Eutaenia corbetti Gahan, 1893

Agarwala, B. K., Ghate, H. V. & Bhattacharjee, P. P., 2014, Redescriptions ofImantocera penicillataHope andEutaenia corbettiGahan (Coleoptera: Cerambycidae), with Records of Host Plants from India, The Coleopterists Bulletin 68 (4), pp. 719-726 : 719-726

Eutaenia corbetti Gahan, 1893

( Figs. 7–10 )

Material Examined. 1 ♂, coll. P. P. Bhattacharjee and 1♀, coll. D. K. Sinha, 09.viii.2013, host plant Caesalpinia decapetala (Roth) Alston, Tuisangma (23°59′47.81″ N and 91°29′36.27″ E, altitude 142 metre), west Tripura district .

Diagnosis. Eutaenia corbetti can be recognized by the following combination of characteristics: two transverse bands on the prothorax, one anteriorly and another basally, covered with yellowish pubescence, both broadly interrupted in the middle; six spots and two posterior vittae present on each elytron, covered with a thick yellowish, tawny pubescence, three of these form a transverse row a little behind the base.

Redescription of Male. Body 19.20 mm long, dark black; Head: Broadly concave between antennal tubercles, frons rectangular, broader than long ( Fig. 7a ); 2 transverse bands on prothorax, one anteriorly and another at base covered with yellowish pubescence, both broadly interrupted in middle ( Fig. 7a ). Antennae dark brown, 34.44 mm long, about 1.79 times longer than the body ( Table 2). Thorax: Each elytron with 6 spots and 2 posterior vittae, covered with a dense yellowish-tawny pubescence, 3 anterior spots forming a transverse row a little behind the base, the innermost spot much smaller than 2 exterior ones; 2 heart-shaped spots placed near middle along inner margins, 2 posterior spots larger and thumb-shaped; vittae nearest suture broader and toe-shaped, other vittae elongated and narrow along elytral margins and united at apical border ( Fig. 7a ). Black portions of prothorax and elytra covered with black powdery or scaly pubescence, densely and coarsely punctate ( Figs. 7a ). Body beneath and legs yellowish, covered with dense, pale, fulvous pubescence ( Fig. 8a ). Abdomen: Last abdominal ventrite perpendicular to body axis ( Fig. 9a ) and rounded at free end ( Fig. 10a ).

Redescription of Female. Larger than male, body 28.25 mm long, deep black in color with yellow spots and vittae. Head: Antennae deep brown to black, 32.88 mm long, about 1.16 times longer than the body ( Fig. 7b , Table 2). Thorax: Number of elytral spots and posterior vittae same as in male, covered with thick, yellowish tawny pubescence ( Fig. 7b ). Body beneath and legs yellowish, similar to male ( Fig. 8b ). Legs longer than those of male. Abdomen: Last abdominal ventrite emarginated, slightly bent downward ( Fig. 9b ) and bidentate at free extremities ( Fig. 10b ), forming short, blunt tooth on each side; other characters as in male.

Notes. Gahan (1893) described E. corbetti from Myanmar, but there was vagueness regarding the sex and the number of specimens available at the time of original description, and he provided scant information on morphology without any morphometry or illustration. The species was distinguished from the type species of the genus ,

THE COLEOPTERISTS BULLETIN 68(4), 2014 725

Eutaenia trifaciella White, 1850 , by “possessing entirely black antennae together with the style of marking”. Since then, the genus is known by nine species described between 1850 and 1965 by various authors. The genus is distributed in Myanmar, Laos, Taiwan, and Thailand (www. lamiinae.org/80v/index.php?pg=clm&lg=en, Catalog of the Lamiines of the World, subfamily Lamiinae ), and three species from India, E. oberthueri , E. trifaciella , and E. corbetti . The genus has not been reviewed or revised, and, therefore, there is a general lack of credible taxonomic and phylogenetic information about the nine species that are currently treated under the genus. Moreover, none of the species have been previously recorded from the eastern part of India.

Figures

Figs. 7–8. Eutaenia corbetti. 7) Dorsal habitus: a) Male, b) Female; 8) Ventral habitus: a) Male, b) Female.

Figs. 9–10. Eutaenia corbetti, abdomen. 9) Posterior part, lateral view: a) Male, b) Female; 10) Terminal segments: a) Male, b) Female.