STAPHYLINID A. 801 
APOCELLUS (p. 694). 
1(4). Apocellus mestus. 
Angustulus, niger, capite prothoraceque piceis, antennarum basi, palpis pedibusque testaceis, femoribus ex- 
trorsum fuscis; prothorace subgloboso, marginibus punctulatis ; elytris parce punctatis. 
Long. 4 millim. 
Hab. Mexico, near the city, Huitzo (Hoge). 
Antenne stout, not very long, joints 5-10 transverse. Head narrow. Thorax convex, 
between quadrate and globose.in form, with a vague feeble punctuation, closer near the 
sides and basal margin. Elytra slender, longer than the thorax ; blackish, more dilute 
at the shoulders; hind margin and posterior part of the suture bearing a few distant 
fine punctures. Hind body entirely black, extremely finely punctate. 
This insect is similar to the smallest and darkest examples of A. sphericollis, but may 
be readily distinguished by the shorter thick antenne and the existence of a feeble 
punctuation on the thorax and elytra. The male characters are similar to those of 
A. sphericollis. The twelve examples before me agree satisfactorily, except that the 
unique individual from Huitzo is rather larger and has a less distinct sculpture. 
Apocellus analis (p. 695). 
To the Mexican locality given, add :—near the city, Huitzo (Hoge). 
I have as yet only seen two examples from our region that I can refer with certainty 
to this species; the examples now received from Huitzo appear to be intermediate 
between A. analis and A. cognatus, and may possibly be a third species; but I fail, on 
the very imperfect material before me, to find any satisfactory distinctions for the three 
forms other than the peculiar sexual structures of the male, and it is possible these 
may be liable to grades of development, though such a gradation does not appear to 
occur in the common A. sphericollis. A. brevipennis, Casey, is another species very 
closely allied to A. analis, the chief distinctions being in the male characters ; it is 
found in Texas and Arizona, but has not yet occurred within our limits. 
TROGOPHLQUS (p. 697). 
1(4). Trogophleus argutus. 
Latus, parum elongatus, subdepressus, niger, geniculis tarsisque flavescentibus ; prothorace elytrisque crebre 
sat fortiter punctatis, sat nitidis, illo medio sat profunde bi-impresso. 
Long. 3 millim. 
Hab. Mexico, near the city (/Hége). 
Antenne rather slender, thicker externally, the penultimate joint rather longer than 
broad. Head much narrower than the elytra; antennal tubercles strongly elevated. 
BIOL. CENTR.-AMER., Coleopt., Vol. I. Pt. 2, November 1887. 5 KK 
