HYMENOFTERA . 
607 
tip of vein III, separates from the costa and coalesces with the tip of 
vein III, at some distance from the costa. The space thus formed 
between the united tips of veins IIIi and Ilia and the costa is termed 
the cippendiculate cell (Fig. 736, ap). 
Fig 736. Wings of Larra with the cells numbered: appendiculate cell. 
The cells marked m, m, m, in Figure 735, are termed the marginal 
cells ; and those marked sm, sm , sm, sm, the submargltialcells. 
The following table for determining the families of the Hymen- 
optera has been compiled from the works of several writers on this 
order, and is merely provisional. It, however, will enable the student 
to determine the larger and more common forms; and in the present 
state of our knowledge the study of the minute Hymenoptera is too 
difficult for the beginner. 
TABLE FOR DETERMINING THE FAMILIES OF THE 
HYMENOPTERA, 
A. Trochanters of the posterior legs, consisting each of two segments 
(Fig- 737 * b) ; caudal end of body in the female furnished with a 
saw or borer for depositing the eggs. (Suborder Terebrantia.) 
B. Abdomen joined broadly to the thorax. 
C. Anterior tibiae with two apical spurs ; abdomen of female fur¬ 
nished with a pair of saws. p. 611. Tenthredinidje. 
CC. Anterior tibiae with one apical spur; abdomen of female fur¬ 
nished with a borer, p. 614 
.Siricidje. 
BB. Base of abdomen constricted. 
C. Abdomen joined to the dorsal aspect of the metathorax, p. 626. 
EVANIIDiE. 
CC. Insertion of the abdomen normal. 
D. Fore wings with no closed cells.* 
* In a few Proctotrupidae the wings have one or more closed cells. 
