260 The Philippine Journal of Science 1921 
the genal cones of the Triozinz, early become apparent in the 
immature forms. A thorough study of these preadult stages 
may result in a more reliable establishment of the true system- 
atic position of some anomalous genera, or be of help in distin- 
guishing certain apparently closely related groups which 
hitherto have been difficult to separate. In the present paper 
descriptions of a few of the nymphal instars and their habits 
are included, and it is hoped that further collecting and field 
observations may lead to the accumulation of sufficient material 
for a more adequate treatise on this phase of the subject. 
Subfamily LIVIINA& Low 
Tribe APHALARINI (Low) 
Genus HAPLAPHALARA novum 
Head very slightly declivous; vertex less than one-half as wide 
as long, flat; gence roundly swollen ventrad to antennal tubercles ; 
-frons visible as a short sclerite-bearing anterior ocellus; eyes 
subglobose, prominent; anterior ocellus visible only from cephalic 
aspect of head; posterior ocelli not elevated; clypeus large; 
antennz slender, not much longer than width of head. Thorax 
searcely arched, slightly thicker than abdomen; pronotum nearly 
half as long as vertex, not depressed below level of latter, 
terminating laterad almost at level of eyes in a knoblike 
process; mesoprescutum about three times as long as pronotum; 
legs moderately long and slender; eight distal spines on hind 
tibiee; meracanthi over twice as long as thickness at base; 
forewings subelliptical, rounded at apex, more or less maculated, 
subequal in length to body, nearly twice as long as wide; 
pterostigma large, open proximad. Abdomen slightly shorter 
than thorax. 
Male.—Anal valve slightly longer than genital forceps, both 
without process. Genital segment roundly produced ventrad 
below level of adjacent proximal sternite. 
Female.—Anal valve about as long as the rest of abdomen; 
ventral valve shorter than dorsal; both without process. 
Type of the genus, Haplaphalara dahli (Riibsaamen). 
The genus is very closely allied to Aphalara Forster, as 
recharacterized by Crawford (’14:24), resembling the latter 
in many characters. The following characters, howover, dis- 
tinguish it from Aphalara: Longer mesoprescutum in proportion 
to pronotum; absence of spines on basal tarsi of hind legs; 
presence of pterostigma; and absence of posterior lobe on male 
anal valve. The last two characters, according to Crawford, 
