Tracheliodes quinquenotatus (Jurine, 1807)

Divelec, Romain Le, 2022, A taxonomic review of the Tracheliodes quinquenotatus (Jurine, 1807) species complex and some new records of rare European Tracheliodes A. Morawitz, 1866 (Hymenoptera, Crabronidae), Zootaxa 5099 (2), pp. 244-260 : 245-246

Key of the Tracheliodes quinquenotatus species complex

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1 Inner mandibular margin with small convexity ( Fig. 4B ). Lateral teeth of clypeal free margin usually longer than median tooth ( Fig. 1A ). Clypeus with conspicuously curved spike-like process, its tip pointing upwards ( Figs 1A, 1D, 1G ). Dorsolateral angle of pronotal collar more protruding than in following species, distinctly acute and tooth-like ( Fig. 4H ). Prepectus uniformly finely and densely punctate over entire surface, in upper part also finely ridged ( Fig. 3A ). Basal area of propodeum narrow (at most 1.5 × as wide as crenulate groove preceding scutellum foremargin), shallowly impressed towards posterior margin (especially on its sides) so that there is no abrupt level change with remaining propodeum, inconspicuously sculptured and shiny between longitudinal carinae ( Fig. 3D )............................................ T. herinaceus ( Gribodo, 1894)

- Inner mandibular margin with tooth ( Fig. 4A ). Lateral teeth of clypeal free margin as long as or shorter than median tooth ( Figs 1 B-C). Clypeus with large rounded transverse process or small tooth ( Fig. 1 ), dorsal surface of process flat or convex, its tip pointing forwards. Dorsolateral angle of pronotal collar at most sharply angular ( Fig. 4G ). Prepectus with sparse coarse punctures, punctation sparser or absent anteriorly and ventrally ( Figs 3 B-C), dorsally with coarse ridges and without distinct punctures between ridges. Basal area of propodeum either wider or markedly impressed so that there is abrupt level change between its posterior margin and remaining propodeum ( Figs 3 E-F)............................................. 2

2 Lateral teeth of clypeal free margin remarkably wide and short (at least 1.8 × as wide as long) so that central tooth usually looks more protruding ( Fig. 1B ). Clypeus with large transverse rounded process, with convex side in dorsal view, its ventral and dorsal surfaces nearly flat ( Figs 1B, 1E, 1H ). Upper frons finely and sparsely punctate ( Fig. 4E ). Basal area of propodeum narrow (hardly wider than crenulate groove preceding scutellum foremargin), deeply impressed so that there is abrupt level change between its posterior margin and remaining propodeum, linear with posterior margin almost parallel to metanotum hindmargin, with short carinae delimiting deep smooth and shiny squared pits ( Fig. 3E ). Light spots whitish.................................................................................................. T. quinquenotatus ( Jurine, 1807)

- Lateral teeth of clypeal free margin longer, usually not distinctly wider than long (at most 1.5 × as wide as long) so that central tooth seems less protruding ( Fig. 1C ). Clypeus with small cone-shaped process (if reduced, clypeus regularly convex), its lateral side straight to concave in dorsal view, its ventral surface convex ( Fig 1C, 1F, 1I ). Upper frons coarsely punctate, punctation much denser on its sloping part ( Fig. 4F ). Basal area of propodeum wide (1.5-2.0 × as wide as crenulate groove preceding scutellum foremargin), shallowly impressed towards posterior margin so that level change with remaining propodeum is progressive, crescent shaped with poorly delimited posterior margin curved out toward middle, with long basal carinae delimiting elongate chagrined pits with fine irregular ridges coming from posterior margin ( Fig. 3F ). Light spots yellowish …......................................................................... T. trochantericus ( Herrich-Schaeffer, 1841)

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1 Inner mandibular margin with small convexity ( Fig. 4D ). Basomedian area of clypeus usually conspicuously produced in more or less acute or angular tubercle (if reduced, base of clypeus remarkedly angular in side view), its ventral surface nearly flat ( Figs 2A, 2D, 2G ). Prepectus uniformly finely and densely punctate over entire surface, in upper part also finely ridged (as in Fig. 3A ). Dorsolateral angle of pronotal collar more protruding, acute, elongate and tooth-like ( Figs 4J , 5A ). Basal area of propodeum slightly widened medially, at most 2 × as wide as crenulate groove preceding scutellum foremargin, shallowly impressed towards posterior margin so that there is no abrupt level change with remaining propodeum ( Fig. 3G )..................................................................................... T. herinaceus ( Gribodo, 1894)

