6 Rev. T. A. Marshall’s Monograph of 
enclosing a triangular space ; tubercles not prominent ; the following 
segments form together a short oval, smooth and shining. 'Terebra 
concealed. ¢ similar; antenne longer; Ist segment sublinear, 
scarcely wider behind; the following segments oblong, longer 
than those of the @. Length, 1-13 lines; exp., 2-3 lines. 
Haliday seems to have confused this species with the 
following, especially in his account of the antennex, taking 
the number of joints from D. tristis, and the length from D. 
ampliator, whereby the description is rendered doubtful. 
According to Haliday the number of joints ¢ 2 is 21-23; 
according to Nees it is 24-25 for the 2, the ¢ not being 
mentioned. As to length, the antennz f are shorter 
than the body, according to Haliday, while those of the ? 
are hardly longer than the head and thorax ; a character 
belonging only to the following species. D. tristis is 
common in England; Goureau states it to be a parasite 
of the dipteron Agromyza niyripes, Macq.; and it 1s in- 
cluded by Giraud in his list of observed cases of para- 
sitism, where it is reported to have issued from galls 
made by some dipterous insect on the roots of Artemisia 
campestris. D. lugens, Hal. (Hym. Brit., 11., p. 26), from 
Norway (Hammerfest), is a closely allied species, if not 
the same. 
7. Dacnusa ampliator, Nees. (PI. 1., figs. i, 1a.) 
D8, d Se ; Dz 
8, 2 2 nec 
Alysia ampliator, Nees, Mon., i., p. 2 
ampliator, Marsh., lib. cit., p. 46 
Haliday). 
Antenne ? not longer than the head and thorax, 15-17-jointed ; 
those of the ¢ not quite as long as the body, 21-jointed. Q Form 
short and stout ; deep black, shining, with whitish pubescence ; 
palpi dusky ; mandibles reddish. Head large, transverse, wider 
than the thorax ; face covered with whitish down; front exca- 
vated, with a minute fovea at the bottom of the hollow. Antennz 
moniliform after the 7th joint, incrassated towards the extremity, 
the extremity itself being slender. Mesothoracic furrows hardly 
inchoate ; no fovea, nor channel, before the scutellum ; meta- 
thorax very short, not shining, covered with whitish down, verti- 
cally truncate behind ; a transverse carina separates the horizontal 
from the vertical surface, the former of which is again divided 
into two compartments by a longitudinal carina. Wings whitish, 
almost lacteous ; nervures and stigma testaceous or pale brown, 
