Isomerida albicollis ( Laporte, 1840 )

Tavakilian, Gérard L. & Santos-Silva, Antonio, 2019, New Hemilophini, Aerenicini and Calliini from French Guiana, transference and notes on Hemilophini (Coleoptera, Cerambycidae, Lamiinae), Zootaxa 4555 (4), pp. 507-522 : 512

Isomerida albicollis ( Laporte, 1840)

( Figs 8–12 )

Hemilophus albicollis Laporte, 1840: 488 .

Isomerida albicollis ; Bates, 1866: 373; Galileo & Martins, 1996: 240 (syn.); Monné, 2017: 421 (cat.; see this catalogue for more references).

Hemilophus anceps Aurivillius, 1919: 7 .

According to Galileo & Martins (1996) (translated): “ I. invicta is characterized by the large dimensions and the presence of a longitudinal carina at center of dorsal surface of the elytra.” They also used these tow features to separate I. invicta from I. albicollis in the key (translated):

“11(10). Centro-dorsal carina of the elytra well-marked from base to beyond middle; large dimensions (length 15.7-15.8 mm). Peru

(Junín)...................................................................................... I. invicta - Centro-dorsal carina of the elytra absent; smaller dimensions (length smaller than 13 mm)..........................

........................................................................ 12 [conducting to I. albicollis ].”

Notwithstanding nearly all specimens of I. albicollis examined by us have the dorsal carina of the elytra as in holotype and paratype of I. invicta , and the dimensions in I. albicollis are very variable.

These same features were used in the key to species of Isomerida from Martins & Galileo (2014b). Only the ventral setae of the antennomeres may, eventually, separate these two species (shorter and sparser in I. invicta ).

Figures

FIGURES 1–12. 1–3, Guyarolea lalannecassoui sp. nov., holotype male: 1, dorsal habitus; 2, lateral habitus; 3, head, frontal view. 4–7, Isomerida fourneti sp. nov., holotype male: 4, head, frontal view; 5, dorsal habitus; 6, lateral habitus; 7, antennomere V. 8–12, Isomerida albicollis, male: 8–10, dorsal habitus; 11–12, antennomere V.