788 SUPPLEMENT. 
Philonthus incertus (p. 416). 
Philonthus gracilicornis, Horn, Trans. Am. Ent. Soc. xi. p. 190°. 
Before the locality given, insert: —Norra America, Arizona ! (Horn). 
56 (a). Philonthus iteratus. 
Rufo-testaceus, capite, prothorace abdomineque ad apicem nigris; antennis basi nigro, extrorsum ferrugineis ; 
prothorace serie dorsali interdum 6-punctato. 
Mas capite majore, mandibulis extus ad basin oblique dilatatis, femoribus anterioribus subtus in medio spinosis. 
Long. 10-12 millim. 
Hab. Mexico, Villa Lerdo in Durango (Hége). 
Resembles almost exactly the larger examples of Belonuchus formosus, but rather 
larger, and with different sexual characters; also similar to P. trochanterinus and 
P. zunilensis, but with the trochanters simple and the mandibles of the male dilated. 
P. iteratus is most nearly allied to P. wanthomelas, from which it differs in the colour 
of the breast, coxee, antenne, and palpi; and, moreover, has the basal joint of the hind 
tarsus considerably longer. Herr Hoge met with a good series of this species, and no 
variation beyond that of the sexual characters is to be seen in it. I may mention that 
in addition to the characters I have previously pointed out to distinguish the males of 
this intricate group of species there exists another, viz. that in Belonuchus formosus the 
male mandibles have a simple tooth internally, while in P. canthomelas and P. iteratus 
this is replaced by an elongate slightly emarginate incrassation. 
84 (a). Philonthus heteropus. 
Elongatus, subparallelus, niger, capite, prothorace elytrisque vix subznescentibus; prothorace serie dorsali 
multipunctato, punctis fere grossis; tarsis posterioribus brevibus, articulo basali crasso, brevi, quam 
articulus terminalis breviore. 
Long. 93 millim. 
Hab. Mexico, near the city (Hoge). 
Antenne black, moderately stout, the penultimate joint about as long as broad. Head 
with two large punctures on each side near the eye, and with numerous coarse punctures 
at the hind angles. Thorax subquadrate, very shining ; dorsal series of punctures rather 
irregular, consisting of six or seven very large impressions; outside the series there are 
five or six other punctures on each side, and a few near the front angles. Elytra longer 
than the thorax, closely and rather finely punctate. Hind body moderately closely and 
finely punctate. 
A single mutilated female is all we have received of this interesting species, remark- 
ably distinct on account of the short basal joint of the hind foot ; notwithstanding this 
latter character, I think it better placed in Philonthus than in Actobius. 
84 (s). Philonthus actocharis. 
Hlongatus, subdepressus, niger, femoribus sordide testaceis ; prothorace nigerrimo, sat crebre punctato, medio 
late levigato; elytris grisescentibus, fortiter sat crebre punctatis. 
Long. 9 millim. 
