Smithsonian miscellaneous collections . ingularis Mann. G, Lithocharis ochracea (Grav.). H, Stilicus angularisEr. I, Astenus discopunctatus (Say). ], Pinophiliis parvipennis Csy. K, Trachy-sectus confluentus (Say). L, Lathrotropis jacobina (Lee.). M, Osorius mundusShp. N, Tachinus limbatits Mels. O, Platystethns americanus Er. Osorius (fig. 14 M) and Platystethns (fig. 14 O), is definite andusable, as well as the entirely glabrous character of Stenus (fig. 14 A).The variation in the form and structure of the mandibles is ex-tremely great. Every gradation is found between massive blunt typeswit
Smithsonian miscellaneous collections . ingularis Mann. G, Lithocharis ochracea (Grav.). H, Stilicus angularisEr. I, Astenus discopunctatus (Say). ], Pinophiliis parvipennis Csy. K, Trachy-sectus confluentus (Say). L, Lathrotropis jacobina (Lee.). M, Osorius mundusShp. N, Tachinus limbatits Mels. O, Platystethns americanus Er. Osorius (fig. 14 M) and Platystethns (fig. 14 O), is definite andusable, as well as the entirely glabrous character of Stenus (fig. 14 A).The variation in the form and structure of the mandibles is ex-tremely great. Every gradation is found between massive blunt typeswith a large molar area, such as Micropeplus (fig. 15 C), and the veryslender acute type without mola, such as Astenus (fig. 15 L). In somethe terminal tooth is the only one present, as in some species of Geo- NO. 13 STAPH YLINIDAE BLACKWELDER 59 dromicus, Pelecomalium (fig. 16 A), Tanyrhhms, Lathrimacum, Pro-teinus (fig. 15 A), Trigonurus, Osoriiis, Tachyporns, Bolitobius ( H), Xenodusa (fig. 15 D), and Lorinota. In others from two. Fig. 15.—Intrafamily variations of the mandibles (continued on fig. 16). A, Proteinus linibatiis Makl. B, Phloeocharis siibtilissiina Mann. C, Micro-pephis piinctatus Lee. D, Xenodusa sharpi Wasm. E, Lcptochirns mexicamis , Aplodcrits linearis Lee. G, Oligota csmeraldae Csy. H, Bolitobius cinctns(Grav.). L Pseudopsis obliterata Lee. J, Liparoccphahts brcvipennis , Glenus flohri Shp. L, Astcnns discopiinctatns (.Say). to many teeth may be produced, placed either near the tip or at anypoint along the inner face. One species, Oxyporus (fig. 16 H),has a very small isolated tooth near the outer margin of the mandible 6o SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94 at the middle. The condyles are fairly constant in position. The ven-tral one is a rounded protuberance and is located on the proximalend of the ventral side near the outer angle. In Oxyporus (fig. 16 H)this condyle is situated much nearer the inner edge. The dorsal ar-ticulat
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