Sphaerophysa piceicollis Jacoby, 1889: 195, by original designation. (Type locality: Burma).

Based on newly examined material, morphological characteristic of Jacobyana is revised and updated with respect to the original description (Maulik 1926). Body roundish, strongly convex (Figs 2, 8, 14). Head with evident setiferous punctures (Figs 3, 9, 15); antenna short, generally not reaching pronotal base (Figs 2, 8, 14); third antennomere clearly thinner than first two antennomeres and about as long or longer than fourth and fifth together (as in Jacobyana piceicollis and Jacobyana flurinae); distal antennomeres (7 through11) distinctly longer than middle ones (3 through 6). Pronotum (Figs 4, 10, 16) clearly transverse (WP/LP > 2.2), anteriorly narrower than posteriorly, without antebasal furrow; lateral margins distinctly bordered, with anterior setiferous pore rearward towards middle of pronotal side; posterior margin not bordered, clearly sinuous. Elytral punctation (Fig. 17) arranged in regular rows; interstriae flat. Hind femur strongly enlarged; all femora ventrally with a large and generally deep furrow as long as femoral length, with smooth surface, to receive tibiae in resting position; hind tibia dorsally clearly channeled with distinct apical spur; tarsal claw sub-appendiculate (Fig. 7). Ventral surface (Figs 5, 11, 18) with numerous setiferous punctures, generally rather uniformly distributed; procoxal cavities posteriorly open; metasternum about as long as first abdominal sternite; elytral epipleura wide and slightly concave.

Metafemoral spring (Fig. 19) similar to springs of Psylliodes morpho-group (Furth & Suzuki 1998) but likely constitutes a new morpho-group with dorsal lobe regularly curved, with rather long extended arm; basal edge straight, angled < 90° with central axis of dorsal lobe; dorsal edge of ventral lobe straight; basal angle of ventral lobe acute, short, apically pointed; recurve flange distinctly sclerotized.

Oriental (India, Nepal, Vietnam and Sri Lanka) (Medvedev 2009) and Afrotropical (Democratic Republic of Congo, Malawi, and Republic of South Africa) Regions (Fig. 1).

Jacobyana bezdeki sp.n. (LB = 2.64 mm), Jacobyana centrafricana sp. n. (LB = 2.66 mm), and Jacobyana sudafricana sp.n. (LB ♂ = 2.25 mm and ♀ > 2.43 mm) are the smallest species of the genus (Sprecher-Uebersax 2002). All new Afrotropical species share a ratio of the length between antennomeres 3 and 4 (= 2) with Jacobyana ovata Medvedev from Sri Lanka (known only by a single female). However, all three African species are distinguishable from Jacobyana ovata by their smaller size (Jacobyana ovata: LB = 3.40 mm), interantennal space distinctly narrower than length of first antennomere (as broad as first antennomere in Jacobyana ovata) and, with the exception of some specimens of Jacobyana sudafricana sp. n., by the colour of the dorsal integuments, never uniformly black (entirely black in Jacobyana ovata).