VI. POMPILUS. 5y 
sprinkled with a few rigid seta, as well as the exterior of the 
base of the mandibles, which are rufescent in the middle, black 
at base and apex, the teeth at equal distances and the apical one 
obtuse. 
The thorax gibbous; the metathorax with a slight central 
abbreviated impressed line deeper at the base; the scutellum 
forming a truncated triangle; the wings clouded with a broad 
dark margin at the outer edge, extending inwards to the apex of 
the marginal and third submarginal cell, which is triangular and 
frequently petiolated ; the legs with a single row of slight spines 
on the exterior of the anterior tibize and tarsi, the coxz of the 
intermediate and posterior ones covered on the outside with a 
silvery down, and their tibiz and plantee with a double row of 
slight spines, and the remaining joints of the tarsi with spines at 
their apex. 
The abdomen with a very slight whitish reflection at the base 
of the segments from the second and the apical one pilose. 
The ¢ differs in having the face covered with a silvery pubes- 
cence as well as the metathorax, which is less gibbous; the legs 
spinose. The abdomen with the fourth ventral segment slightly 
and the fifth profoundly emarginate, with a longitudinal depres- 
sion in their centre. 
3 @ in my own and other Cabinets. 
{4+ Vander Linden thinks this species may possibly be a 
mere black variety of the P. viaticus ; which appears proba- 
ble at the first suggestion, but which inspection proves cannot 
be the case, for in the first place it is always considerably 
smaller, and the mandibles in the P. niger are but slightly 
arcuate, very broad, and the teeth nearly equal, whereas in 
P. viaticus they are very arcuate and the apical tooth con- 
siderably longer than the others; the coxe also are of an 
opaque black in the latter, and the spines of the legs pro- 
portionately stronger, as well as the head and thorax being 
densely pilose. 
