J MODERN CLASSIFICATION OF INSECTS. 
some of the individuals, whilst he regarded the winged ones as be- 
longing to the neuropterous genus Hemerobius. 
M. Brullé proposes to form these insects into a distinct order in 
his work on the insects of the Morea, named Isoptera ; whilst 
Mr. Kirby regards them as forming, together with the ants, to 
which they are allied in so many points in their economy, a passage 
between the orders Neuroptera and Hymenoptera. 
These insects live in communities of countless numbers, of which 
the majority are apterous. The males and females are, however, 
winged, and are distinguished from the other Neuroptera by the 
following characters. The body is oblong, depressed, and of nearly 
equal breadth throughout (jig. 58.1. represents a large Brazilian 
Fig. 58. 

species); the head is of moderate size, horizontal, and rounded behind 
(fig. 58.2. front of head) ; the eyes lateral, prominent, and subglobose ; 
the ocelli, two in number, more or less distinct, placed between the 
eyes, the third ocellus being subobsolete; the antennz short, with 
about twenty submoniliform joints, the basal joint being the largest 
(fig. 58.9.) ; the clypeus and labrum are distinct (fig. 58.2.), the 
latter produced over the mandibles, and subtriangular in form, with the 
sides rounded. The mandibles (jig. 58. 3.) are horny, flattened, and 
triangular in form, with several teeth on the inner edge; the maxille 
(fig. 58. 4. under, 58.5. upper side of the maxilla) are flat, horny, 
and terminated by two strong hooked teeth, and defended by a very 
broad external lobe or galea (fig. 58. 4.5.x .); the maxillary palpi are ~ 
rather longer than the maxille, filiform, and 5-jointed ; the labium 
(fig. 58.6. beneath, 7. laterally) is very perfect in its formation, being 
of large size, and occupying the greater portion of the under surface 
of the head; the mentum is coriaceous, transverse, with the fore mar- 
