CERATINA. 
245 
to a musical scale by associating the different species in 
the due gradation of their varying tones. Here we have 
one of the most musical of the tribe,—not a monotonous 
dull sleepy hum, but a fine contralto, the very Patti 
amongst the bees. But it is rapidity of motion which 
in them intensifies the note they chant, and the velo¬ 
city of the flight of this insect is something remarkable. 
They dart about with almost the rapidity of a flash of 
lightning, and this swiftness of approach and retreat 
modulates their accents. 
Under the head “ Macropis ” I have pointed to some 
strong resemblances between this genus and that. 
Genus 13. CEKATINA, Latreille. 
(Plate VII. fig. 3 S ? •) 
Apis **cl 2, a, Kirby. 
Gen. Char. : Head transverse, convex, glabrous; ocelli 
placed in a triangle on the vertex, which is, as well as 
the face, convex ; antennae short, subclavate, each in¬ 
serted in a separate deep cavity in the centre of the face, 
the first joint of the flagellum globose, the second the 
longest of all and slender at its base, but all gradually 
enlarging to the extremity; clypeus very gibbous; la- 
brum quadrate, convex; cibarial apparatus long; tongue 
long and tapering, and with a minute knob at its ex¬ 
tremity ; paraglossae obsolete; labial palpi three-fourths 
as long as the tongue, the two first joints membranous 
and diminishing in width, the second joint rather shorter 
than the basal one and acute at its extremity, and exter¬ 
nally before its termination the two very short terminal 
ones are inserted; labium half the length of the tongue, 
