166 The Philippine Journal of Science 1920 
nacoccus mangiferae Green, described from Ceylon, and Mr. 
Green, who has very kindly compared specimens with some of his 
material from Ceylon, states that it is identical with specimens 
which he has collected in Ceylon. In addition to the records 
given by Miss Robinson, I have examined specimens as follows: 
Luzon, Manila, on “wild plants” (Compere 20194), “wild 
grass” (Compere 20233): Bulacan Province, Baliuag, on Ta- 
bernaemontana sp. (coll. Arce 2619); Katagpo, on Antidesma 
leptocladum (coll. Arce 2609) ; Quingua, on Antidesma leptocla- 
dum (coll. Arce 2615): Rizal Province, Balintauac, on Mangi- 
fera indica (coll. Arce 2599). 
The accompanying figures and the characters given in the 
key should be sufficient to make this species recognizable. 
Genus SYNACANTHOCOCCUS novum 
Antenne, legs, and mouth parts normally developed, the first 
9-segmented in the adult female; claw of legs with a denticle 
beneath before apex; body with pairs of large, stout, triangular 
spines on both dorsum and margin; dorsally with triangular 
gland pores, large short-tubular ducts, and large, flat, circular 
disk pores; ventrally with the large disk pores last mentioned, 
with quinquelocular disk pores, and with minute tubular ducts, 
with threadlike continuation of the bottom of each; otherwise 
- characteristic of pseudococcine forms. 
Type of genus, Synacanthococcus bispinosus sp. nov. 
Judging from a study of such descriptions, figures, and spec- 
imens of related species as are available, this new genus is possi- 
bly more closely related to Tylococcus Newst. than to any other 
described genus. The presence of the dorsal spines in all stages, 
of the female at least, would indicate a position in the eriococcine 
group of genera for this genus, according to the older ideas of 
classification, but it is obviously a pseudococcine form. 
Synacanthococcus bispinosus sp. nov. 
Adult female.—All of the material studied preserved in liquid 
at one time, and external secretion therefore wanting; occurring 
on small twigs of the host; the denuded forms, after preservation 
in liquid and subsequent drying out, clay yellow in color; 
maximum length, mounted on a slide, a little more than 2 
millimeters; maximum width, nearly 1 millimeter; elongate oval, 
broadest a little behind the middle; not giving off any appreciable 
color or stain when boiled in caustic potash; antennz normally 
9-segmented, the joint between the last two segments only slightly 
