734 STAPHYLINIDA. 
allies of L. scoriaceus, Germ., forming a very difficult and intricate study; the peculiar 
mandibles have hitherto been neglected, but their structure evidently offers specific 
differences, though the appreciation of them is rendered difficult by the existence of 
individuals of imperfect development, as in the analogous case of the family Lucanide. 
In Leptochirus I have not detected a sexual difference in the mandibular structure. The 
upper edges of the mandibles always have an erect tooth or horn, which I shall speak 
of as the “dens superior.” The inner edges of the mandibles bear several teeth, those 
nearest the extremity being always acuminate, these I call “dentes tenaces;” while 
nearer the base there are more obtuse teeth, or a prominence of large size and irregular 
form, which I name “ dens molaris ;”’ the apical teeth are much more constant in their 
shape and position than those nearer the base. In the L. mexicanus group of species 
the upper edge of the mandible bears a tooth or tubercle nearer to the base than the 
superior tooth, and which I therefore call “ dens supero-basalis.” 
§1. Mandibule superne dente superiore unico munite. 
A. Spatio frontali abrupte diviso, parte anteriore perpendiculari, 
parte posteriore horizontalt. 
1. Leptochirus maxillosus. 
Cucujus mazillosus, Fabr. Syst. Eleuth. i. p. 93°. 
Leptochirus mazillosus, Kr. Gen. et Spec. Staph. p. 825°; Fauv. Bull. Soc. Linn. Normand. ix. 
p. 18, t.1. f. 2°; Notices ent. ii. p. 15, t. 1. f. 2%. 
Hab. Mexico, Teapa**; Brivish Honpuras, R. Sarstoon, Belize (Blancaneaun) ; 
Nicaracua, Chontales (Janson).—Soutn AmeErica!??4, Colombia to Rio Janeiro. 
This species I have not been able to verify as Mexican ; the examples named Z. mazil- 
losus in Sallé’s collection were L. proteus and L. extimus. 
2. Leptochirus brunneo-niger. | 
Leptochirus brunneo-niger, Perty, Del. Anim. Art. Brasil. p. 382, t. 7. f. 7°; Fauv. Bull. Soc. Linn. 
Normand. ix. p. 17*; Notices ent. ii. p. 13°. 
Leptochirus cayennensis, Lap. Etud. ent. i. p. 125, t. 4. f. 5%. 
Leptochirus mazillosus, var. a, Er. Gen. et Spec. Staph. p. 825°. 
Hab. Mexico (coll. Chevrolat ?*)—Sourn America to Brazil!?345, 
Additional evidence is required before this insect can be regarded as a native of 
our region. I have seen only one individual reputed to have been thence obtained—a 
very old example in Chevrolat’s collection ; it is probable that Fauvel’s 2% record of the 
species as Mexican depends on this example, and if so, I think it untrustworthy. 
Though common in South America, there is no other evidence as yet of the occurrence of 
L. brunneo-niger further north than Peru or Guiana. 
