new Genera of Ichneumonide. 277 
defined ; the central space is bordered by keels; from the 
side of the smooth basal space a stout curved keel runs to join 
the apex of the prolongation of the smooth part. The 
spiracular area is separated from the pleure by a distinct 
keel. Propleure closely punctured, the apex in the middle 
stoutly striated ; the lower part projects, is there smooth, but 
above the smooth projection it is roundly hollowed and stoutly 
perpendicularly striolated. The tubercles form an elongated, 
narrow, sharp projection under the tegule, and are longer 
than them, extending from the base to the apex of the pleure ; 
the space immediately underneath them stoutly, slightly 
obliquely striated, all the strize distinctly separated; the rest 
of the pleuree with shallow punctures, except on the middle 
behind; the lower part behind immediately over the hind 
cox roughly irregularly striolated; the metapleure closely 
punctured, less strongly behind, separated from the sternum 
by a stout keel, the part immediately over the keel being 
crenulated. Legs coloured like the thorax, except that the 
apical two joints of the hinder tarsi are black. Petiole 
stoutly striated down the middle, the sides, especially at the 
apex, strongly punctured ; the other segments except the last 
strongly, closely, longitudinally striolated. Gastrocceli trans- 
verse, deep, smooth, except in front of the middle, where 
they are striolated. 
DIMATHA, gen. nov. 
Antenne short, flattened and compressed beyond the middle. 
Labrum distinctly projecting. Scutellum flat, sloping down- 
wards from the middle towards the apex, its sides stoutly 
keeled on the basal half. Median segment with one large 
central, one lateral, and the spiracular are clearly defined. 
Wings large, with an apical cloud ; the areolet oblique, four- 
sided; the transverse cubital nervures united on the top. 
Abdomen with seven segments and with a ventral fold on the 
second, third, and fourth, the dorsal segments closely punc- 
tured; the sides of the segments not angled. The hinder 
femora reach to the apex of the third segment. 
This genus belongs to the Hemijoppine, but does not fit 
well into either of the sections into which Kriechbaumer 
divides the group. In the male the antenne are much longer 
and serrate. Comparing Dimetha with Gathetus, it may be 
readily distinguished by not having the abdominal segments 
longitudinally striated, by the petiole being longer, by the 
postpetiole being narrower and shorter than the narrowed 
basal portion, the abdominal segments do not project so much 
at the apices, the scutellum is not so flat, and the hinder tarsi 
are much longer compared with the tibie. 
