20 Rev. T’. A. Marshall’s Monograph of 
piceous ; terebra only slightly exserted. Body black, with pale 
pubescence ; palpi dusky; mandibles rufous. ¢ 9 Antenne a 
little longer than the body, about 25-jointed. Mesonotum some- 
what flattened, impressed with a medial faint longitudinal channel 
not reaching the fore border ; furrow of the mesopleure wanting ; 
metathorax densely pubescent, short, rugulose. Wings hyaline ; 
squamulz brownish ; nervures and stigma pale in the 2, black in 
the ¢ ; stigma much attenuated, extending ever two-thirds of the 
radial areolet ; this latter is longer than the prebrachial areolet, 
and a trifle more remote from the tip of the wing than in sp. 24 ; 
radial nervure rather stout, curved and sinuated before the 
extremity ; recurrent nervure interstitial. Legs rufous; coxe, 
base of the trochanters, upper edge of the 4 posterior femora, tips 
of the hind tibiz, and the hind tarsi, often infuscated. Abdomen 
like that of sp. 24, but not pale at the apex. Terebra concealed 
or slightly exserted. Length, $-1 line ; exp., 24-3 lines. 
Variable, not only as to size, but also in the colour of 
the palpi, mandibles, and legs, which are more or less 
dark in the smaller examples, more clearly rufous in the 
larger. Many seem to be intermediate between this 
species and the preceding, so that it is hard to say, 
among the great number | possess, to which they ought 
to be referred. It may be also remarked that the radial 
areolet varies in length, and the stigma exhibits different 
degrees of attenuation, but the general resemblance of all 
these equally abundant forms is too intimate to admit a 
doubt of their specific identity. They are probably 
widely dispersed in cold and temperate regions, where 
they show themselves in the earliest days of spring. 
T’orster has made of them another genus, Rhizarcha. 
26. Dacnusa clandestina, Hal. 
D. clandestina, Hal., Hym. Brit., ii., p. 14; Marsh., 
lab. cit., p. 492, 2. 
Stigma somewhat shorter, emitting the radial nervure before 
one-fourth of its length, and dilated at the anastomosis ; abdomen 
blackish, the segments cinctured with pale yellowish ; terebra half 
as long as the abdomen. @ Black, pubescent ; head large, wider 
than the thorax, piceous with paler cheeks ; mandibles ferruginous, 
dark at the points ; palpi elongate, pale testaceous. Thorax oval ; 
mesonotum impressed with a longitudinal smooth channel not 
reaching th fore border ; mesopleure without a furrow ; meta- 
