Caenolister rectisternus Bickhardt, 1921

Caenolister rectisternus Bickhardt, 1921: 200 [Cameroon]: Ohara & Mazur, 2000.

Redescription (Ohara & Mazur, 2000).

Body oblong, depressed medially, black; tibiae reddish brown. Body length, female, PPL, 4.42; PEL, 3.13; APW, 0.92; PPW, 2.08; PL, 1.16; EL, 1.72; EW, 2.21; ProL, 0.40; ProW, 1.22; PyL, 0.43; PTL, 0.66; MSTL, 0.63; MTTL, 0.69.

Antennal club with almost straight sutures (Fig. 2B), which are indistinct medially. Ratio in width of pronotum to head 2.52. Front of head (Fig. 2A) feebly excavate; surface evenly covered with moderate sized punctures that are separated by two to seven times their diameter. Frontal stria of head shortly impressed anteriorly and latero-basally. Orbital stria absent. Labrum transverse and short, the anterior margin straight. One denticle present on inner margin of mandible.

Pronotum (Fig. 2C) feebly depressed medially; marginal stria complete laterally and shortly interrupted behind head; outer lateral pronotal stria well impressed and abbreviated on apical sixth, its outer edge subcariniform. Apical stria (part of outer lateral stria) present and crenate behind head. Surface of pronotum densely covered with coarse punctures on lateral fourth, the punctures separated by about twice or three times their diameter; interspace among the coarse punctures and remaining area finely punctate, the punctures separated by about three to seven times their diameter; several coarse punctures present along basal margin on lateral third. Antescutellar area without impression.

Epipleura (Fig. 2D) with a complete epipleural marginal stria, the outer edge subcariniform. Elytral marginal stria complete and strongly sinuate medially. External subhumeral stria absent. Internal subhumeral stria (Fig. 1C) complete. Oblique humeral stria slightly impressed on basal fourth. First to 3rd dorsal striae complete and the basal ends bent inwardly; 4th dorsal stria shortened on basal half; 5th dorsal and sutural striae present on apical sixth. Surface of elytra covered with fine punctures that are separated by five to ten times their diameter, the punctures becoming coarser on broad apical band along the elytral posterior margin.

Propygidium (Fig. 2C) irregularly covered with large and round punctures on basal half, the punctures separated by their own diameter to one-third the diameter; interspace among the large punctures intermingled with fine punctures; transverse stria present along anterior margin, the stria shortly interrupted medially. Pygidium covered with fine punctures that are separated by four times their diameter, the punctures becoming coarser on basal third.

Prosternal lobe (Fig. 2D) broad and feebly convex medially, its anterior margin arcuate outwardly; marginal stria absent; surface covered with coarse punctures that are separated by one to three times their diameter; interspace among the coarse punctures intermingled with fine punctures. Prosternal process flat, with distinct carinal striae, the striae feebly converging anteriorly, and their ends united with each other anteriorly and posteriorly; surface sparsely and finely punctate, the punctures separated by two to five times their diameter; posterior margin slightly arcuate outwardly. One lateral prosternal stria present and strongly oblique outwardly.

Mesosternum (Fig. 2D) transverse and flat; surface sparsely covered with fine punctures that are separated by about five times their diameter; anterior margin feebly arcuate inwardly; marginal stria of mesosternum interrupted shortly antero-medially, the outer edge cariniform; another stria present behind antero-lateral angle. Meso-metasternal suture finely impressed and arcuate anteriorly. Intercoxal disc of metasternum sparsely covered with fine punctures that are separated by three to ten times their diameter. Lateral metasternal stria extending posteriorly, its outer edge cariniform, the apical end attaining nearly to metacoxa. Post-mesocoxal stria well cariniform and almost parallel to lateral metasternal stria. Lateral metasternal disc densely covered with large, round and deep punctures that are separated by one-fourth their diameter; interspace between lateral and post-mesocoxal striae sparsely covered with few coarse punctures.

Intercoxal disc of 1st abdominal sternum (Fig. 2D) finely punctate, the punctures separated by three to seven times their diameter; two lateral striae present on each side, the inner stria complete and the outer present shortly on median third; the outer edges of the striae subcariniform. Lateral disc densely covered with large, round and deep punctures. Second to fourth abdominal sterna coarsely and densely punctate laterally.

Protibia (Fig. 2E, F) with 4 spiny denticles on outer margin, the basalmost one distant from the others, and a pair of spines at inner angle on apical margin. Mesocoxa without distinct carina. Mesotibia (Fig. 2G) with 2 spiny denticles on outer margin, and 4 spines present on apical margin; ventral surface without spiny row. Metatibia (Fig. 2H) with 2 spines on outer margin, and 4 spines on apical margin; ventral surface without spiny row. Ventral surface of profemur with transverse and large punctures.

Female genitalia (Fig. 3). Coxite short. Spermatheca oblong.

Specimens examined. Cameroon. 1 ex., Type, N.W.Kamerun, Moliwe b. Victoria, 17.I ­ 7.III.08, Frfr. v. Maltzan G., Type (red label), Caenolister rectisternus ns H. Bickhardt, det. 1920 (DEI).

Distribution. Cameroon.

Fig. 2. Caenolister rectisternus. A: Head, frontal view. B: Antenna, ventral view. C: Adult, dorsal view. D: ditto, ventral view. E: Right protibia, ventral view. F: ditto, dorsal view. G: Left mesotibia, ventral view. H: Left metatibia, ventral view. (Ohara & Mazur, 2000).

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