PARKER: \F:W ENGLAND SARCOPHAGIDAE. 9 
Behind tlu- pleural suluii- aiul l)el()\v ih*- liasc of tlir wiii^ structure 
and its associated sclerites, the suhahir phitcs (PI. 3, fi^. IS, sup.), 
are the epimeron, the parts of the pcstseutelluni, and the sclerites of 
the metathorax. The epimeron, which is iiinnediatcly heliind the 
suture, is divided into two parts: an upper, the pteropleurite (PI. 3, 
fig. 18, pplc); and a lower, the meropleurite (PI. 3, fig. 18, mplc), 
the hatter formed by the fusion of the meron with a part of the plcuron. 
Posterior to the pteropleurite and extenchng diagonally upward and 
backward from it, is the postscutellum (PI. 3, fig. 18). Laterally two 
sclerites are marked off in the latter (fused in some insects) and 
constittite the pleurotergite (PI. 3, fig. 18, pt.). That part of the post- 
scutellum which lies beneath the scutellum and is visible between it 
and the dorsal surface of the abdomen is the mediotergite fPI. 3, 
fig. 18, mt.). 
All that region of the thorax which is posterior to and l)elow the 
plates just descril)ed constitutes the metathorax. I'nder the post- 
scutellum and laterally forming a sort of folded hinge, which articu- 
lates with correlated processes on the abdomen, is the metanotum 
(PI. 3, fig. 18, mtn.). Its lateral part extends downward between 
the pleurotergite and the upward projection of the meta-epimeron. 
Basally, as it approaches the region occupied by the spiracle it 
becomes membranous. From the membranous part arises the halter 
(PI. 3, fig. 18, hr.). Below the metanotum lies the meta-epimeron 
(PI. 3, fig. 18, mtem.). It is a very irregularly shaped sclerite divided 
into four distinct parts, the anteriormost of which forms the lower 
sides of the somewhat triangularly shaped area occupied by the 
posterior spiracle (PI. 3, fig. 18, psp.). The upper part of this triangle 
is formed by a sort of shelf-like projection of the pleurotergite. This 
projection is continued around on to the posterior side of the pleuro- 
tergite where a deep depression marks it off from the metanotum. 
The spiracle itself is a circular opening in the membrane of the tri- 
angular area just described. The anterior part of the angle formed 
by the lower portion of the pleurotergite and the meropleurite bears 
upon the chitinous parts bordering the spiracular area a sort of curved 
fringe of reflecting hairs. The free margin of the fringe is concave. 
The spiracle is closed by a rounded fan -like cover consisting, of hairs 
which radiate out from a point of attachment close to the lower pos- 
terior part of the spiracular opening. The distal edge of this cover 
fits rather imperfectly into the concave margin of the mat, thus closing 
