Xestipyge

Warner, William B., 2021, A brief review of the New World Xestipyge Marseul (Coleoptera: Histeridae: Dendrophilinae: Paromalini) with description of a new species from the southwestern USA, Insecta Mundi 2021 (854), pp. 1-12 : 2

Key to the New World Xestipyge

1. Elytron with dorsal intervals with 1 or more pseudostriae in about apical half or more ( Fig. 6–9 ); mostly neotropical.......................................................................... 2

— Elytron dorsal intervals lacking pseudostriae, but may have strong aciculations beginning in punctures at base of elytral apical declivity and extending apically down declivity (e.g., Fig. 1–5 ); mostly Nearctic.................................................................................. 3

2. Elytron with pseudostriae on dorsal intervals in the form of 1 or 2 straight and mostly continuous channels that may break up basally into punctures or coalescent groups of punctures ( Fig. 9 ); male with parameres widest at about apical tenth ( Fig. 16 ); Mexico and Central America in Atta Fabricius ant nest detritus..................................................... X. multistriatum (Lewis)

— Elytron with pseudostriae on dorsal intervals formed by discontinuous and undulating vermiform segments ( Fig. 7 ); male with parameres widest at about apical third ( Fig. 15 ); Mexico to Brazil................................................................ X. garbigliettii Marseul

3. East of Rocky Mountains; elytron with sutural stria usually effaced in basal quarter or third, outer subhumeral stria usually obsolescent or lacking and inner subhumeral stria noticeably weaker than dorsal striae and usually effaced in basal quarter or more; female pygidium various, but often with weak impression to incised chevron in apical half of disc; male with tegmen less elongate ( Fig. 17, 19 )................................................................................. 4

— West of Rocky Mountains (Arizona, California) ; elytron with sutural stria usually complete to arch with 4 th dorsal stria (occasionally narrowly broken or continued by irregular punctures at base), inner subhumeral stria usually about as coarse and complete as dorsal striae (may be weaker or effaced briefly over humeral umbone), outer subhumeral stria usually distinct at least in middle section; female pygidium convex, lacking any indication incised chevron or shallow depression on apical half of disc; male tegmen very elongate ( Fig. 18 )................... X. skelleyi Warner , new species

4. Metasternum lateral to lateral stria usually with scattered punctures (some may be subcontiguous) mostly separated by half or more of their own diameters; elytron with dorsal intervals usually flat to slightly convex, behind sutural strial arch mostly lacking coarse punctures anterior to apical quarter or so ( Fig. 4 ); female pygidium usually with distinct incised chevron in apical half ( Fig. 3 ); male with parameres triangularly expanded near apex ( Fig. 17 )...................... X. conjunctum (Say)

— Metasternum lateral to lateral stria usually more coarsely and densely punctate, with most punctures contiguous to separated by less than half their own diameters; elytron with dorsal intervals usually slightly concave (best viewed at oblique angle, Fig. 2 , 5 ), behind sutural strial arch usually with

Figures

Figures 6–7. Xestipyge garbigliettii, Durango, Mexico. 6) Dorsal habitus. 7) Close-up of elytral sculpture.

Figures 8–9. Xestipyge multistriatum, Veracruz, Mexico. 8) Dorsal habitus. 9) Close-up of elytral sculpture.

Figures 1–2. Dorsal habitus of Xestipyge species. 1) X. conjunctum, SC, USA. 2) X. geminatum, NC, USA.

Figures 3–5. Xestipyge species. 3) X. conjunctum, SC, USA, female pygidium. 4) X. conjunctum, right elytron. 5) X. geminatum, NC, USA, right elytron.

Figures 15–19. Xestipyge species tegmena, dorsal view. 15) X. garbigliettii, Durango, Mexico. 16) X. multistriatum, Veracruz, Mexico. 17) X. conjunctum, SC, USA. 18) X. skelleyi, holotype. 19) X. geminatum, NC, USA.