196 The Philippine Journal of Science 1920 
Luzon, Manila, on bark of ylang ylang tree (coll. Compere 
20146) : Laguna Province, Paete, on Diplocliscus paniculatus 
(coll. McGregor ) . 
Genus SAISSETIA Desplanches 
Three very common and widespread species, members of this 
genus, have been reported from the Philippine Islands, and an- 
other, apparently new, is described herewith. The usually convex 
to hemispherical shape, and the development of a heavily chitin- 
ized and areolated dorsal derm, are the characteristics at pres- 
ent accepted to isolate this genus. 
Key to the Philippine species of Saissetia. 
a 1 . With only about ten to twelve submarginal gland tubercles around the 
body margin; marginal setae more or less flattened and broadened at 
apices; species larger, oval or hemispherical, with or without ridges. 
b \ Female without ridges of any sort in the adult stage, either strongly 
hemispherical or much less convex and oval. 
c 1 . Female strongly convex, hemispherical; color usually yellow brown; 
derm areas oval and often separated by more than their own 
diameter S. hemisphaerica (Targ.). 
c Female at most only moderately convex; nearly black; derm areas 
large, closely approximated, polygonal S. nigra (Nietn.). 
b 2 . Female strongly convex; very dark brown or blackish brown; dorsum 
with distinct ridges in adult, these forming a transverse H-shaped 
mark S. oleae (Bern.). 
a *. With more than forty submarginal gland tubercles around the body 
margin; marginal setas tapering, acute at apices; species small, irreg- 
ularly triangular, not very convex, with three dorsal ridges radiating 
from the center to the corners of the body S. triangularum sp. nov. 
Saissetia hemisphaerica (Targ.). 
Saissetia hemisphaerica (Targ.), Robinson, Philip. Journ. Sci. § D 
12 ( 1917 ) 14 . 
To the records given by Miss 
Robinson, the following may be 
added : 
Luzon, Manila, on Chrysophyl- 
lum cainito (10074), on unknown 
host (10218), on Thunbergia gran- 
diflora (16666), on Cycas revoluta 
(18463) all collected by Banks, on 
ornamental vine (coll. Baker 
10100) : Rizal Province, Pasay, on 
Coffea arabica and Tabernaemon- 
tana pandacaqui (coll. McGregor ) . 
Fig. 37. Saissetia hemisphaerica (Targ.), 
adult female, showing derm areola- 
tion, marginal and spiracular spines, 
X 165. 
