Chaetocnema (Chaetocnema) furthi Medvedev, 1996

Ruan, Yongying, Yang, Xingke, Konstantinov, Alexander S., Prathapan, Kaniyarikkal D. & Zhang, Mengna, 2019, Revision of the Oriental Chaetocnema species (Coleoptera, Chrysomelidae, Galerucinae, Alticini), Zootaxa 4699 (1), pp. 1-206 : 53

13. Chaetocnema (Chaetocnema) furthi Medvedev, 1996

( Fig. 32 )

Chaetocnema furthi Medvedev, 1996: 68 . TL: Philippines, Luzon, Mount Makiling. TD: USNM.

Distribution: Philippines (Luzon, Mount Makiling), India.

Host plant: Unknown.

Description: Body Length 2.10–2.20 mm, body width 1.20–1.25 mm. Ratio of elytron length (along suture) to width (maximum): 2.30–2.40. Ratio of pronotum width (at base) to length: 1.40–1.50. Ratio of length of elytron to length of pronotum (along middle): 2.45–2.55. Ratio of width of elytra at base to width of pronotum at base (in middle of humeral calli): 1.10–1.15. Ratio of maximum width of elytra to maximum width of pronotum: 1.50–1.60.

Elytra and pronotum brownish black. Antennomeres yellow brown to dark brown, darker distally. Tibiae and tarsi yellow brown. Pro- and mesofemora yellow brown. Metafemora brownish black.

Head hypognathous. Frontal ridge narrow, convex. Frontolateral sulcus present. Suprafrontal sulcus shallow. Ratio of width of frontal ridge to width of antennal socket: 1.25–1.35. Frons laterally with long setae. Vertex strongly raised above level of orbit. Vertex with scattered punctures bearing white seta in middle, and 3–4 punctures on each side near eye.

Base of pronotum without short longitudinal impressions, deep transverse row of large punctures absent. Pronotal base moderately expanded in middle. Pronotum without shallow antebasal transverse impression. Lateral margins of pronotum straight, converging forward. Anterolateral prothoracic callosity protruding forward, angulate. Posterolateral prothoracic callosity poorly developed. Diameter of pronotal punctures 2 to 4 times less than distance between them.

Elytra with convex sides. Elytral punctures larger than those on pronotum. Scutellar row of punctures on elytron regular and single. Second to eleventh rows of punctures regular. Humeral callus well developed.

Large lateral denticle on metatibia sharp. Metatibial serration proximal to large lateral denticle absent or poorly developed

Type: ♂ (Holotype) ( USNM), 1) Mt. Makiling , Luzon, Baker; 2) Holotypus, Chaetocnema furthi m., L. Medvedev det., 1996. 3) Type Number 10553, U. S. N. M.

2♀ (Paratypes) ( USNM), 1) Mt. Makiling , Luzon, Baker; 2) Paratypus, Medvedev det.

Material: 1♂ ( USNM), Dolores Luzon PI ( Phillipines ), Altitude 1200ft, XI.1945, BMalkin, Chaetocnema sp. det. A.Konstantinov , Chaetocnema furthi Medvedev det. Yongying Ruan, 2016; 1 male ( BMNH), Belgaum ( India), 1966, Andrewes, Bequest, B. M. 1922–221, Chaetocnema furthi Med.,1996 , Det. Yongying Ruan , 2016; 2♀ ( BMNH), H. L. Andrewes , Nilgiri Hills ( India), Andrewes, Bequest, B. M. 1922–221, Chaetocnema furthi Med.,1996 , Det. Yongying Ruan , 2016.

Remarks: Chaetocnema furthi very closely resembles C. simplicifrons . However, the frons and frontal ridge are distinctly narrower in C. furthi than in C. simplicifrons . Antero-lateral callosity of pronotum is narrow, rightangled and produced forward in C. furthi , while the same is well formed, obtusely angulate and facing antero-laterally in C. simplicifrons .

C. furthi also resembles C. puncticollis , but they differ in the shape of pronotum (antero-latral angle of pronotum weak and pointed in C. furthi while strong and truncate in C. puncticollis ) and aedeagus (from lateral view, apex of aedeagus only slightly bent ventrally in C. furthi while strongly bent ventrally in C. puncticollis ).

Figures

FIGURE 32. Chaetocnema furthi. A Holotype, dorsal view. B Pronotum and peri-scutellar area (Holotype). C Head, frontal view (Holotype). D Aedeagus, ventral view. E Aedeagus, lateral view. F Apex of aedeagus, ventral view. G Lateral view of head (Holotype), indicating strongly raised vertex