Amblopusa brevipes Casey, 1893

[Japanese name: Kita-nokoba-umi-hanekakushi]

(Figs. 12C; 18E–G; 19; 26A)

Amblopusa brevipes Casey, 1893: 356 (original description; type locality: Fort Wrangel, Alaska); Zerche, 1998: 106 (characters; habitus photograph; phylogenetic analysis); Yoo &Ahn, 2020: 506 (redescription; habitus photograph). For other references, see Yoo & Ahn (2020).

Amblopusa pallida Casey, 1911: 212 (original description; type locality: Victoria, Vancouver Island).

Material examined. Japan: Hokkaidô: 58 unsexed, Ishikari-shi, Atsuta-ku, Gokibiru, 22. III. 2020, Y. Tasaku (KUM, cYT) ; 2 males, 1 female, 15 unsexed, ditto, 2. V. 2020, Y. Tasaku (cYT); 1 male, 4 unsexed, Shimamakimura, Taihei, estuary of Taihei-gawa, 12. V. 2020, D. Sumikawa (cYT) .

Diagnosis. This species can be distinguished from other Amblopusa species by the body size (about 2.5 mm) except A. pacifica . From A. pacifica, it can be distinguished the following characteristics: pronotum slightly convex with anterolateral margin rounded (Fig. 17C); median lobe of aedeagus with apical lobe acute at apex in lateral view (Fig. 18E).

Distribution. Japan: western Hokkaidô; Canada; USA: Alaska, the Aleutian Islands, California (Fig. 26A). Newly recorded from Japan.