punctate. 
One example only has been met with; it is a well-developed male. 
5. Thyreocephalus unicolor. 
Nigerrimus, nitidus; capite magno, fortiter punctato; elytris parce, subseriatim, sat fortiter punctatis. 
Long. 18 millim. 
Hab. Mexico, Jalapa (Flohr). 
This is another species excessively closely allied to 7. salvini, though readily distin- 
guished by the black wing-cases. The head is a little more densely punctured above, so 
that the coarse punctures behind the frontal grooves are scarcely isolated from the other 
punctuation, and on the under surface the sides are rather finely punctate, while a broad 
space on the middle is impunctate. The insect, too, is apparently rather broader, and 
the thorax is a little narrowed behind; and it has an acute elevation, almost a carina, 
on the prosternum between the front coxe. 
This insect was discovered by Mr. Flohr in the flowers of a Bromelia. The three 
examples sent me, though much damaged, appear to agree entirely, except that one 
has the head rather narrower than the others, probably a sexual character. 
6. Thyreocephalus rufipennis, (Tab. XIII. fig. 4.) 
Nigerrimus, nitidus ; elytris rufis, crebrius fortiusque punctatis ; tarsis rufescentibus ; capite majusculo, crebrius 
fortiusque punctato, sat nitido. 
Long. 15-18 millim. 
Hab. Mexico, Oaxaca (Hoge); Guatemata, San Gerénimo (Champion). 
This and the following species are readily distinguished from 7. salvini and its allies 
by the fact that the prosternum is acutely carinate behind, and the punctuation 
more evenly distributed over the upper surface of the head. In Z. rufipennis the head 
is broader than the thorax, but not greatly so, and is not at all broader than long ; its 
punctuation is so close that the interstices only occupy as much space as the punctures 
themselves: these are rather elongate and narrow, and are densest on the part between 
