ODONATA. 
329 
(uropleurites) are only seen from beneath, but are well developed. The 
abdomen of Termes flavines is substantially as in Termopsis. 
Fig. 13.— Abdomen of Termes flavipes. Lotteriug as in fig. 12. Enlarged. 
Suborder 2. Odonata. Plates XLYII-L. 
THE HEAD. 
Agrion verticale Say. (PI. XLYII, figs. 4-6.) The structure of the 
head of Agrion and Calopteryx is more easily understood than that of 
iEsehna and Libellula, as their eyes are much smaller, and the develop- 
ment of the epicranium is more equable and normal. The head is unusu- 
ally short and wide; the orbits very wide; eyes spherical. The epicra- 
nium, exclusive of the orbits, is about as long as broad, with a decided 
ocellar area, the ocelli being large and closely contiguous. In front of 
the ocelli is a deep impressed line parallel to the clypeus. 
The clypeus is moderately large, about one-halt as long as broad, 
with a high, sharp, shelf-like side; it is divided into a clypeus posterior 
and anterior; the post-clypeus being horizontal like a shelf, and the 
auteclypeus forming a vertical wall. 
The labruin is large and broad, well rounded in front. The gome are 
very large and broad, smooth, and continuous with the orbits. The 
gula is membranous. 
In Calopteryx w xaculata the head is much as in Agrion, but the clypeus 
is more clearly defined and separate from the epicranium than in Agrion. 
The epicranium is wider and larger than in Agrion ; a transverse im- 
pressed line separates it into a posterior and anterior area. 
In JEsclina lieros (PI. XLV11, figs. 1-3) there is no definite trace of the 
occiput, unless a postorbital ridge between the gula and orbits maiks 
its limits. This ridge becomes obsolete towards the median line near the 
