396 Mr. F. Swith’s Descriptions 
Supplementary Paper. 
[Read 7th August, 1865. ] 
In addition to the figure and details of Thaumatosoma Duboulan, 
I have added to the Plate some remarkable forms of antennz of 
other species of Aculeate Hymenoptera, and herewith append short 
descriptions of the insects themselves. 
There are two or three known species of bees, the males of 
which have the apical joint of the antenne compressed, so that 
when viewed sideways, as Mr. Kirby remarks, “ it gives them 
somewhat the appearance of those of a Papilio;” such is the 
the antenna of Nomia Kirbi, as will be seen by the figure, but 
this, when viewed from above, appears to be of the ordinary form ; 
in the case of Thaumatosoma it is quite different, and the imitation 
of the antenna of a Papilio is complete; all the joints of the 
flagellum are attenuated and thread-like, except the two apical, 
which are enlarged, and swollen into a knob. 
Fam. MUTILLIDZE. 
Genus PsamMoTHERMA, Latr. 
Psammotherma flabellata. (PI. XXI. fig. 6.) 
Male.—Length 5 lines. 
Black ; strongly punctured ; the prothorax and tegule ferru- 
ginous; the antennz bipectinate ; the wings brown ; the posterior 
margin of the first and second segments of the abdomen narrowly 
edged with white pubescence, the third segment clothed with 
similar pubescence. 
The female has the pro- and meso-thorax entirely red. 
This species of Mutilla is from Senegal. 
Fam. POMPILID &, Leach. 
Genus Crenocrerus, Dahlb. 
Ctenocerus ramosus. (PI. XXI. fig. 4.) 
Male.—Length 3? of an inch. 
Black, the mandibles and labrum ferruginous; the antennz 
ferruginous, with the scape black and furnished beneath with a 
long dense floccus of black hair; the wings yellow and subhya- 
line; the apex of the wings with a dark brown border; the 
neuration pale ferruginous; the anterior tibiz and tarsi ob- 
scurely ferruginous; the head very convex in front; the thorax 
