650 STAPHYLINIDA. 
spinose; the penultimate ventral segment in the male is impressed at the base as well 
as deplanate and finely pubescent on its apical part, and the depression of the preceding 
segment is confined to the hind margin. 
Mr. Champion obtained a fine series of this species in Guatemala; but we have 
received only two examples from Mexico, and two from the State of Panama. The 
pair from this latter locality differ a little in possessing a somewhat finer sculpture, and 
being of rather shorter form. 
23. Stenus longiventris. 
Niger ; antennis, palpis pedibusque testaceis, Ularum clava fusca ; prothorace elytrisque densissime profundeque 
rugoso-punctatis; abdomine angusto, basi parce fortiter punctato, apice nitido, fere impunctato. 
Long. 64 millim. 
Hab. Panama, Bugaba (Champion). 
Very closely allied to 8. scabripennis, but with a longer hind body, and this part 
more indistinctly margined, and much more sparingly punctured. The structure of 
the legs in the male is similar to that of 8. scabripennis, but the abdominal characters 
are much less evident, there being only a slight deplanation of the penultimate ventral 
segment and that preceding it; the terminal segment has a rather large simple 
excision. Unique. 
24. Stenus densipennis. 
Niger, minus nitidus; antennis, palpis pedibusque testaceis, illarum clava fuscescente; prothorace elytrisque 
densissime punctatis, illo minus elongato, rugoso, his vix rugosis; abdomine crebre fortiterque punctato, 
tenuiter albido-pubescente. 
Long. 4-4} millim. 
Hab. Panama, David in Chiriqui (Champion). 
Readily distinguished from the variety of S. scabripennis found at Bugaba by the 
denser and less coarse sculpture of the thorax and elytra, and by the former being 
shorter in length. The male has a slight impression on the penultimate ventral plate, 
and a very slight depression on the hind margin of that preceding it; the terminal 
segment has a rather small excision ; the mucro on the inner margin of the hind tibia 
is placed very near to the extremity. Two examples. 
25. Stenus ornativentris. 
Niger, minus nitidus ; antennis, palpis pedibusque testaceis, femoribus posterioribus extrorsum fuscescentibus ; 
prothorace elytrisque densissime punctatis, illo minus elongato; abdomine dense fortiterque punctato, 
evidenter albido-pubescente. 
Long. 5 millim. 
Hab. Panama, San Miguel in the Pearl Islands (Champion). 
Tam not sure that this insect will prove to be specifically distinct from S. densi- 
pennis, but the sculpture of the thorax and elytra appears even more dense, and the 
