Agabus anguluverpus Englund, Njoroge & Bergsten sp. nov. Figures 1, 7A, 8F, 10C, 11K, 11O, 12, 13, 14, 20, 21

Type locality.

Kenya, Mount Kenya, Chogoria, Lake Ellis, -0.123N, 37.401E.

Type material.

Holotype ♂ (NMK) labelled: "Kenya, Mt. Kenya, Lake Ellis, Chogoria. - 0.123S 37.401E. 17.IX.2015 Leg. W. Wamiti". Paratypes 1 ♂ 1 ♀ (NHRS, NMK) labelled: "Kenya, Mt. Kenya, Lake Ellis, Chogoria. - 0.123S, 37.401E. 17.IX.2015 Leg. W. Wamiti".

Diagnosis.

This species is in some respects similar to A. sjostedti and A. dytiscoides in that females are matte due to a coarse dorsal microsculpture, and although the pronotal hypomeron is not or barely visible in strict lateral view, the pronotal bead is broader anteriorly (see Fig. 10C). The subapical portion of aedeagus is not prolonged, which is similar to South African species of the group, but the apex is straight in ventral view which is unique in the group. The aedeagus is evenly thickened, and essentially lacks the subapical broadening seen in most raffrayi group taxa (see Fig. 8).

Description.

Habitus as in Fig. 11K, O.

Colour: Head rufopiceous with testaceous interocular spots and an anterior testaceous area. Pronotum brown to rufopiceous with testaceous margins; some specimens with a diffuse rufotestaceous area in the middle of the pronotum. Elytron brown to testaceous brown. Ventral surface rufous, hypomeron testaceous, epipleuron testaceous brown. Legs rufous to testaceous. Antennae and palpi testaceous. The three specimens collected were all teneral individuals, especially the two paratypes, and as a result there is a probability that non-teneral individuals of this species will be somewhat darker than described here. In particular the pronotum may be darker medially in non-teneral individuals.

Microreticulation: Males with medium impressed reticulation on head and pronotum. Females with much coarser and larger meshes than males, giving pronotum and elytra a matte appearance. Both sexes with a mixture of small and somewhat larger meshes.

Structural features: Body length: 7.36-7.52 mm (see Table 1). Hypomeron not or barely visible in strict lateral view (see Fig. 10C), lateral bead of pronotum broad and well defined, broader anteriorly (see Fig. 10C). Metasternal wing narrow, WC/WS 3.0 or more in both males and females (see Table 1 and Fig. 12). Pronotum more than twice as broad as interocular distance (see Table 1 and Fig. 13), lateral margins straighter anteriorly and more curved posteriorly.

Legs: Protarsal claws long,> 1.6 × as long as protarsomere 4 (see Table 2, Fig. 14). Metatarsomeres very long and slender; metatarsomere 2> 1.8 × as long as broad in both females and males (see Table 2), and metatarsomere 5> 3.3 × as long as broad in males (see Table 2).

Male genitalia: Aedeagus without distinct subapical broadening and without subapical prolongation; subapical tooth angled both basally and subapically (see Fig. 8F). Aedeagus with straight apex in ventral view.

Female: Elytral and pronotal microreticulation much coarser than in males.

Distribution.

Only known from Mount Kenya in central Kenya (see Fig. 1).

Habitat.

Lake Ellis is situated at an altitude of about 3500 m on Mount Kenya’s eastern slope (Figs 20, 21).

Etymology.

The species name refers to the angled subapical tooth of the male genitalia (Latin: angulus = angle, verpus = penis).