Acrocinus longimanus ( Linnaeus , 1758 ) ( Coleoptera , Cerambycidae ) : first record from the province of Corrientes , Argentina

The occurrence of Acrocinus longimanus (Linnaeus, 1758) in Corrientes, Argentina, is reported for the first time. This record extends the known distribution of this species to 300 km south from the nearest occurrence record in Argentina.

Adults are nocturnal; their activity can be observed from dusk until dawn.The larvae feed on wood, mainly on injured trees or those that have been recently cut down (Duffy 1960, Zaragoza-Caballero et al. 2017)  The aim of this study is to report the first occurrence of A. longimanus in the province of Corrientes, and to extend the previously known range of the geographic distribution.

Methods
The study site is located in Santo Tomé Department, Corrientes Province, Argentina (Figs 1, 2).The climate of the region is subtropical, with mean annual temperature greater than 20 °C and a mean?January temperature greater than 30 °C; the annual rainfall is about 1700 mm, mainly occurring in the summer months (600 mm), although occasional summer droughts may also occur (Servicio Meteorológico Nacional 2016).
Biogeographically, the study site is located in the Campos and Malezales Ecoregion; it is bordered by the Paranaense Ecoregion in the northeast and by the Ibera Marshlands and the Espinal Ecoregions in the west.The prevailing vegetation units are grasslands, known as "flechillar" due to the dominance of grass genera such as Stipa and Aristida, interrupted by isolated Chaco forest patches or remnant of slender Paranaense forests (Matteucci 2012).The area has softly undulating topography with altitudes between 130 and 200 m and is heavily fragmented due to deforestation; it is surrounded by Pinus spp.and Eucalyptus spp.plantations, tea, and yerba mate crops (Matteucci 2012).
The specimen was manually collected in November 2015, from a Ficus luschnathiana trunk, during faunal surveys.It was kept and taken to the laboratory, where it was sorted, identified, and labelled.The specimen was deposited (voucher number CARTROUNNE 6664) in the collection of the Universidad Nacional del Nordeste, Facultad de Ciencias Exactas, Corrientes, Argentina.
Historical records on the geographic distribution of the species were obtained from published data (Table 1).If the geographic coordinates were not provided, localities were geolocated with Google Earth (Google 2017).The distribution map was designed using Quantum GIS 2.18.14 (datum WGS84).
Identification.The specimen was identified following descriptions provided by Duffy (1960), Vizcarra-Sánchez (2004), and Douglas and Salazar (2005); the identification was also supported by comparison with specimens deposited in the collection of the Museo Argentino de Ciencias Naturales "Bernardino Rivadavia" (MACN).The species was confirmed by the specialist Miguel Angel Monné (Museu Nacional/UFRJ, Rio de Janeiro, Brazil).
The adults of A. longimanus (Fig. 3) have the following characteristics: large, with a body length range from 43 to 75 mm; antennae black, longer than body length, with 11 antennomeres, with small orange spots at the junction; prothorax with long spine-shaped tubercle on each side; elytra with black background color with symmetrical, greenish yellow and reddish orange, colored patterns covered by dense pubescence; males with extremely long forelegs, its length can reaches 150 mm, and the protibiae exhibit certain degree of curvature; and femora are flattened, black and with tiny orange-red transverse spots at the end of the junction with the tibiae.

Geographical distribution.
The previously known geographic distribution of this species extends from Mexico throughout Central and South America (except Chile and Uruguay).It was earlier reported from Misiones, Argentina, and a new state record from Corrientes is now added.

Figure 2 .
Figure 2. Remnant of the Paranaense Forest in San Alonso, Corrientes, Argentina.

Figure 1 .
Figure 1.Distribution of Acrocinus longimanus.Red dots are historic localities.Green dot (32) is the new locality.

Table 1 .
Acrocinus longimanus records including historic and new records.