523 
Descriptions of Nevj Sphegidae 
lights are bright silvery with a slight golden tinge. Vertex very 
closely and exceedingly finely punctured. Thorax very densely 
clothed all over with erect hairs, its sculpture hidden except on 
the mesopleurae, which are rugosely punctured. Wings slightly 
dusky, nervures piceous, tegulae pale testaceous, front metatarsus 
with four pale short spines along its outer edge, and two at its apex, 
tibiae with a few feeble spines, calcaria pale. Propodeum with a 
smooth shining impressed central line ; punctured above and at 
the sides, but so densely clothed with hairs that the sculpture is 
mostly hidden. Abdomen clothed with adpressed sericeous pube¬ 
scence, in certain (lateral) lights forming wide apical silvery-golden 
bands, viewed from in front and in other lights, apparently covered 
entirely with silvery-golden hairs, each change of position causing 
a difference in the apparent arrangement of lighter and darker 
hairs, apical valve rufescent. Segments beneath shining, black, 
punctured, their apices testaceous. 
Long. 6-9 mm. 
[Biskra, 25. iv, 97. A. E. E. Coll. Saunders.] 
7. Tachytes maculicornis, n. sp. 
Nigra argenteo-pubescens, mandibulis piceis, palpis alarumque 
nervis laete testaceis, tegulis pallidis, valvula anali pilis argenteis 
tecta. Maris antennae articulis 4-6 dilatatis et pallidis, 7-8 
pallido-notatis : metatarsi intermedii apice valde spinoso producti. 
^ 9 • Black clothed with silvery pubescence ; mandibles dai’k 
piceous ; palpi tarsi and wing-nervures bright testaceous; tegulae 
pale. Antennae in the ^ with joints 3 to 8 of the flagellum beneath 
each with a conspicuous pale ochreous spot (that of the 8th only 
occupying its extreme base). Apical dorsal valve in both sexes 
clothed with silvery hairs. 
This species agrees closely with freygessneri in the 
proportions of the vertex and antennae, and in the $ is 
hardly to be distinguished from the latter except by its very 
different coloration and more abundant silvery pubescence. 
The ^ however presents most unusual characters. Its 
antennae have joints 4, 5, 6 of the flagellum dilated—the 
dilatation being widest at the base of each joint, which 
therefore projects beyond the apex of the preceding one. 
These three dilated joints are almost entirely pale ochreous 
beneath, their apices only being narrowly black. The 
third joint, though not dilated, is a trifle thickened and 
pale beneath. Joints 7 and 8 are noi'inal except for their 
TRANS. ENT. SOC. LOND. 1910.— PART IV. (DEC.) M M 
