Dallasiellus (Ecarinoceps) americanus (Stål)

(Figs. 7, 8B)

Aethus americanus Stål, 1860: 12; Walker, 1867: 152. Macroscytus americanus: Stål, 1876: 19 .

Geotomus americanus: Signoret, 1883: 34; Lethierry & Severin, 1893: 72. Dallasiellus (Ecarinoceps) americanus: Froeschner, 1960: 585 .

Material examined: 1 specimen, PA, Prainha, 06-Jan-1920, Mendes col., MNRJ ; 1 specimen, RJ, Petrópolis, Alto Mosela, 23-Feb-1956, D'Albuquerque col., MNRJ ; 4 specimens, Petrópolis, Alto Mosela, 01-Mar-1957, MNRJ ; 1♀, SP, Luiz Antonio, 13-Aug-2008, Perioto N col., UNIFESP; 1♀, RS, Cachoeirinha, 09-Feb-1981, M.H. Galileo col., MCNZ ; 1♀, Itaúba, 06-Apr-1978, E.H. Buckup col., MCNZ ; 1♀, Porto Alegre, 30-Oct-1973, Cesar Trois col., MCNZ .

Distribution: Brazil (PA new rec., RJ, SP new rec., SC, RS new rec.).

Remarks: The two species of the subgenus that present the evaporatorium not attaining the mesopleural lateral margin; can be differentiated for the number of secondary setigerous punctures on the submargin of mandibular plates along with the mesocorium surface, which is almost impunctate in D. americanus (Fig. 8B) with only one primary setae close to the eye, while in D. foratus is coarsely punctate and presents three secondary submarginal setigerous punctures on each mandibular plate.