174 
Transactions of the Boyal Society of South Africa. 
Gen. SYNHOEIA, Kolb., 
Kaf. Deutsch.-Ost. Afrikas, 1897, p. 256. 
Arrow., Ann. and Mag. Nat. Hist., 8 ser., vol. ii., 1908, p. 204. 
Mentum extremely narrow, transverse, palpigers broad, strongly- 
developed, ligula nearly transverse, very short, briefly pubescent along 
the margin, labial palps very long, the intermediate one longer than the 
first and third taken together; maxillae very short, the lower lobe sup- 
ported by a broad and short palpiger is hardly distinguishable, the upper 
lobe is slender, fasciculate at the tip, slightly so inwardly, and projects 
very little beyond the basal joint of the maxillary palps the joints of 
which with the exception of the basal are very long, the apical one 
being somewhat fusiform and slightly truncate at tip ; mandibles very 
robust, long ( $ ) or very long arcuate and each provided with a 
sharp, malar tooth ; labrum rudimentary ; head declivous, transverse, 
very broad or broad according to sexes, epistome very narrow, eyes large, 
sub-reniform, antennae short, basal joint massive, knobby at tip, second 
smaller than the first but also knobby and more robust than the following 
ones, the first five of which are sub-turbinate, the others are slightly com- 
pressed, longer than broad, the last one being longer than the penultimate ; 
prothorax twice as broad as long ; scutellum very broad, acuminate at 
apex, rounded there ; elytra elongate, as broad as the prothorax at the 
base, little convex, singly rounded at apex ; legs compressed, moderately 
slender, tibiae with very small spurs, tarsi long, hispidous underneath, 
claws robust, the upper side also robust, pectinate, but slender and simple 
at the hooked part, the lower filiform, not spatulate at tip. 
The S' differs from the $ in the very great development of the head 
and mandibles, the latter being longer than the head, which is broader 
than the prothorax, and has on each side of the base a conspicuous callus- 
like process, and underneath close to the point of insertion of the antennae 
a vertical, conspicuous tooth ; the ligula has on each side a short, acute 
membranous lobe wanting in the $ , in which sex the head is narrower 
than the prothorax, the labrum is more distinct, the eyes are more 
developed underneath ; the mandibles are also projecting but do not 
compare in size with those of the <^ , and the elytra are nearly parallel 
laterally, whereas they are strongly sinuate past the middle in the ^ . 
Found in the nests of several species of Carpenter Bees belongiog to 
the genus Xylocopa. When captured these insects exude at the knees a 
considerable quantity of yellowish fluid. 
Key to the Species. 
A^. Prothorax with a deep discoidal impression on each side ; punctures on 
the upper side deep, very closely set ; posterior angles of the head bulg- 
ing out in the male 
hottentota. 
