Smithsonian miscellaneous collections . n 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 lo
Smithsonian miscellaneous collections . n 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 intersegmentalmembrane in the vicinity of the pronotal lobes. They usually lie in the. 2^.—Intrafamily variation in the form and structure of theprosternal area (continued from fig. 22). A, Astcmis discopunctatus (Say). B, Pinofhilus parvipcnnis Csy. C, Lorinotacingulata (Lee.). D, Xantholinus picipennis Lee. unsclerotized membrane as in Lithocharis (fig. 22 B) and Trigonurus(fig. 22 D), but are incorporated into the posterior lobe of the pro-sternum in Pinophilus (fig. 23 B). In Aleochara (fig. 22 A) they aresurrounded by the small peritremes, while in Lorinota (fig. 23 C) thesesclerites are so large as completely to close the coxal cavities shape of the elytron is almost as individual as that of thepronotum (fig. 24). It is impossible to classify these organs by form, yO SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94
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