Smithsonian miscellaneous collections . n the labial palpi. A, Aleochara lata Grav. B, Liparoccphahis brevipennis Makl. C, Stenussculptilis Csy. D, Oxyporus lateralis Grav. E, Habrocerus schzvarsi Horn. F,Hypocyptus longicornis (Payk.). G, Pinophilus parvipcnnis Csy. H, Trigo-nurus crotchi Lee. I, Paederus laetus Er. J, Osorius mundus Shp. A four-segmented labial palpus was found only in Aleochara ( A). The palpi of other Aleocharinae are said to be similar. THE THORAX A great deal of variation is exhibited in the shape of the pronotum(figs. 20, 21). It is hard to classify the types, as
Smithsonian miscellaneous collections . n the labial palpi. A, Aleochara lata Grav. B, Liparoccphahis brevipennis Makl. C, Stenussculptilis Csy. D, Oxyporus lateralis Grav. E, Habrocerus schzvarsi Horn. F,Hypocyptus longicornis (Payk.). G, Pinophilus parvipcnnis Csy. H, Trigo-nurus crotchi Lee. I, Paederus laetus Er. J, Osorius mundus Shp. A four-segmented labial palpus was found only in Aleochara ( A). The palpi of other Aleocharinae are said to be similar. THE THORAX A great deal of variation is exhibited in the shape of the pronotum(figs. 20, 21). It is hard to classify the types, as nearly all gradationsare to be found and nearly every genus or even species is somewhatdifferent from its near, as well as from its more distant, 20 and 21 show some of the forms that occur. Almost anv 66 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94. Fig. -Intrafamily variation of the pronotum (continued on fig. 21). A, Lathrofropis jacobiiia (Lee). B, Lithocharis ocliracea (Grav.). C, Ocypusater (Grav.). D, Fclecomaliiini tcstaceum (Mann.). E, Trigoiuirus crotchiLee. F, Pscudopsls oblitcrata Lee. G, Leptochirus inexicanus Er. H, Proteinuslimbatits Makl. L Platystcthus aiiicricamis Er. J, Stilicus angularis Er. K, Aleo-chara lata Grav. L, Acylophonis flavicoUis Sachse. M, Tachyporiis jocosiisSay. N, Micropeplus punctatus Lee. f! NO. 13 STAPH YLINIDAE BLACK WELDER (>7 of these may be found in any of the larger subfamiHes. It is obviousthat the shape of the pronotum cannot be used in the higher classifica-tion. In certain groups it is useful in generic and specific segregation. The inflexed portion of the pronotum is generally closely unitedwith certain elements of the ventral surface and will be discussed inthe section dealing with the prosternal area. The ventral aspect of the prothorax affords a considerable amountof variation
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