116 
Psyche 
[April 
less suffused with brown. The first male genital segment black 
above with the lateral and posterior portions yellowish brown, 
dark brown beneath; the horn-like processes slender and very 
dark in color; second segment yellowish brown beneath. 
Length of body: d' 5 mm., 9 5 mm. 
Holotype, cf, allotopotype, d, and paratopotypes: Abu- 
ratsubo creek near Misaki, Province of Sagami, Japan, July, 
1921 (Teiso Esaki). Paratypes: the coast of the Province of 
Kii (Mr. Takeuchi), the coast of the Province of Tosa (Mr. 
Takenouchi) . Types in my collection. 
This species is found rapidly striding on calm water close to 
the shore near the head of Aburatsubo creek. A few probable 
examples of this species were observed by me on the Kagoshima 
Bay, the southernmost portion of Japan proper. 
Although resembling Halohates germanus White, this species 
differs from it in its blackish coloration, rnuch larger size, and 
in the structure of antenna. 
Halobates germanus White. 
Halohates germanus White, Chalk Rep., Zook, vok 7, pt. 9, 
p. 50, pk 1, fig. 6, 1883. Dahl, Plank, Exp., vok 2, p. 7, 1893, 
Distant, Fauna Brit. Ind., Bhyn., vok 5, p. 152, 1910. 
This species has hitherto been recorded from the following 
localities: “Celebes Sea,’’ “between the Admiralty Islands and 
Japan,’’ “Mare della China” (After White), “Andeman Sea” 
(After Distant). I have not yet found this species near either 
Japan or Formosa, but have in my collection four specimens of 
it from Papan, Johore, Malay Peninsula (Mr. Fukushima). 
Halobates sericeus Eschscoltz. 
Halohates sericeus Eschscholtz, Emtomogr., vok i, p. 108, 
1822. Burmeister, Handb. Entom., vok 2, p. 209, 1835. Amyot 
et Serville, Hem., p. 412, 1843. White, Chalk Rep. Zook,vok 
7, pt. 19, p. 47, 1883. Dahl, Plank. Exp., vok 2, p. 7, 1893. 
