222 
Psyche 
[September 
Pygidium with two paramedian setae and one large paralateral seta 
on each side, plus a variable number of microsetae; fine median 
longitudinal striae lacking; margin of pygidium entire in both sexes. 
Male genitalia. Parameres subequal, slightly asymmetric, slender, 
with one to three setae near apex. Median lobe nearly symmetric; 
base non-lobate; median lobe not markedly constricted sub-basally; 
apical third neither compressed nor strongly bent downward, the apex 
strongly produced in American species. Internal sac doubly invagi- 
nated (or telescoped), with a pair of basal sclerites of variable 
form ; apical brush lacking conspicuous spines, sclerites, or setae 
(American species) or with a large number of dorso-apical seta-like 
scales. 
Immature stages. See Vinson (1956). 
KEY TO THE SPECIES OF HALOCORYZA 
i. Pronotum without submedian carinae; basal diameter of 
median lobe of male genitalia more than 0.65 ventral length, 
apex not produced. Old World maindroni , jeanneli. 
Pronotum with submedian longitudinal carinae; basal di- 
ameter of median lobe of male genitalia less than 0.65 ventral 
length, apex more or less produced. New World 2. 
2(1). Smaller species (LE, 1 .20-1.35 mm.); pale testaceus; prono- 
tum distinctly transverse (LP/WP less than 0.95) ; pronotal 
carinae weakly developed, separated by less than 0.1 WP; 
elytra sparsely setose, interval three with 10 or fewer setae; 
basal diameter of median lobe of male genitalia more than 
0.5 ventral length, apex of median lobe acute in lateral view. 
Pacific coast of Mexico acapulcana. 
Larger species (LE, 1.35- 1.45 mm.) ; dark testaceus; pro- 
notum not distinctly transverse (LP/WP more than 0.95) ; 
pronotal carinae sharply raised and separated by more than 
0.1 WP; elytra densely setose, interval three with more than 
10 setae; basal diameter of median lobe of male genitalia less 
than 0.5 ventral length, apex of median lobe broadly truncate. 
West Indies arenaria. 
Halocoryza acapulcana Whitehead, new species 
Phis is the only Halocoryza so far known from North America. 
From the West Indian H. arenaria , it is readily distinguished by its 
smaller size, more transverse pronotum, less sharply elevated and 
