Alcidodes sterryorum Lyal, 2000

Lyal, C. H. C. & Curran, L. M., 2000, Seed-feeding beetles of the weevil tribe Mecysolobini (Insecta: Coleoptera: Curculionidae) developing in seeds of trees in the Dipterocarpaceae, Journal of Natural History 34 (9), pp. 1743-1847 : 1815-1818

Alcidodes sterryorum Lyal , n.sp.

Robust insects, with protruding humeral angles; length 3.80±5.85 mm (xÅ5 l4.73, m 5.25), PW 5 1.90±3.05 mm (xÅ5 l2.48, m 2.81), HW5 2.4±3.9 mm (xÅ5 l3.14, m 3.54) (n 5 l18, m 12) (®gures 32, 63, 83).

Head. Rostrum arises from front of head adjacent just below (m) or just above (l) top of eye; evenly curved, less punctate and more slender in female ( RL 5 1.6±2.2 mm, xÅ5 2.00 mm; RL/ PW 5 0.66±0.74, xÅ5 0.71; RB/RD 5 0.83±1.00, xÅ5 0.92; n 5 12) (®gure 207) than in male ( RL 5 1.25±2.05, xÅ5 1.72 mm; RL/ PW 5 0.65±0.76, xÅ5 0.69; RB/RD 5 0.92±1.14, xÅ5 1.02; n 5 18) rostrum of similar length in both sexes (®gure 208) .

Thorax. PL/PW 5 0.61±0.67 (xÅ5 0.65, n 5 30), no signi®cant sexual dimorphism; prothorax lacking tubercle behind fore coxae. Elytra with interstriae fairly smooth or with small weak granules proximally and on disc, strial punctures much narrower than interstriae, humeri not projecting greatly, with interstria 9 generally visible beyond 8 in dorsal view (®gures 32, 50); EL/HW, m, 1.05±1.09 (xÅ5 1.07, n 5 12),, l1.05±1.14 (xÅ5 1.09, n 5 18). Elytral scales hair-like, uniform. Fore femur with ventral tooth as in ®gures 140, 170, 171, with proximal lobe lying along femur and sometimes di cult to see, particularly in female, central lobe at right angles to long axis of femur, distal margin with one or two small teeth in male, more in female, not clearly formed into distal lobe; fore tibia with ventral tooth, mid and hind tibiae lacking ventral tooth. Ventral margin of metasternum convex, not strongly divergent from elytral margin (®gure 14).

Abdomen. Male ventrite 5 with large median oval depression, with denser patch of scales to each side (®gure 114). Female ventrite 5 with shallow median depression more or less apparent, not bordered by any specialized scales (®gure 115).

Male terminalia. (®gures 372±378). Tergite 7 (®gure 372) with posterior margin weakly concave; a single prominent plectral tubercle near posterior margin on each side, approximately six other pairs, di cult to see, in longitudinal rows extending nearly to base of tergite. Segment 8 as ®gure 373. Tegmen (®gures 374, 375) with parameres separate at base, approximately as long as width of tegminal ring. Membrane between tegmen and aedeagus developed into long lobes (®gures 376, 378). Aedeagus (®gure 376±378) with sides concave, apex truncate; strongly curved in lateral view (®gure 378). Ostiolar sclerites fused to dorsal sclerotization of aedeagus although visible as darker bands on the surface of the aedeagus, extending inside endophallus as indistinct elongate sclerites.

Female terminalia. (®gures 379±382) Tergite 7 with ®ve or six pairs of plectral tubercles, very obscure, along median edge of wing-binding patch and towards posterior margin (®gures 379, 380). Tergite 8 with broadly rounded posterior margin, disc and median anterior margin more weakly sclerotized than other margins (®gure 381). Spiculum ventrale (®gure 382) with broad part quadrate, not as long as apodeme. Female genitalia as in ®gures 383, 384; hemisternites short, styli relatively long; ductus seminalis arising on bursa distad of its junction with common oviduct; spermatheca gland lobe with bulb (®gure 383).

Distinguishing features. A. sterryorum is found on the same hosts as ®ve other species of similar size, A. confusus , A. walliorum and A. fugitus (in the crassus group) and A. hopeae and A. gonzoi (both dipterocarpi group). The distinguishing features of A. confusus , A. walliorum and A. fugitus have been discussed above. A. sterryorum can be distinguished from both A. hopeae and A. gonzoi by the pro®le of the head (®gures 203±208), the rostrum arising in a more dorsal position in this species than in the other two.

Comments. This species has only been reared from the seeds of Hopea species.

Etymology. The species is named for May and Bob Sterry of Overstrand, UK.

Specimens examined

HOLOTYPE ,, l Indonesia: Kalimantan, with labels:`Holo- / type’ and`LAB. REARED: / Ex seeds / Hopea sangal / ( Dipterocarpaceae ) ’ and`91Hsang5 ’ and` INDONESIA: / W. Kalimantan; / Gunung Palung / Nat. Pk., Cabang / Panti Res. Stn.’ and`1ss15¾S. 110ss05¾E / January± April 1991 / Lisa M. Curran’ and`707’ and` HOLOTYPE: / Alcidodes / sterryorum Lyal / Lyal det 1997’ ( MZB).

PARATYPES: Indonesia: Borneo: Kalimantan: same locality and collector as Holotype, reared from seeds of: Hopea sangal (19 ll, 9mm); Hopea ferruginea (4mm) ( BMNH, MZB, UMMZ).

Brunei: 1, l Temburong District, Kuala Belalong, September ± October 1992 (Lyal and Margerison Knight), reared from seed of Hopea sp. ( RBM)

Range. Borneo.

Hosts. Hopea ferruginea Parijs , H. sangal Korth.