Smithsonian miscellaneous collections . diis Shp. E, Liparocephalus brevipennis , Gcodroiniciis hrumwus (Say). G, Hypocyptus longicornis (Payk.). H,ApJodcrus linearis Lee. obscured by the reduction of sclerites and the obliteration of sutures,but several important characters are available. The amount of inflection of the pronotum varies somewhat, butthe size of the postcoxal lobe is more important and usable. Theselobes tend to close the coxal cavities behind, being almost successfulin Leptochints (fig. 22 F). In Lithocharis (fig. 22 B) and Xantholinus(fig. 23 D) they are lacking entirel
Smithsonian miscellaneous collections . diis Shp. E, Liparocephalus brevipennis , Gcodroiniciis hrumwus (Say). G, Hypocyptus longicornis (Payk.). H,ApJodcrus linearis Lee. obscured by the reduction of sclerites and the obliteration of sutures,but several important characters are available. The amount of inflection of the pronotum varies somewhat, butthe size of the postcoxal lobe is more important and usable. Theselobes tend to close the coxal cavities behind, being almost successfulin Leptochints (fig. 22 F). In Lithocharis (fig. 22 B) and Xantholinus(fig. 23 D) they are lacking entirely. The sternum varies greatly in length. The longest exposed areaoccurs in Leptochints (fig. 22 F), but the large posterior lobe of 68 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94 Astenus (fig. 23 A) surpasses it somewhat though covered by thecoxae. Aleochara (fig. 22 A) has the shortest and most reducedstenium. This structure is often produced posteriorly between orunder the coxae. Trigonnrus (fig. 22 Id) has a very small projection,. Fig. 22.—Intrafamily variation in the form and structure of theprosternal area (continued on fig. 23). A, Aleochara lata Grav. B, Lithocharis ochracca (Grav.). C, Osornis mundusShp. D, Triganurus crotchi Lee. E, Bledius monstratus Csy. F, Leptochirusmexicanus Er. while the extreme development is reached in Astenus (fig. 23 A) andPinophilus (fig. 23 B). In these last two the prosternal lobe reachesthe lobes of the inflexed pronotum, thereby closing the coxal cavitiesbehind. In Pinophilus this closure is completed by the actual fusionof the sternal lobe to the underside of the lateral lobes. NO. 13 STAPH YLINIDAE BLACK WELDER 69 In Xantholinus (fig. 23 D) and Metopoucus there is a pair of largetriangular sclerites anterior to the sternum and lying free in the edgeof the anterior foramen. They occur in no other group and are saidto be present in only a few genera of the Xantholinini. The spiracles of the mesothorax normally lie in the intersegmen
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