Bannacoris Hsiao 1964

GenusBannacorisHsiao, 1964 Bannacoris Hsiao, 1964: 283. Type species by original designation: Bannacoris arboreus Hsiao, 1964. Diagnosis. Bannacoris can be distinguished from the two other known saileriolid genera, Ruckesona Schaefer & Ashlock, 1970 and Saileriola China & Slater, 1956, by a combination of the following characters: head with a median sulcus on vertex (without a median sulcus on vertex in Ruckesona); compound eye separated from anterior margin of pronotum (close to anterior margin of pronotum in Ruckesona and Saileriola); a pair of ocelli closer together than a diameter of ocellus (separated by more than 3.0 times of a diameter of ocellus in Ruckesona); antennomere I more than 1.5 times as long as antennomere II (less than 1.5 times in Ruckesona); lateral margin of pronotum serrate in anterior part (nearly straight in Saileriola), without distinct spine (with two distinct spines in Saileriola); and corium of forewing mostly punctate (punctate only along claval and median furrows in Saileriola). Remarks. The following characters in the original description are the diagnostic characters of the family Saileriolidae, partly including misinterpretation, and are unable to distinguish this genus from other saileriolid genera (Hsiao 1964; Schaefer and Ashlock 1970; Rider et al. 2018; present study): ostiole of metathoracic scent gland quite small (absent in original description); peritreme absent; and tarsi three-segmented (two-segmented in original description). Additionally, hindwing venation, which differs between Ruckesona and Saileriola, was not considered in the present study because of the lack of a detailed description of the type species of Bannacoris, B. arboreus (cf. Hsiao 1964). Thus, based on the original descriptions of the three known saileriolid genera (China and Slater 1956; Hsiao 1964; Schaefer and Ashlock 1970) and the first author’s examination, we provisionally redefine the morphological characteristics shared by Bannacoris species, as described in the Diagnosis section above, and propose a new combination, Bannacoris hyalinus (Schaefer & Ashlock, 1970), comb. nov., which is transferred from Saileriola to Bannacoris. In conclusion, the genus Bannacoris comprises two species, B. arboreus from China and Thailand and B. hyalinus comb. nov. from Vietnam (Hsiao 1964; Schaefer and Ashlock 1970; Rider et al. 2018; present study).