104 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 97 
epistoma distinctly warped ; cheek 0.22 to 0.30 eye height. Haustellum 
0.8 to 1.5 head height; labella small; palpus bowed, spatulate, 1.5 to 1.75 
as long as third antennal segment, when in normal position extending 
one-third to one-half its length beyond oral margin. Third antennal 
segment two to three times as long as second, its length twice to three 
times width. Lateral postscutellar plates bare. Tarsi longer than 
tibiae; claws in both sexes short. Wing with cell R; narrowly open; Ri 
with setulae to apex, those in the stigmatic section more closely set than 
elsewhere. 
Chaetotawy.—Outer verticals well-developed in both sexes; ocellars 
moderately strong, normally two proclinate frontoorbitals, hind one 
somewhat the weaker; one strong and sometimes one weak reclinate 
frontoorbital; five to eight frontals, of which one or two weak ones 
are located distinctly below and one almost opposite and slightly 
below, antennal base. Presutural acrosticals sometimes absent, more 
commonly one or two pairs present and remote from suture; 3 pre- 
sutural dorsocentrals; hind preintraalar absent or weak; three hu- 
merals; two lateroscutellars, with sometimes an adventitious third; 
no apicoscutellars, except abnormally ; discoscutellars absent, or one or 
two weak pairs present; one short pteropleural; three to five hypo- 
pleurals; three, rarely two, sternopleurals. Prosternum bare. 
Coloration and vestiture—Head mainly yellow in ground color. 
Pollen of frontalia sparse, whitish, distinguishable only from front 
view; that of head otherwise dense, yellowish above, more or less 
whitish below. Parafrontalia bare or with a few scattered black 
hairs; a few black setulae of varying size on facial near vibrissa. First 
and second antennal segments with short black setulae dorsally and 
apically. Palpi yellow, clothed with scattered, very short, sharp, 
black setulae. Thorax black and yellow in ground color, with dense 
whitish to yellowish pollen; black hairs on dorsum, with black and 
soft yellow hairs laterally. Squamae and halteres yellow. Legs 
yellow, tarsi more or less blackish or brown ; coxae with whitish pollen, 
legs otherwise without pollen. Abdomen black-haired above, with 
black and soft yellow hairs below. : 
KEYS TO THE SPECIES OF DEJEANIOPALPUS 
1. Haustellum slender, 1.5 times as long as head height; hairs of arista dis- 
tinctly longer than its maximum diameter___--~ tenuirostris, new species 
Haustellum moderately robust, not so long as head height; hairs of arista no 
longer. than’ its Mmaxintum® diameterl22. 022200. st Oe oe eee 2 
2. Antenna of moderate size, the third segment being about 0.45 head height; 
palpus of female swollen; mesopleura yellow in ground color; abdomen 
largely yellow, the segments with black markings, which are at least nar- 
rowly isolated from those on adjoining segments; first abdominal segment 
math median -maroingls. 22. »Se0A eee lk ak Oe ee 3 
Antenna rather small, the third segment being about 0.35 head height ; palpus 
not swollen in either sex ; mesopleura largely black in ground color; abdomen 
