ore ere. 
Merwe 
PB an boots om 
1914] A Structural Study of Caterpillars. Gh 
fibre piercing the nervous system, and no short dorsal anterior 
muscles, though it was probably such a muscle ventrally, that 
gave rise to p’, which is wholly independent of p and x, though 
not well marked in Cossus and Malacosoma. In the abdomen 
the principal nerve divides the ventral muscles quite centrally, 
forming the most satisfactory distinguishing character between 
the fibres f and g, and forming the most fundamental dis- 
tinction between a and the other recti; the relation of the 
dorsal muscles is more obscure, as the nerve divides up, but 
A, B and C evidently lie above, and E, F and H below it. 
The transverse muscles are divided into two groups as already 
noted in the case of the thorax. The following classification 
of the muscles gives their designation by Lyonet, Lubbock 
and Berlese. 
LYONET LUBBOCK BERLESE 
LONGITUDINAL DORSAL 
Rectus A 1 VII 
B 3 is 
C 2 : 
Segmental D 4 $ 
5 “ 
From antecosta, oblique F(4) 8 xX 
7 “ 
From antecosta to antecosta E 6 IX 
From precosta if 9 XI 
L 10, 11 & 
From intercosta OR 12) 15 XVI 
LONGITUDINAL VENTRAL, SUPRANEURAL. 
Rectus ce 18 2 
b 17 * 
d(3) 16 iS 
Antecostal, oblique f’ (in Malacosoma only) 
Longitudinal segmental e 20 2 
ff 19 £ 
To antecosta of following segment f 25 IV 
From antecosta, oblique h a 
LONGITUDINAL VENTRAL, SUBNEURAL. 
Antecosta to antecosta, longitudinal a 21 III 
299 
To antecosta of following segment, 
oblique g 24 IV 
Segmental, oblique g’ 25 2 
From front of leg k 27 1 aa 
From near midventral line, between legs p 28-30 la 
From posterior side of leg t 57 V 
From leg toward mid-ventral line x 56, 58 laB (1) 
From near mid-ventral line to leg (p’) 46 (part) lap 
SPIRACULAR M 45 
TRANSVERSE SUPRATRACHEAL. 
Acrosternal tf) 3 XVII 
At precosta a(2) 36 ¢ 
