490 STAPHYLINID A. 
the establishment of a separate genus at present, especially as these insects have the 
narrow prothoracic side-piece in common with the typical Leptacint. 
1. Leptacinus grandiceps. (Tab. XIII. fig. 5.) 
Minor, nitidus, piceus ; antennis pedibusque testaceis ; capite latiore, nigricante, crebre fortiter punctato; pro- 
thorace seriebus dorsalibus circiter 8-punctatis ; elytris fere impunctatis. 
ong. 4-5 millim. 
Hab. Guatemata, Las Mercedes 3000 feet, El Tumbador 2500 feet, Coatepeque 1300 
feet (Champion); Panama, San Feliz, Bugaba (Champion). 
The size of the head is liable to some variation, but is always larger than it is in 
Xantholinus larus, X. vilis, and the other small species of that genus. It is usually a 
good deal broader than the thorax or elytra, but is not round, for though the sides are 
rounded, they are also a good deal narrowed towards the front; the sides of the head 
are peculiarly formed; there exists a distinct genal space at the sides analogous to that 
I have described in X. crassiceps, but in the L. grandiceps the superior line is distinct, 
and the lower line is effaced; the underside of the head as well as this lateral space 
being opaque in marked contrast with the very polished upper surface. The second 
and third joints of the antenne are short; and there is a carina on the prosternum, this 
part being usually yellow. 
In the series of eight examples there is a little variation in the size of the head; the 
specimen figured is from Coatepeque. 
2. Leptacinus oscillans. 
Minor, nitidus, piceus; capite nigricante, elytris fusco-testaceis ; capite sat lato; antennis, palpis pedibusque 
testaceis ; prothorace seriebus dorsalibus 10-punctatis. 
Long. 5 millim. 
Hab. Nicaragua, Chontales (Janson); Panama, Bugaba (Champion). 
This little insect will no doubt at first be considered by others, as it was by myself, as 
a variety of Xantholinus lavus or X. vilis, but it is really more nearly allied to Z. 
grandiceps, as shown by the small terminal joint of the maxillary palpus and the 
structure of the head; this latter is larger than it is in either of the two species 
of Xantholinus mentioned, and less oblong, being more narrowed to the front; 
the genal space described in ZL. grandiceps exists also in this species, but is less 
distinct, the curved line limiting it being only distinct near the eye, and the punctu- 
ation in the space is not rugose, but is rather coarse, and has shining interstices, and 
the underside of the head is not opaque. The elytra are hardly so long as the thorax, 
and have a scanty punctuation. Only one example has been met with, in each of the 
localities; though differing in some of the slighter details, they must at present be 
considered as one species; but I may mention that the exponent from Bugaba has 
the wing-cases evidently longer than they are in the typical example from Chontales. 
