326 REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 
Metapleurum.' (Fig. 12.) Episternum much as in mesotliorax, but the 
epimerum is narrow, triangular, and reduced to a point next to the 
trochantine. Coxa and trochantine well developed, rather long and 
large ; the coxa considerably narrower than the trochantine. 
Sternum. , 
Prosternum. Very small, rudimentary. 
Mesosternum very small, triangular ; the coxae nearly meeting on the 
median line of the body. 
Metasternum small. 
Termitidhs. Plates XXXIX, figs. 1-5; XL, figs. 3,4, 8; XLI, XLII, 
XLIII, figs. 1-9. 
THE HEAD. 
Termopsis angusticollis. (PI. XXXIX, figs. 1-3.) The head is broad 
and flat, oblong-oval in shape. The epicranial region is remarkably 
simple, not subdivided, with no V-shaped suture, and the eyes are very 
small. The clypeus is very simple, very short and broad ; and only an 
impressed line, no suture, separates it from the epicranium. The labrum 
is large, one-half as long as broad, and much longer than the clypeus. The 
genre are separated from the upper portion of the epicranium by a sharp, 
lateral, conspicuous ridge. The gular region is small, membranous. 
The labium is not differentiated into a submentum and menturn. 
In Termes flavipes (figs. 4, 5) the head is oblong, with faint traces of a 
V-shaped suture; the clypeus is subdivided into an anterior and pos- 
terior portion, the two subequal and well marked. 
THE THORAX. 
Notum. 
Pronotum ( Termopsis ). (PI. XLIII, fig. 1.) Somewhat crescent- shaped, 
being excavated in front and rounded behind. 
Hesonotum. (Fig. 2.) Remarkably square, as long as broad, with the 
elements but partly differentiated, an approach to that of Pteronarcys, 
the slight partial anterior attachment of the wings being correlated 
with the undeveloped nature of the tergal sclerites. The praescutum 
is not visible. * 
The scutellum Is not differentiated from the scutum; the latter 
forming a somewhat swollen flattened boss on each side, but in the 
middle of the notum contracted, becoming narrow, the region where 
the scutellum usually is being about a quarter less wide than the scutal 
region. Postscutellum wanting. 
Mctanotum. (Fig. 3.) Considerably smaller than the mesonotum, 
hour-glass shaped, being much contracted in the middle, forming an 
