1973 ] 
Evans — Neotropical Pompilidae 
221 
ocello-ocular line = 2 :5 ; in lateral view, distance from eye tops to 
vertex crest .7 X eye height, temples about 1.5 X eye width; third 
antennal segment 4.3 X as long as wide, equal to slightly less than 
half upper interocular distance. Maximum width of thorax only .7 
that of head ; pronotum weakly expanded dorsally, its midline de- 
pressed. Wing venation as in female; terminalia as figured (Figs. 
8, 9) ; lateral view of body shown in Fig. 10. 
Allotype. — 9 ) same data as type except dated 3 July 1971 [Mus. 
Comp. Zool.]. 
Description of female allotype. — Length 10 mm; fore wing 
8 mm. Head, thorax, and propodeum dark brown, somewhat shin- 
ing; abdomen rufous except base of first segment black; antennae 
dark brown; coxae, trochanters, and tarsi dark brown, femora and 
tibiae rufous. Wings tinged with yellowish brown; stigma light 
brown. Pubescence cinereous to light brown, rather conspicuous on 
coxae, pleura, and propodeum. Body with fairly numerous pale, 
erect hairs, including some on thoracic dorsum and pleura, pro- 
podeum, coxae, and especially the abdominal venter; hind femora 
with scattered short hairs. 
Clypeus 2.5 X as wide as high, its apical margin weakly concave; 
middle interocular distance .63 X 'head width, 1.1 X eye height; 
upper interocular distance very slightly exceeding lower interocular 
distance; vertex broadly rounded off well above eye tops, distance 
from posterior ocelli to top of vertex exceeding postocellar line; 
postocellar line : ocello-ocular line — 2:5; temples strong, although 
roundly contracted from behind the eyes, in lateral view not quite 
as wide as eyes ; antennae not especially elongate, third segment only 
about half the upper interocular distance. Maximum width of thorax 
only slightly less than that of head ; features of pronotum and post- 
notum as described for male ; wing venation as in Fig. 4 ; legs and 
abdomen as described under generic heading. 
Paratypes. — 2 9 ?> same data as allotype [U.S. Nat. Mus., Brit- 
ish Mus.]. 
Variation. — Both paratypes are slightly smaller than the allotype 
(fore wing 7.3, 7.5 mm) but there are no differences worthy of note. 
Remarks. — Despite the great difference in head structure in the 
two sexes, there is close agreement in all other essential features, 
and there can be no question that these are male and female of one 
species. This is the only case known to me in the Pompilidae in 
which sexual dimorphism involves a major difference in head size. 
In this connection the following notes provided by Martin G. 