- Inner mandibular margin with protruding tooth ( Fig. 4C ). Clypeus without protruding process, transition between horizontal basomedian area and vertical bevel convex or angular at most ( Fig. 2 ). Prepectus with sparse coarse punctures, punctation sparser or sometimes absent anteriorly and ventrally (as in Figs 3 B-C). Upper prepectus coarsely ridged, without noticeable punctures between ridges. Dorsolateral angle of pronotal collar at most rectangular ( Figs 4I , 7A ). Basal area of propodeum different, either wider or narrower and markedly impressed so that there is abrupt level change between its posterior margin and remaining propodeum ( Figs 3 H-I)........................................................................ 2

2 Lateral teeth of clypeus free margin wide and short (at least 1.8 × as wide as long) so that the central tooth usually looks more protruding ( Fig. 2B ). Clypeus conspicuously elevated, transition between horizontal basomedian area and vertical bevel sharp, appearing angulate ( Figs 2B, 2E, 2H ). Clypeal bevel triangular and flat, mesally longer than basomedian area ( Fig 2B ). Upper frons finely and sparsely punctate (as in Fig. 4E ). Basal area of propodeum narrow (hardly wider than crenulate groove preceding scutellum foremargin), deeply impressed so that there is an abrupt level change between its posterior margin and remaining propodeum, linear with posterior margin almost parallel to metanotum hindmargin, with short carina delimiting deep smooth and shiny squared pits ( Fig. 3H ). Light spots whitish................................ T. quinquenotatus ( Jurine, 1807)

- Lateral teeth of clypeus free margin narrower and longer (at most 1.5 × as wide as long) so that central tooth seems less protruding ( Fig. 2C ). Clypeus regularly convex on its whole surface, its declive basomedian area and bevel gradually changing into one in convexity around middle of clypeus ( Figs 2C, 2F, 2I ). Clypeal bevel almost linear, about as long as basomedian area in its middle ( Fig. 2C ), convex. Upper frons coarsely punctate, punctation much denser on its sloping part (as in Fig. 4F ). Basal area of propodeum wide (usually more than 2 × as wide as crenulate groove preceding scutellum foremargin), shallowly impressed towards posterior margin so that level change with remaining propodeum is progressive, crescent-shaped with its poorly delimited posterior margin curved out toward middle, with long basal carinae delimiting elongate chagrined pits with fine irregular ridges coming from posterior margin ( Fig. 3I ). Light spots variable, usually yellowish................................................................................................. T. trochantericus ( Herrich-Schaeffer, 1841)

Figures

FIGURE 1. Female clypeus. A-C—Clypeus in front view; D-F—Clypeal process in dorsal view; G-I—Clypeal process in lateral view; A, D, G—Tracheliodes herinaceus; B, E, H—Tracheliodes quinquenotatus; C, F, I—Tracheliodes trochantericus.

FIGURE 2. Male clypeus. A-C—Clypeus in front view; D-F—Clypeal process in dorsal view; G-I—Clypeal process in lateral view; A, D, G—Tracheliodes herinaceus; B, E, H—Tracheliodes quinquenotatus; C, F, I—Tracheliodes trochantericus.

FIGURE 3. A-C—Female prepectus; D-F—Metanotum and propodeum of females; G-I—Metanotum and propodeum of males; A, D, G—Tracheliodes herinaceus; B, E, H—Tracheliodes quinquenotatus; C, F, I—Tracheliodes trochantericus.

FIGURE 4. A-B—Female right mandibule; C-D—Male right mandibule; E-F—Female frons in dorsal view; G-H—Female pronotum; I-J—Male pronotum; A, C, E, G, I—Tracheliodes quinquenotatus; B, D, H, J—Tracheliodes herinaceus; F—Tracheliodes trochantericus.

FIGURE 5. Lectotype of Crabro (Blepharipus) herinaceus Gribodo. A—Habitus in dorsal view with labels; B—Habitus in profil; C—Face in front view. Black scale = 1mm.

FIGURE 7. Holotype of Crabro bucephalus Smith. A—Habitus in dorsal view with labels; B—Habitus in profil. Black scale = 1mm.