452 STAPHYLINIDA. 
the punctures are confluent, and with no smooth space along the middle. Elytra 
deeply and very densely punctate. 
This species is most remarkable on account of its sculpture, and is very Stilicoid in 
form. The male differs from the female in having the mandibles much broader, and 
the whole of the underside of the head, including the mentum, and the bases of the 
maxille and labium covered with a dense fine punctuation, rendering these parts opaque, 
and with a minute pubescence; while in the female the parts named are in the normal 
condition, the head being shining beneath and bearing coarse punctures; there is no 
emargination of the last ventral plate. 
Mr. Champion found a series of a dozen examples, under decaying leaves and 
vegetable rubbish, on the banks of running streams in the forest of the low country. 
The figure is taken from a male. 
LINODERUS. 
Corpus gracile, haud depressum; antennis pedibusque elongatis, gracilibus. Tarsi posteriores articulo basali 
elongato, quam articulus apicalis longiore. Palpi labiales, articulo intermedio sat elongato quam articulus 
ultimus paulo longiore. Antenne multo post marginem frontis anteriorem inserte. Cox intermedize 
distantes. 
I have separated this insect on account of the insertion of the antenne at some 
distance behind the front margin of the head; they are not inserted in large cavities, as 
in Chroaptomus; and the slender labial palpi, as well as numerous other characters, 
distinguish it from the genus just named, to which, indeed, it is not allied by any 
other character than the position of insertion of the antenne. ‘The side-piece of the 
prothorax is extremely small and moderately inflexed; the prosternum is divided by 
a well-marked transverse ridge; the portion behind this ridge is polished and not 
strigose. The extremely slender legs have the femora destitute of spines, and the 
tibie clothed with long hairs, but with no true spines. The front tarsi are quite 
undilated in each sex, and the claws are small. 
1. Linoderus gracilipes. (Tab. XII. fig. 2.) 
Gracilis, haud depressus, sanguineo-rufus, nitidus; capite elytrisque cyaneo-viridibus ; antennis basi apiceque 
testaceis, medio nigricante; tibiis plus minusve nigricantibus; abdominis postico nigro, parce punctato; 
thorace seriebus discoidalibus subtiliter 4- vel 5-punctatis. 
Long. 8 millim. 
Hab. Panama, Volcan de Chiriqui, Bugaba? (Champion). 
Antenne slender and elongate, with the three basal and the two apical joints yellow, 
the three basal joints remarkably elongate. Head narrowed behind the eyes. Thorax 
slender, the discoidal and other punctures fine; the number of punctures in each series 
may be four, five, or six, five being usual; the anterior one is remote from the others. 
Scutellum red, with a few coarse punctures. Hind body slender, quite sparingly punctate, 
the two terminal segments and the armature black. Under surface of the head with a 
