Trichonaupactus densior Hustache, 1939

Río, M. Guadalupe Del & Lanteri, Analía A., 2018, New synonymies, new combinations and lectotype designations for weevils in the tribe Naupactini (Coleoptera: Curculionidae: Entiminae), Zootaxa 4500 (3), pp. 329-340 : 336

Trichonaupactus densior Hustache, 1939

Trichonaupactus densius Hustache, 1939: 46 (incorrect original spelling). Type material: lectotype female herein designated;

Argentina, La Pampa, General Pico, IV-1934, JM Bosq; MNHN, col. Hustache. Length: 12 mm. Trichonaupactus densius var. albescens Hustache, 1939: 47 (infrasubspecific rank). Trichonaupactus rexus Hustache, 1939: 47 . Type material: holotype female; Uruguay, Montevideo, J. Tremoleras; MNHN, col.

Hustache. Length: 15 mm (Fig. 21). New synonymy.

Geographic distribution: Argentina (Buenos Aires and La Pampa) and Uruguay (Montevideo) .

Remarks: We established the synonymy of the only two species of the genus Trichonaupactus Hustache, 1939 , T. densius (replaced by T. densior in Alonso-Zarazaga & Lyal 1999, because the original spelling was incorrect) and T. rexus , because we consider that the characters used to distinguish these species correspond to geographic variation. The only female of T. densior that bears the type label is herein designated as lectotype. There are paralectotypes with same data as the lectotype in the Hustache collection in MNHN (three females) and in MLP, Argentina (10 females and two males) (see Morrone & Loiácono, 1992). Moreover, in MNHN there is a female from Argentina, La Pampa. General Pico, IV-1934, JM Bosq, labeled as type of T. densius var. albescens . The material of this variety comes from the same locality as the type of T. densior , consequently this variety should be not treated as subspecific but as infrasubspecific.