A.Sklyarenko: [  ]The name Tapirov comes from tapir (any of several large, stout, three-toed ungulates of the family Tapiridae). In his poem Vesyolyi zov vesenney zeleni… ("The merry call of the vernal green…" 1911) Bryusov mentions a tapir’s heavy gait and the light trepidations of dragon-flies[  ] Libellula being the Latin name of dragon-fly, “libelulla wings” on which Ada was circling above Van seems to hint at lyogkiy trepet strekoz (the light trepidations of dragon-flies) in Bryusov’s poem[  ] In his devastating essay on Bryusov (in "The Silhouettes of Russian Writers") Yuli Ayhenvald quotes the same lines from Bryusov’s poem and points out that this tapir, artificially brought from such a distant land for the rhyme's sake alone, tramples down the whole poem [   ]According to Van, poor mad Aqua’s “real destination was Terra the Fair and thither she trusted she would fly on libellula long wings when she died. Her poor little letters from the homes of madness to her husband were sometimes signed: Madame Shchemyashchikh-Zvukov ('Heart rending-Sounds').” (1.3) [and more]

Jansy Mello: Libellula wings also indicates a monoplane, Santos Dumont’s “Demoiselle”  SD was the creator of the wrist-watch, a curiosity V.Nabokov was aware of - since he mentions it either in ADA or in PF (a “Dumont” watch).  

L'élégant Demoiselle (libellule ou dragonfly en anglais) conçu par Alberto Santos-Dumont (1873-1932) peut être considéré comme le vrai ancêtre de tous les avions ultra légers. Ce pilote, de naissance brésilienne et dandy parisien du temps de son séjour en Europe avait connu la renommée avec ses vols en ballons et dirigeables avant de se tourner vers la conception d'engins plus lourds que l'air. http://jn.passieux.free.fr/html/Santos_Dmlle.php

See also: https://pt.wikipedia.org/wiki/Santos-Dumont_Demoiselle  and https://en.wikipedia.org/wiki/Santos-Dumont_Demoiselle

The Santos-Dumont Demoiselle ("Damselfly" or "Damsel") was a series of aircraft built in France by Brazilian aviation pioneer Alberto Santos-Dumont. They were light-weight monoplanes with a wire-braced wing mounted above an open-framework fuselage built from bamboo. The pilot's seat was below the wing and between the main wheels of the undercarriage. The rear end of the boom carried a tailwheel and a cruciform tail.