1863.] 
249 
4—7. 3/y/, In Icurilis the legs are ‘‘all black.” The S abdomi¬ 
nal appendages are entirely different. 
G. ventricosus n. sp. Greenish yellow. Head with the occiput straight, 
except laterally, and in the exact line of the eyes, fringed with black hairs. 
All between the occiput and front black,* tip of the first joint of antennae whit¬ 
ish. Vesicle of vertex straight, transverse, cariniform, suddenly rounded off 
at the sides. Upper surface of the front with a very narrow basal black fascia. 
Central lobe of labium blackish. Back part of head blackish, laterally yellow 
immediately behind the eyes. Prothorax black above, with the anterior and 
posterior lobes, a double spot before the posterior lobe and also a lateral spot, 
all greenish yellow. Dorsum of thorax with its stripes deep black, as in vastus; 
the dorsal carina yellow from its bifurcation almost to its extreme tip, else¬ 
where black. The median stripes confluent, scarcely wider in front, obliquely 
truncate at tip so that their extreme tip just attains the tip of the carina, nar¬ 
rowly confluent behind along the antealar sinus with the humeral; The hume- 
rals confluent throughout with the antehumerals except in front for i their 
length, where the separating yellow line is very narrow, and except also that 
the hind end of the antehumeral separates itself from the two united stripes in 
the form of a large triangular black tooth which does not attain the antealar 
sinus by one millimetre. The two united stripes are nearly twice as wide as the 
united medians and are unabbreviated. Antealar sinus black, yellowish on the 
middle § of its posterior half,* origin of wings blackish; meso- and metathora- 
cic scutels a vivid yellow. Sternum pale dull green, behind dull greenish 
gray. Pleura with a narrow dusky stripe midway between the humeral suture 
and that behind the spiracle, which stripe does not ascend towards the wing 
beyond the spiracle; spiracle blackish. Abdomen black, joints 7—9 greatly di¬ 
lated and widely margined, especially 8, precisely as in G. vastus; joint 1 late¬ 
rally pale dull green and with a large obtrigonate dorsal pale green spot not 
quite attaining the base and tip; 2 laterally pale dull green and with the usual 
trilobate dorsal vitta, which is pale green with a central, unabbreviated longi¬ 
tudinal, yellow line. The remaining joints are marked on the dorsum with 
greenish-yellow as follows:—3—6 with the normal trilobate vitta, a little wider 
than usual, not very acute at tip, and just attaining the subterminal short 
spines of each joint; 7 with a lanceolate very acute vitta extending § of the 
way to the tip, and also with the narrow annulus behind the subterminal spines 
yellowish. Laterally 3—6 have a basal triangular spot, much larger on 3, and 
a faint marginal vitta, all obscure greenish yellow; 7 has the same basal tri¬ 
angle, and also confluent with the triangle an irregular median yellow spot, 
which leaves the terminal ^ of the expanded margin of the joint black; 8 has 
a large unabbreviated yellow vitta which leaves the expanded margin black, 
and 9 has a narrower unabbreviated vitta, which, as well as the margin, is yel¬ 
low. Earlets anteriorly shining black, posteriorly with small black thorns. 
Venter blackish. Abdominal appendages black and hairy. Viewed from above 
the superiors are wide apart at base, twice as long as the last abdominal joint, 
slender, conical, but slightly divaricate, straight, tapering to a long acute point, 
