Micridium angulicolle ( Fairmaire, 1858 )

Darby, Michael, 2017, Taxonomic review of the genera Micridium Motschulsky, 1869 and Micridina Johnson, 1969 (Coleoptera: Ptiliidae) with eleven new species including the first records from South America and Madagascar, Zootaxa 4242 (2), pp. 233-254 : 237

Micridium angulicolle ( Fairmaire, 1858) as Ptilium angulicolle

( Figs. 1 , 29 )

Habitus Fig. 1 . Length 0.52 mm. Colour: dark yellowish brown, antennae and legs yellow, elytra transluscent. Antonnomeres 3–11 length 0.19 mm. Width across eyes 0.16 mm. Pronotum length. 0.13 mm, width 0.18 mm, widest in anterior half, strongly punctured and pubescent, and without distinct linear depressions, lateral margins sinuate behind middle, Fig. 29 . Elytra length, 0.33 mm, width 0.22 mm, sides evenly rounded, widest at middle, less strongly punctured and pubescent than the pronotum, shining. Wings visible through the elytra.

Remarks. The description, figure and measurements are based on the syntype in BMNH. This is mounted on a small piece of clear mica(?) attached to a card with the rear corners cut off. Labels are present as follows: ' angulicolle Brisout 1866 ' (in Matthews' hand, back corners also cut off); ' angulicolle Type from M. Brisout de Barneville France 1866' (in Matthews' hand on blue card with the rear corners cut off); '2239' (Matthews/Mason collection number); ' Matthews coll. 1904 - 120' ( BMNH accession number) and 'Syntype' (added by BMNH). ( Fig. 1 ).

Details of the ventrum, viewed through the mount, were not sufficiently clear to enable positive determination to Micridium and for the reasons given above no attempt was made to detach the insect or to dissect it so that the sex is not known.

Figures

FIGURES 1 – 14. Micridium habitus. 1. M. angulicolle (Fairmaire) 2. M. halidaii (Matthews) 3. M. vittatum Motschulsky 4. M. lineatum Le Conte 5. M. rhodeanum (Casey) 6. M. hilli (Johnson) 7. M. johnsoni sp. n. 8. M. elegans sp. n. 9. M. oweni sp. n. 10. M. attenboroughi sp. n. 11. M. boliviense sp. n. 12. M. newtoni sp. n. 13. M. foveatum sp. n. 14. M. thayerae sp. n. 15. M. proprium sp. n. 16. M. quadridens sp. n.

FIGURES 17 – 32. Micridium pronotums. 17. M. quadridens sp. n. x 605. 18. M. inornatum sp. n. x 590. 19. M. boliviense sp. n. x 625. 20. M. newtoni sp. n. x 695. 21. M. foveatum sp. n. x 830. 22. M. johnsoni sp. n. x 790. 23. M. elegans sp. n. x 810. 24. M. thayerae sp. n. x 650. 25. M. halidaii (Matthews) x 770. 26. M. hilli (Johnson) x 740. 27. M. oweni sp. n. x 575. 28. M. attenboroughi sp. n. x 675. 29. M. angulicolle (Fairmaire). 30. M. rhodeanum (Casey) 31. M. vittatum Motschulsky 32. M. lineatum Le Conte.