Tychus minor, (LeConte)

Chandler, Donald S. & Geromini, Sarah D., 1962, A Revision of the Eastern Nearctic GenusCustotychusPark and Wagner, 1962 (Coleoptera: Staphylinidae: Pselaphinae), The Coleopterists Bulletin 1962 (2), pp. 217-242 : 217-242

10. Metasternal tubercle at midpoint to 2/3 point of metasternal length, in posterior view slightly expanded at apex, apex width about half that of stem length ( Fig. 26b ); lateral arms of dorsal plate in lateral view with 2 large, slightly recurved spurs, in addition to small apical striated spine that is directed more mesally ( Fig. 13 ); Pennsylvania to Georgia and Texas, only one record east of crest of Appalachian Mountains ( Fig. 35 ) ......................... 12. C. minor (LeConte)

10′. Metasternal tubercle either preapical ( C. natchez ) or usually slightly posterior

11) C. carloritaorum ; 12) C. leei ; 13) C. minor ; 14) C. natchez ; 15) C. pocahontas . Scale bar = 0.1 mm.

to middle of metasternum; lateral arms of dorsal plate variable, lacking 2 similar recurved teeth on lateral arms of dorsal plate, with single or no ventral teeth ( Figs. 2 , 14, 15 ) ....................................................................... 11 11. Metasternal tubercle preapical, close to but not at metasternal apex ( Fig. 27b ); median lobe of genitalia elongate, lateral margins parallel for most of length, lateral arms with large ventrally recurved tooth at apex

Figures

Figs. 16–27. Custotychus species, scanning electron micrographs right lateral (a) and posterior (b) views of metasternal tubercle. 16) C. chickasaw; 17) C. daggyi; 18) C. lobatus; 19) C. turnbowi; 20) C. rothorum; 21) C. spinosus; 22) C. verticalis; 23) C. watrousi; 24) C. carloritaorum; 25) C. leei; 26) C. minor; 27) C. natchez. Grid for measurements of 20 or 50m at bottom of micrographs.

Figs. 8–15. Custotychus species, dorsal and left lateral view of aedeagus. 8) C. cavei; 9) C. verticalis; 10) C. watrousi;

Figs. 34–36. Distribution of Custotychus species. 34) Distribution of species in the spinosus and verticalis species-groups: C. rothorum and C. spinosus, and C. cavei, C. verticalis, and C. watrousi; 35) Distribution of C. minor; 36) Distribution of other species in the minor species-group: C. carloritaorum, C. leei, C. natchez, and C. pocahontas.

Figs. 1–7. Custotychus species. 1) C. natchez, dorsal habitus; 2–7) Aedeagus, dorsal and left lateral views: