260 
The Philippine Journal of Science 
1921 
the genal cones of the Triozinse, 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 LIVIIN^E Low 
Tribe APHALARINI (Low) 
Genus HAPLAPHALARA novum 
Head very slightly declivous ; vertex less than one-half as wide 
as long, flat ; gense 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; 
antennae slender, not much longer than width of head. Thorax 
scarcely 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 ; mesopraescutum about three times as long as pronotum ; 
legs moderately long and slender; eight distal spines on hind 
tibiae; 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 mesopraescutum 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, 
