56 MODERN CLASSIFICATION OF INSECTS. 
Fig. 66. 


multi-articulate ; the labrum small and quadrate, arising from a distinct 
leathery clypeus ; the mandibles powerful, curved, and strongly toothed 
(fig. 66. 3.); the maxille are terminated by two lobes strongly pilose ; 
the palpi short, filiform, and 5-jointed, the basal joint being very mi- 
nute ; the labium small, with short palpi, of which the terminal joint 
is longest; the hind part of the head is constricted into a neck or 
rotula, playing in the anterior aperture of the singular cylindrical 
prothorax, which is long and narrow, the sides being deflexed, and 
meeting in the middle beneath, so that one folds partially over the 
other (fig. 66.4.); the meso- and meta-thorax are much _ broader, 
and of equal size; the legs are slender and simple ; the anterior pair 
are inserted at the under side of the prothorax, where its deflexed 
angles, being cut off, leave a triangular space in front of the meso- 
sternum ( fig. 66. 4.) ; the tarsi (fig. 66. 5.) are 5-jointed, the third 
joint being deeply bilobed, and the fourth joint small, and affixed 
between the lobes of the preceding. Percheron describes the ungues 
as composed of two pieces, of which the apical one is moveable ; 
but this is certainly incorrect. The abdomen is sessile, of moderate 
length, 9-jointed, and terminated in the females by a long sabre-like 
ovipositor (fig. 66. 6.) of a slender construction, composed of two 
plates (De Geer, Mém., tom. iii. pl. 15. f. 9.) very much compressed, 
transversely striated, longitudinally ribbed, and terminated by two 
minute oval appendages ( /ig.66.7.); the wings are moderately large, 
of nearly equal size, the posterior not folded when at rest, when 
they are deflexed at the sides of the body: they are strongly veined, 
the veins being inconstant, even in the same individual ; but their 
general arrangement is as in the Sialide, &c., with a distinct stigma, 
