Hemiphileurus kahni Dupuis and Dechambre

Ratcliffe, Brett C., 2001, New Species Of Hemiphileurus Kolbe (Coleoptera: Scarabaeidae: Dynastinae) From Mexico, Guatemala, Colombia, And Brazil, The Coleopterists Bulletin 55 (4), pp. 433-443 : 434-436

Hemiphileurus kahni Dupuis and Dechambre

( Figs. 1 –3)

Hemiphileurus kahni Dupuis and Dechambre 2000:26 .

This species was described from a single male specimen from Genaro Herrera, Loreto, Peru. The specimens listed below represent a NEW COUNTRY

RECORD:

BRAZIL: Amazonas ; Rio Taruma Mirim—Igapo; J. Adis, 2.IX.1976 (2 specimens) and 10.XI.1976 (1 specimen). Specimens are deposited at the Instituto Naçional de Pesquisas da Amazonia (Manaus, Brazil) and in the B. C. Ratcliffe collection .

The Peruvian specimen was collected to the SSW of Iquitos where the El Capite river empties into the Ucayali which, in turn, almost immediately empties into the Amazon. The Brazilian specimens were taken near Manaus just above where the Rio Negro joins the Amazon. These two localites are approximately 1,540 km apart and are both characterized by lowland rainforest. The Brazil specimens represent a substantial range extension.

Inasmuch as the description by Dupuis and Dechambre did not include a female, is based on only one specimen, and is overly brief, I provide below a detailed re­description.

Male. Length 22.4 mm; width 10.7 mm. Color black. Head: Surface completely, transversely rugose. Frons with large, laterally compressed tubercle mesad of anterior border of each eye; surface between tubercles foveate, moderately rugose. Clypeus triangular, apex acute and strongly reflexed, a distinct carina extending from apex to base of each tubercle. Interocular width equals 4.5 transverse eye diameters. Antenna with 10 segments, club slightly longer than segments 2–7. Mandibles arcuate on lateral edge, apices acute. Pronotum: Surface finely shagreened, moderately punctate; punctures moderately large, each with a minute seta, punctures becoming slightly denser on sides. Median, longitudinal furrow shallow (nearly obsolete), becoming wider apically, not reaching base or apex. Base with complete marginal bead. Elytra: Surface with 5 distinct, punctate striae between suture and humeral umbone; punctures large, ocellate, separated from one another in each row by 1–2 puncture diameters. Intervals convex, with sparse micropunctures. Pygidium: Surface completely, densely punctate; punctures large, deep, setigerous; setae tawny in color, short, a few longer at center apex. In lateral view, surface strongly convex. Legs: Foretibia tridentate, teeth subequally separated. Median transverse carina on meso­ and metatibiae ending in a long, acute spine on upper surface. Apex of posterior tibia with strong, acute spine on upper angle and with 8 short, broad spinules below spine. Apex of first tarsomere on posterior tarsus with strong, acute spine dorsally. Venter: Prosternal process broad, moderate in length, apex flattened into a concave, suboval plate (Fig. 3). Last sternite with small, dense punctures in lateral angles, elsewhere with small, sparse punctures. Parameres: Figures 1–2 .

Female. Length 23.0– 23.4 mm; width 11.2–11.3 mm. As male except in the following respects: Pronotum: Punctures slightly larger. Elytra: Intervals slightly wider. Pygidium: Setae shorter. Venter: Last sternite completely, moderately densely punctate, punctures moderate in size.

Remarks. Hemiphileurus kahni will key only to couplet 41 in Endrödi (1985) where the following two choices are for Mesoamerican species [ H. laevicauda (Bates) and H. punctatostriatus (Bates) ] that each have totally different parameres than H. kahni . The parameres ( Figs. 1–2 ) of H. kahni are unique among species of Hemiphileurus and are diagnostic for the species. The distinct microsetae in the pronotal punctures are also unusual for a species of Hemiphileurus , but this may simply reflect a pristine specimen where the

Fig. 3. Prosternal process of H. kahni Dupuis and Dechambre.

Figs. 4–5. Parameres of holotype of H. bispinosus Ratcliffe , n. sp.

Fig. 6. Prosternal process, lateral oblique view, of H. deslislesi Ratcliffe , n. sp.

Figs. 7–8. Parameres of holotype of H. deslislesi Ratcliffe , n. sp.

Fig. 9. Parameres of H. variolosus (Burmeister) .

Fig. 10. Prosternal process, lateral oblique view, of H. variolosus (Burmeister) .

Figs. 11–13. Parameres of H. rugulosus Endrödi. 11–12) new drawing; 13) Endrödi drawing.

tiny setae have not been worn away; these setae are less noticeable in the two other specimens.

The biology of this species is unknown. The specimens reported here were collected in arboreal photoeclectors mounted on tree trunks in an area of blackwater inundation forest (igapo) near where the Tarumã Mirim river empties into the Rio Negro about 20 km upstream from Manaus ( Adis 1981). The photoeclector traps were modified to capture insects walking downward on the trunk of the trap tree.

Figures

Figs. 1–2. Parameres of H. kahni Dupuis and Dechambre.