114 Annals Entomological Society of America  [Vol. VII, 
LYONET : LUBBOCK BERLESE 
Meso-. Meta-. Meso-. Meta-. 
ACROSS PLEUROSTERNAL LINE 
Intercostal region to leg 6,0 e, 6,0 46, 51 5a (3) 
Posterior incisure to leg t t 55 XVIIB (8) 
Superficial on incisure 0 ) 35 XXXVI XVIIa 
Deep on incisure x x 34,38 XXXVla XVIIIa 
BELOW PLEUROSTERNAL LINE 
To leg Ss Ss 78 Ila, 6a 
To near midventral line p Pp 73-75 
SPIRACULAR (rudiment) 1 
Notes: (1) Muscles droits of Lyonet. 
3) Fig. 478. 
4) Certainly derived from longitudinal muscles like k. In the meso- 
thorax it tends to cross the middle line. 
+ Indicates that the muscle is represented but not named. 
( 
(2) Passing between the two longitudinal connectives. 
( 
( 
The wing is shown in the deepest layer of the dissection on 
Plate XVIII, in its normal position. The only fibres closely 
associated with it seem to belong to w and X, practically all the 
pleural muscles being inserted far above it. Evidently the 
pleurites are very slightly developed in the caterpillar stage. 
The mesothorax seems to differ from the metathorax as 
figured only in having a fibre or two more or less in the case 
of such homologous muscles as a, b, (d); 6; Q. R. S and T. 
The union between thorax and abdomen is made with only a 
single disturbance of the musculature, aside from the fact that 
the ante- and precosta of the first segment of the abdomen 
are undeveloped; and that is that one head each of E and F 
have moved forward a short distance beyond the incisure, 
carrying with them a couple of fibres of 0, and attaching 
themselves to the insertions of G and t respectively. . 
MIDDLE SEGMENTS OF ABDOMEN. 
One of the middle segments may be taken as typical of the 
abdomen. Examples of three families are figured on Plates 
XX, XXI and XXII. As compared with the thorax the most 
striking difference is the weak development of the oblique lateral 
muscles, and the absence of muscles that cross the median 
line; both conditions correlated with the simpler movements 
of this part of the body. Here also there are no such confusing 
cases as a of the thorax, where several morphologically widely 
separated muscles form a single functional unit. There is no 
