new genus of Hymenopterous insects. 389 
removes it from the families to which those genera 
belong. Its nearest allies are most probably to be 
found in the Scoliide, to which family the trispinose apex 
of the male abdomen lends a strong approximation. The 
female, when discovered, will doubtless differ so much 
from the male as to lead the discoverer at first to regard 
the insect of that sex as a distinct genus. 
P.S.—In Gay’s ‘ Historia de Chile,’ tom. sesto, p. 305, 
a genus is described, in Spanish, by the Marquis Spinola, 
under the name of Chestus, which may possibly be 
identical with the one above described. A short generic 
as well as specific Latin diagnosis is given, which are 
either inaccurate or cannot apply to our insect. The 
generic description is, ‘‘ Antenne corpori sublongitudine, 
duodecitm articulate. Mandibule breves. Thorax tri- 
partitus, regionis propriz nervuri obliterati.” Chestus 
Gayi, pl. 3, fig. 8. C. antennis, capite, thorace, pedi- 
busque nigris; abdomine pilis fulvis; alis hyalinis, 
nervuris testaceis aut fulvis. Long. 5 lin.; lat. 2 lin. 
It is placed in the family Mutillide, near the Thynnides, 
and it is suggested that it may be the male of the genus 
Bradynobenus, which has entirely the habit of a female 
Mutilla. 
EXPLANATION OF PuatEe XVI. 
Fie. 1. Dyscolesthes canus, magnified. 
2. Hind leg of ditto. 
. Fore leg of ditto. 
. Spur of anterior tibia. 
. Antenna. 
. Tarsal ungues. 
. Maxille, labium and palpi. 
. Head, seen from above. 
. Base of hind wing. 
. Base of fore wing. 
coe monNnton B& oO 
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