50 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94 



in this group: Trigonurus (fig. lo A), Bled'ms, Aploderus, Oxyporus 

 (fig. II D), Hahroccrus, Tachyporus (fig. loC), Tachinns, Ercho- 

 mus, and BoUtoh'nts (fig. ii F). However, in none of these species 



Fig. 10. — Intrafamily variation in the form and structure of 

 the dorsal aspect of the head (continued on fig. 11 ). 

 A, Tr'uionunis crotchi Lee. B, Mlcropcplus punctatus Lee. C, Tachyporus 

 jocosns Say. D, Hypocyptus Jongicorms (Payk.). E, Leptochirus me.vicanus 

 Er. 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 the 

 frontal sutures and anteriorly by the frontoclypeal or epistomal su- 



