18, 1 Nakayama: Japanese Aphelininz 99 
The male is unknown. 
Host.—Coccus hesperidum Linn. 
Habitat.—Shizuoka-ken, Japan. 
Genus PERISSOPTERUS Howard 
Perissopterus mexicanus Howard. 
Revision of the Aphelinine of North America, Tech. Ser, Div. Ent., 
U. S. Dept. Agr. 1 (1895) 22, 23, fig. 5b; The Coccide of Japan, 
1 (1911) 20. 
Host.—Aulacaspis pentagona Targ. 
Habitat.—Tokio, Japan. 
Genus PROSPALTELLA Howard 
Prospaltella aurantii Howard. 
Revision of the Aphelinine of North America, Tech. Ser. Div. Ent., 
U. S. Dept. Agr. 1 (1895) 41, 42, fig. 18; The Coccide of Japan 
1 (1911) 21. 
Host.—Aspidiotus perniciosus Comst. 
Habitat.—Tokio, Shizuoka-ken, Japan. 
Prospaltella bérlesei Howard. 
On the parasites of Diaspis pentagona, Ent. News 17 (1906) 292, 
fig. [published October, 1906]; Redia 3 (1905) [published No- 
vember 30, 1906] 391, fig. 
Host.—Aulacaspis pentagona Targ. 
Habitat.—Tokio, Japan. 
Prospaltella niigate sp. nov. Plate 1, fig. 2. 
Female.—Length, 0.69 millimeters; expanse, 1.53; greatest 
width of forewing, 0.19. Thorax broader than abdomen; length 
about same; pedicel as long as segment 3 of funicle which is 
longer and broader than segment 1 or 2; segment 2 of funicle 
longer than segment 1; club segments 1 and 2 subequal in 
length; terminal segment pointed at apex; thorax, width greater 
than length; general color brownish yellow; antennz and legs 
light yellow; ocelli red; eyes black; abdomen black, broad ante- 
riorly with narrow, dark bands between the segments; meso- 
scutellar parapsides also black; wings hyaline; veins pale yellow; 
forewings not so densely covered with cilia as in Prospaltella 
berlesei; marginal fringe long. 
I reared this species from Aulacaspis pentagona Targ., infest- 
ing specimens of the mulberry tree that were brought from 
Tookamachi, Niigata-ken, in September, 1918, in the hope that 
