1966] 
Evans — Neotropical Pompilidae 
121 
three long comb-spines and a shorter one basad of these. Marginal 
cell removed from wing tip by a distance equal to 1.85 times the 
length of the marginal cell; third submarginal cell narrowed by 
three-fourths above, but not triangular. 
Remarks. — This large and well characterized species is known 
only from the type. It was collected at the same time and place as 
a long series of Pompilus ( Arachnospila) dichromorphus (Rohwer), 
to which it bears a strong superficial resemblance. 
3. Aridestus jaffueli (Herbst) new combination 
Pompilus jaffueli Herbst, 1923, Revista Chilena Hist. Nat., 25: 150. [Type: 
$, chile: Marga Marga, Prov. Valparaiso, Jan. 15, 1919 (F. Jaffuel) 
(MCZ, No. 17,184)]. 
Female. — Length 7-9 mm; fore wing 6-7 mm. Head and thorax 
black, the dorsum rendered somewhat bluish by the pubescence, with 
an extensive pattern of silvery pubescence as follows : sides of clypeus, 
a streak along the inner orbits and also up the median frontal sulcus, 
temples, all coxae, propleura, pronotum anteriorly and along the 
posterior margin, posterior margin of mesoscutum, sides of scutellum, 
metanotum, and most of the propodeum and pleura; abdomen rufous, 
extreme tip sometimes infuscated, clothed with fine, pale pubescence; 
wings lightly infuscated, with a broad darker band along the outer 
margin of the fore wing. Front with short, dark hairs; clypeus and 
scape with a few hairs; temples and propleura clothed with pale 
hairs. Clypeus 2. 3-2. 5 times as wide as high, truncate apically. 
Front narrow, middle interocular distance .53-. 55 times transfacial 
distance; upper interocular distance .84-. 90 times lower interocular, 
the inner orbits thus somewhat more distinctly convergent above than 
in bergi. POL subequal to or slightly exceeding OOL. Third an- 
tennal segment 2. 5-3.0 times as long as thick, equal to .55-. 64 times 
upper interocular distance. Median impression of propodeum nearly 
complete, the propodeum completely without transverse rugae. Front 
basitarsus with three strong comb-spines, sometimes with a weak 
fourth spine basad of these. Third submarginal cell subtriangular. 
Male. — Length 5.0-7. 5 mm; fore wing 4. 2-6.0 mm. Coloration 
of body, wings, and pubescence much as in the female except for 
the usual pale yellow markings on the pronotum and tip of the 
abdomen ; abdomen almost wholly rufous and covered with a fine, 
pale pubescence; subgenital plate black; scape with some dark hairs 
beneath, clypeus, front, and vertex also more conspicuously hairy than 
in the female. Clypeus 2. 1-2.2 times as wide as high. Front nar- 
row, middle interocular distance .56 times transfacial distance; mid- 
dle interocular distance 1.15-1.20 times lower interocular; upper 
