1973 ] 
Evans — Neotropical Pompilidae 
217 
Description. — Length 8.4 mm; fore wing 7.4 mm. Head light 
rufous, with a pair of black spots on upper front ; front and temples 
with a reticulate pattern of white; malar space, mandibles, and 
lab rum mostly white; thoracic dorsum mainly light rufous, sides with 
broad streaks of light rufous and white, also some black on posterior 
parts of mesopleura and metapleura ; propodeum white, with a pair 
of broad, longitudinal black bands ; abdomen mainly whitish or some- 
what cream in color, tergite 1 with a small amount of black latero- 
basally and medioapically, tergites 2-5 with much black basally, ter- 
gite 6 mostly pale; venter mostly pale, but all pale markings of 
abdomen irregularly tinged with brown ; antennae stramineous and 
partially infuscated on basal 0.3, again at basal vein, this band con- 
nected through the first submarginal cell with another band partially 
crossing the wing at the second submarginal ; hind wings hyaline. 
Body with pale, inconspicuous pubescence; erect setae absent except 
on clypeus, mouthparts, venter and apex of abdomen. 
Clypeus 3 X as wide as high, its apical margin sinuate, with a 
broadly rounded median lobe; front broad, middle interocular dis- 
tance .60 X head width ; upper interocular distance .70 X lower 
interocular distance; vertex very weakly arched between eye tops, 
subcarinate behind ocelli; postocellar line: ocello-ocular line = 4:5; 
antennae very slender, third segment 6.6 X as long as its apical 
width, 1.2 X upper interocular distance (Fig. 1). Pronotum rather 
flat dorsally, its posterior margin broadly angulate; postnotum 
widened at the midline; wing venation shown in Fig. 2. 
Mystacagenia bellula, new species 
H'olotype. — $, Avispas, 30 mi. from Marcapata, 'Cusco, Peru, 
1 -1 5 Oct. 1962 (Luis Pena) [Coll H. K. Townes, Ann Arbor, 
Mich.]. 
Description. — Length 6.2 mm; fore wing 4.7 mm. Head testa- 
ceous to somewhat orange, with small dark blotches at center of 
inner eye margins and a larger dark blotch in front of anterior 
ocellus; temples, malar space, and area below antennal sockets more 
or less white; mandibles, labrum, and palpi white; thorax and pro- 
podeum rufous except propleura and anterior corners of pronotum 
white; abdomen dark brown except all of segments 1 and 6 and much 
of sternite 5 contrastingly white; scape white, flagellum white on 
basal half, testaceous on apical half, streaked with fuscous on lower 
surface throughout; legs white, with a complex pattern of dark 
brown and a small amount of rufous at base of middle and hind 
