116 Annals Entomological Society of America [Vol. VII, 
LYONET LUBBOCK = BERLESE 
TRANSVERSE SUBTRACHEAL, Above subventral fold. 
From near incisure to precosta a 37, 38 XVIII 
Mesotergite to mesosternite 6, € HU a2 XVIIIa 
Crossing the pleurosternal line. 
Spiracle to precosta if 39 5b 
Propleurite to precosta m(sometimes) 42 5b 
q (rarely) AO, 41 
Mesotergite to parts of leg Boy 46-50 5a, 58 
Short posterior muscles (ens 33-34 XVIII 
Below the pleurosternal line. 
Behind precosta q, m 40,41(42) 5ba 
Across leg in front n 43 6a 
Across leg behind (from w) Tr 53-54 68 
From fold or yw to leg (part) baa 
From fold or y to anterior edge: of 
following segment ¢(part) 31-32 
Zz 55 XVIIIB? 
Notes: (1) la8 in most forms, not distinct from V in Cossus, I on legless segments 
(2) The fibre of 6 which runs between the precostae is marked 4 on the 
plates; it is not well defined in Cossus or Sphecodina. Fibres of 
6 proper spread fan-like from the acrosternite to various points in 
the acro- and protergites. 
(3) To antecosta of following segment in Pheéocyma. 
(4) From acrosternite in Pheocyma. 
The muscles which attach to the ends of the segments are 
sharply divided into two groups, in the first, comprised of 
A, B, C, E, a, b, c, d, the muscles of successive segments are 
united, forming a single polygastric muscle, the remainder 
are so inserted to leave a distinct space between muscles of 
successive segments. In the case of D and i, the distinction 
is striking, as compared with A and a respectively. 
NERVES. 
There are three pair of nerves from each abdominal ganglion. 
The principal or anterior one runs almost directly out from the 
anterior half of the ganglion, passing over all the muscles near 
the midventral line, but soon plunging in (between a and c) and 
running between the layers up to the subdorsal region, where it 
ends in a longitudinal fibre, perhaps the chordotonal organ. 
It supplies but little of the skin, but sends off numerous branches 
to the muscles, especially the larger segmental ones. The 
second or posterior pair of nerves runs obliquely downward 
under i, passes between k and p, often forming the only dis- 
tinction between these two muscles, and then ramifies in the 
crowd of short muscles connected with the proleg, and on the 
skin. The third runs directly back as a single nerve from the 
posterior end of the ganglion under the fused connectives, 
