Althanus teretrioides Lewis, 1903: 420 [Mentawai Is.]; 1914: 240, pl. IX, fig. 3.
Redescription (Ohara & Mazur, 2000).
Body cylindrical, reddish brown and shining; antenna, maxillary palpi and legs light brown. Body length* PPL, 3.00; PEL, 2.48; PW, 1.19; PL, 1.26; EL, 1.22; EW, 1.24; ProL, 0.35; ProW, 0.81; PyL, 0.47; PTL, 0.58; MSTL, 0.47; MTTL, 0.55.
Antennal club (Fig. 1B) with V-shaped sutures, which are interrupted medially. Ratio in width of pronotum to head 1.55. Front of head (Fig. 1A) feebly depressed; surface densely covered with fine and moderate sized punctures that are separated by three to six times their diameter, the punctures becoming coarser and sparser anteriorly and posteriorly. Frontal stria of head well impressed laterally but indistinct on anterior portion. Supraorbital stria absent. Labrum small and round, the anterior margin sinuate. One denticle present on inner margin of mandible.
Pronotum (Fig. 1C) quadrate, strongly convex medially; marginal stria complete and distinctly impressed laterally, its outer edge subcariniform; outer lateral pronotal stria incised on apical fourth. Apical stria (part of outer lateral stria) complete and its lateral ends curved posteriorly. Surface of pronotum evenly covered with coarse and deep punctures that are separated by their own diameter to five times the diameter; interspace among the coarse punctures intermingled with fine punctures that are separated by about twice their diameter. Antescutellar area with a long longitudinal impression on basal fourth of pronotum. Posterior margin of pronotum marginate on median half.
Epipleura (Fig. 1E) with marginal stria slightly impressed on median third. Elytral marginal stria well impressed laterally and shortened on apical sixth, its inner edge cariniform; the basal end of stria extending and attaining at lateral half of the basal elytral margin. Subhumeral striae (Fig. 1C) absent. Oblique humeral stria slightly impressed on basal half. First dorsal elytral stria distinctly incised on basal half and curved inwardly on basal part; 2nd stria incised on basal three-fifths; 3rd stria short, present on basal sixth; 4th and 5th striae absent; sutural stria distinctly impressed on basal two-thirds, the basal portion extending outwardly along basal elytral margin and the end connected with basal end of 3rd dorsal stria; surface of elytra sparsely covered with fine punctures that are separated by about four times their diameter, and also with coarse punctures intermingled sparsely on apical third, the coarse punctures separated by about three times their diameter.
Propygidium covered with large and shallow punctures that are separated by half to twice their diameter; interspace among the large punctures intermingled with fine punctures that are separated by two to seven times their diameter. Punctation of pygidium similar to that of propygidium but becoming smaller posteriorly.
Prosternal lobe (Fig. 1D) broad and feebly convex medio-posteriorly, its anterior margin arcuate outwardly; marginal stria impressed only medially; surface irregularly covered with fine and coarse punctures. Prosternal process narrow, only with flat area on posterior half; carinal striae distinct on posterior half, the posterior ends connected with each other to form an arc. Two lateral prosternal striae present, their outer edges strongly carinate.
Mesosternum (Fig. 1D) quadrate; surface sparsely covered with fine punctures that are separated by about ten times their diameter; anterior margin slightly emarginate medially; marginal stria of mesosternum complete, its outer edge subcariniform; another short stria present behind antero-lateral angle. Meso-metasternal suture finely impressed and angulate at middle. Intercoxal disc of metasternum sparsely covered with fine punctures that are separated by about ten times their diameter. Lateral metasternal stria straight and extending posteriorly, its outer edge cariniform, the apical end attaining near posterior three-fourths of length of metasternum. Post-mesocoxal stria straight, extending posteriorly and ended at basal half. Lateral metasternal disc densely covered with large, round and shallow punctures that are separated by about half of their diameter on basal third; the remains of lateral disc sparsely covered with fine punctures that are separated by about six times their diameter.
Intercoxal disc of 1st abdominal sternum (Fig. 1D) sparsely covered with fine punctures that are separated by three to seven times their diameter, and coarse punctures sparsely intermingled only on basal half; one lateral stria completely present on each side, its outer edge subcariniform. Lateral disc covered with large, round and shallow punctures that are separated by about their own diameter.
Protibia (Fig. 1F, G) with three large denticles on outer margin; dorsal surface with deep sinuate tarsal groove; on ventral side, two striae incised, the inner one diverging into two striae on apical half; inner base strongly angulate. Mesocoxa with carina. Mesotibia (Fig. 1H) with 3 robust spines on outer margin and 5 spines on apical margin. Metatibia (Fig. 1I) without spine on outer margin but with 5 spines on apical margin. Ventral surface of profemur with several coarse rugae on apico-posterior half.
Female genitalia (Fig. 1J). Coxite short and robust.
Fig. 1. Althanus teretrioides. A: Head. B: Antenna. C: Adult, dorsal
view. D: Ditto, ventral view. E: Ditto, lateral view. F: Left protibia,
dorsal view. G: Ditto, ventral view. H: Left mesotibia, ventral view. I:
Left metatibia, ventral view. J: Female genitalia, ventral view, with basal
part (8th abdominal segment) twisted rightward. (Ohara & Mazur, 2000).