14 
Targionia Sign. 
Type A. siqnoreti. This seems to be a modification of Aspidiotus s. 
str.j but I have never seen sjiecimeus. 
ODONAsns Leon. 
Type A. secretus. A peculiar oriental type, of uncertain affinities. 
PSEUDAONIDIA n. Sllbg. 
Type A. duplex. Includes also A. thew and A. trilobitiformis. A 
remarkable Asiatic type. The - lattice- work" patch of the 9 is shared 
by the genus Ischnaspis. 
Cryptophyllaspis n. eubg. 
Type A.occultus. A form discovered by Green in Ceylon, living in 
leaf- gal Is on Orewia. 
SSLENA8PIDU8 n. Sllbg. 
Type A. articulatus. Common in the West Indies, but very likely of 
African origin. Its similarity to Aonidiella is but superficial. 
Xkrophilaspis n. snbg. 
Type .1. pro8opidis. An extraordinary little form found in Arizona; 
superficially it recalls Mycetaspis. 
There are some other subgenera indicated by species which I have 
not seen, or have but partially examined. The above need not now be 
discussed in detail; it will suffice to separate them out, so as to leave 
the larger groups fairly homogeneous. 
THE RELATIONSHIPS OF THE RAN JOSE SCALE. 
Having now cleared the way by the separation of the subgenera, we 
can more intelligently discuss the position of the San Jose scale, A.per- 
nict08U8j in the system. P>erlese and Leonardi placed it in Aspiditcs, 
but it is, nevertheless, a Diaspidiotus, as that subgenus is now defined. 
On comparing it with the other species of the subgenus, we arrive 
at some interesting conclusions. It is now to be shown, for the first 
time, that A. pernidosus is, with little or no doubt, a native of Japan. 
For it is in Japan that there occur two varieties or subspecies of per- 
niciosus: andromelas and albopunctatu*. These agree almost exactly in 
structural features with per niciosus, but the first differs markedly in the 
color of the scale; the second slightly in the scale, and more noticeably 
(from an economic point of view) in attacking Citrus. Mr. Alex. Craw, 
however, says (in litt., Feb. 11, 1807): "The only time that I have 
found A, pernidosus on imported stock was from Japan on some apple 
trees, the grafts of which were purchased in America." Mr. Craw has 
examined great quantities of fruit trees from Japan, so it must be 
admitted that his experience carries weight. But there are various 
Japanese scales which Mr. Craw has found only once, and several 
found by Mr. Takahashi on cultivated plants in Japan have not yet 
