68 
Psyche 
[ March 
specimens; base of first gastric segment not yellowish red 
but dark brown like the remainder of the gaster. 
Six specimens from Eastern Tombs, near Peking, China 
(Chi Ho). 
Formica truncorum var. yessensis Forel 
Six workers from Nankataigan, Formosa, collected by 
J. Sonan are really intermediate between the preceding 
form and sinensis Wheeler from Western China, the dorsal 
surface of the head and thorax being less hairy than in 
approximans and the typical truncorum and the tibise with- 
out oblique hairs, as in yessensis and sinensis. 
Formica yoshiokae sp. nov. 
Worker. Length 4-6 mm. 
Closely related to F. picea Nylander. Jet black; palpi, 
mandibles, antenna, tarsi and articulations of legs deep 
piceous brown. Surface of the body, and especially of the 
gaster, even smoother and more shining than in picea; 
mandibles subopaque, densely and rather coarsely punc- 
tate-striate ; clypeus and cheeks with very sparse, elongate, 
piligerous punctures. Head broader than in picea , epino- 
tum of the same shape, in profile with straight and nearly 
horizontal base, forming a distinct obtuse angle with the 
declivity, which is straight, sloping and of the same length. 
Petiole with the superior border more compressed, more 
acute and distinctly notched in the middle. Hairs white, 
rather short, very sparse on the upper surface of the head 
and thorax and on the petiolar border; more numerous on 
the gaster, absent on the legs, which have only the usual 
row of bristles on the flexor surface of the tibise. Pubes- 
cence pale, distinct, but short and very dilute on the head, 
denser on the mesosterna and legs, lacking on the gaster. 
Described from ten specimens taken by Mr. H. Yoshioka 
at an altitude of 1400 meters on Mt. Okagi, near Kiryu, 
Japan, July 26, 1932. 
This ant may have to be regarded as a subspecies of 
picea. It differs, however, from the typical form, the sub- 
species orientalis Ruzsky and the five varieties described 
by him and Forel, in details of coloration and sculpture 
