Relations of Bunops in the Family Macrothricidce. 389 
•single and much nearer the proximal sense-hair, than in 
Bunops. In Guernella , the antennules are short and broad, al¬ 
most barrel-shaped, and covered with spines. Those of Grimal¬ 
dina are long, and the genus resembles Bunops in head, general 
form, and post-abdomen. 
ANTENNiE. 
The setae of the ventral branch of the antennae vary in num¬ 
ber. There are three sets. Those of the dorsal branch are con¬ 
stant in number. 
3-0-0-0 
"3TT 
Setae of Antennae 
3-1-0-0 
3-1-1 
j 3-1-1-0 
3-1-1 
Drepanothrix. 
Ilyocryptus. 
Acantholeberis. 
j Ophryoxus. 
Bunops. 
C Streblocerus. 
-j Macrothrix. 
( Grimaldina. 
Lathonura. 
Guernella. 
'Character of prox¬ 
imal seta of 
ventral branch. 
Seta large and stiff. 
Joint anchylosed,but 
joint slender. 
Seta jointed and 
flexible. 
C Macrothrix. 
-j Drepanothrix. 
( Grimaldina. 
Bunops. 
Ophryoxus. 
C Ilyocryptus. 
-J Lathonura. 
(_ Guernella. 
In number and character of the setae Bunops is most like 
Ophryoxus. 
The enlargement and stiffening of the basal seta of the ven¬ 
tral ramus of the antennae is a wide-spread character of the 
family. Correlated with the development of this structure goes 
a loss of the plumose character of the seta, and a development 
of short spinules or a sparse covering of hairs. In these or- 
