420 STAPH YLINID. 
Antenne rather stout, with the penultimate joints transverse. Head very deep 
shining black, broadly and deeply impressed along the middle in front, with numerous 
coarse large punctures, which, however, do not extend to the central space. Thorax 
brighter red than the rest of the surface, oblong, straight at the sides, and scarcely 
narrowed behind, the discoidal punctures rather large, and with four or five other 
punctures on each side. Elytra very sparsely punctate, as is also the hind body ; both 
are of a tawny red colour, the two terminal segments of the latter and the armature 
deep black. 
This species resembles the species of the Belonuchus formosus group, but has a red 
thorax, and is best placed near P. trochanterinus. The front femora are spinose in both 
sexes; the male, in addition to the characters mentioned above, has a rather peculiar 
structure of the terminal styles, which are rather broader, and furnished across the 
middle of the underside with a series of coarse sete. 
Only two examples are known, a small and very fragmentary male and a female. 
64. Philonthus xanthopus. 
Belonuchus xanthopus, Solsky, Hor. Soc. Ross. v. p. 139°. 
Mas. Mandibulis extus ad basin oblique dilatatis, femoribus anterioribus ultra medium longius spinosis, 
segmento ultimo ventrali parum conspicue sinuato-emarginato. 
Hab. Mexico! (Truqui, Flohr), Jalapa, Oaxaca (Hoge), Guanajuato (Sallé). 
Although the male of this insect was unknown to Solsky, and it is not a Belonuchus, 
I have little doubt in identifying it as his species; it is, at any rate, the only one known 
to me to which his description can apply. 
65. Philonthus celatus. 
Niger, nitidus ; elytris rufis, pedibus piceis, tarsis rufescentibus ; elytris abdomineque parce punctatis. 
Long. 9-11 millim. 
Mas. Mandibulis extus ad basin oblique dilatatis, femoribus anterioribus ultra medium Jongius spinosis, 
segmento ultimo ventrali sinuato-emarginato. 
Hab. Mexico, Mirador, Oaxaca, Tehuacan (Hoge), Yolos, Cuernavaca (Sal/é). 
Head and thorax very black and shining; the former impressed on the middle in 
front, and with numerous coarse punctures at the sides; the latter oblong, slightly 
narrowed behind. Antenne but little thickened externally, the penultimate joint as long 
as broad. Scutellum closely and coarsely punctate. Elytra shining, red, only sparingly 
and not coarsely punctured. Hind body intense black, shining, only sparsely punctate. 
This is distinguished from P. xanthopus almost solely by the dark colour of the 
legs. The sexual characters are the same in these species as they are in P. zanthomelas 
and P. basiventris. 
