Smithsonian miscellaneous collections . sects. Of the species studied,only Tachyporus (fig. 10 C), Tachinus, and Erchomus (all in thetribe Tachyporini) show any trace of the anterior part of the coronalsuture. A few species have a very short part of the suture visibleat the posterior margin of the epicranium. These include Psendopsis,Paedcrus, Lathrotropis, Lithocharis, Trachysectus, Pinophiliis, Xan-fholinns, Staphylinns, Philonthus, Cafius, Glenus, Acylophorus (fig.II G), Quedms, Bolitohius (fig. 11 F), and Xenodusa. The frontal sutures are complete between the anterior tentorial pitsin all

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Smithsonian miscellaneous collections . sects. Of the species studied, only Tachyporus (fig. 10 C), Tachinus, and Erchomus (all in thetribe Tachyporini) show any trace of the anterior part of the coronalsuture. A few species have a very short part of the suture visibleat the posterior margin of the epicranium. These include Psendopsis, Paedcrus, Lathrotropis, Lithocharis, Trachysectus, Pinophiliis, Xan-fholinns, Staphylinns, Philonthus, Cafius, Glenus, Acylophorus (fig.II G), Quedms, Bolitohius (fig. 11 F), and Xenodusa. The frontal sutures are complete between the anterior tentorial pitsin all the Tachyporinae studied except Hypocyptus (fig. 10 D) as wellas the Habrocerinae and Oxyporinae. They were also found in thiscondition in certain Oxytelini and Piestini. The following are noted 50 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94 in this group: Trigonurus (fig. lo A), Bledms, Aploderus, Oxyporus(fig. II D), Hahroccrus, Tachyporus (fig. loC), Tachinns, Ercho-mus, and BoUtohnts (fig. ii F). However, in none of these species. Fig. 10.—Intrafamily variation in the form and structure ofthe dorsal aspect of the head (continued on fig. 11).A, Truionunis crotchi Lee. B, Mlcropcplus punctatus Lee. C, Tachyporusjocosns Say. D, Hypocyptus Jongicorms (Payk.). E, Leptochirus me.vicanusEr. F, Aleochara lata Grav. G, Platystcthus aviericanus Er. H, Stciiits sculp-tilis Csy. I, Protcinus limbafiis Miikl. J, Pclccomaimm tcstaceiun (Mann.). K, Xenodiisa sJiarpi Wasm. h. Lori)wta cingulata (Lee). is there any evidence of the presence, as a sclerite, of the frons.This sclerite is normally bounded laterally and posteriorly by thefrontal sutures and anteriorly by the frontoclypeal or epistomal su- NO. 13 STAPH YLINIDAE BLACK WELDER 51 ture, or, if this suture is absent, approximately by a line drawn be-tween the anterior tentorial pits. Since in these forms the frontalsutures unite to form a nearly straight line, it is obvious that the true