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Figures 1–2.Semiardistomis labialis (Chaudoir). 1 Dorsal aspect 2 Ventral aspect. Legend: a1 a2 a3 antennomeres 1–3, respectively. Scale bar 1 mm.
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Figures 3–5.3–4 Labrum (dorsal aspect) 3 Semiardistomis glabratus (Putzeys) 4 Semiardistomis labialis (Chaudoir) 5 RightMaxilla (dorsal aspect) of Semiardistomis labialis (Chaudoir). Legend : Labrum: ds dorsal seta es epipharyngeal seta lp labral dentiform projection. Maxilla: c cardo g1 galeomere 1 g2 galeomere 2 lac lacinia mp2 mp3 mp4 maxillary palpomeres 2–4 respectively pf palpifer s stipes. Scale bar 0.1 mm.
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Figures 6–12.Mandibles ofArdistomina, Clivinina and Dyschiriina with length/width ratios: A left, dorsal aspect B right, dorsal aspect C left, ventral aspect and D right, ventral aspect) 6 Semiardistomis labialis (Chaudoir) 7 Ardistomis fasciolatus Putzeys 8 Aspidoglossa mexicana (Chaudoir) 9 Oxydrepanus rufus (Putzeys) 10 Clivina dentipes Dejean 11 Schizogenius arimao Darlington 12 Dyschiriodes larochellei Bousquet. Legend: Occlusal teeth: m molar pm premolar rt retinacular tt terebral. Ventral surface: vg ventral groove mt microtrichia. Scale bar 0.1 mm.
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Figures 13–21.Labium ofClivinini (ventral aspects): A mentum and palpi B ligula C mental carina, lateral aspect. 13–14 Genus Semiardistomis: 13 S. glabratus (Putzeys) 14 Semiardistomis labialis (Chaudoir) 15 Ardistomis fasciolatus Putzeys 16 Aspidoglossa mexicana (Chaudoir) 17 Clivina dentipes Dejean 18 Oxydrepanus rufus (Putzeys) 19 Schizogenius arimao Darlington 20 Ancus excavaticeps (Putzeys) 21 Nyctosyles planicollis (Reiche). Legend: as apical setae of glossal sclerite gs glossal sclerite lp2 labial palpomere 2 lp3 labial palpomere 3 ll lateral lobes mc median carina m mentum mt mental tooth pas preapical seta of glossal sclerite pg paraglossa. Scale bar 0.1 mm.
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Figures 22–24.22 Body extremity (lateral aspect) of Semiardistomis labialis (Chaudoir) 23–24 Protarsus (ventral aspect) of Semiardistomis 23 Semiardistomis labialis (Chaudoir) 24 Semiardistomis glabratus (Putzeys). Legend: app abdominal epipleural projectionof abdominal sternum VII ep elytral plica. Scale bar 1 mm.
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Figures 25–26.Male genitalia of genus Semiardistomis: A phallus and parameres in dorsal aspect B phallus and endophallus everted in lateral aspect 25 Semiardistomis labialis (Chaudoir) 26 Semiardistomis glabratus (Putzeys). Legend: ba basal apophysis bo basal opening bp basal projection bs basal sclerite ll left lobe rl right lobe. Scale bar 0.1 mm.
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Figures 27–30.Female genitalia (ventral aspect). of Ardistomina 27 Semiardistomis glabratus (Putzeys) 28 Semiardistomis labialis (Chaudoir) 29 Ardistomis fasciolatus Putzeys 30 Aspidoglossa mexicana (Chaudoir). Legend: bc bursa copulatrix gc gonocoxa (gonocoxite 1 and 2, fused) lt laterotergite mt mediotergite sp spermatheca spd spermathecal duct spg spermathecal gland spgd spermathecal gland duct.Scale bar 0.1 mm.
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Figure 59.Distribution map of members of the labialis species–group in Central America.
