488 EXTERNAL ANATOMY OF INSECTS. 
in many bugs, by a similar elevation of the cheeks, the 
bed of the promuscis is formed. In the Homopterous 
Hemiptera they run parallel nearly with the rhinarium 
or nostril-piece. In the Hymenoptera they are almost 
always ample, but they are confined to the lower side of 
the eye. In Screx Gigas, and others of that genus, the 
cheek at the base of the mandible is dilated so as to form 
a rounded tooth below it. In the Capricorn beetles it 
is considerable, and sometimes terminates, at the base 
of the mandible, in two or three notches. In Scaurus 
and Eurychora, darkling-beetles, the cheek below pro- 
jects into a lobe that covers the base of the mazilla. 
But the animal distinguished by the most remarkable 
cheeks is a species of Phryganea L. (Prosoponia Spencié 
Steph.) ; for from this part projects a spoon-shaped pro- 
cess, which curves upwards, and uniting with that of the 
other cheek, forms an ample mask before the face, the 
anterior and upper margin of which, in the insect’s 
natural state, are closely united; and the posterior part 
being applied to the anterior part of the eye, causes the 
face to appear much swoln. It looks as if it was a 
single piece ; but upon pressing the thorax it opens, both 
above and in front, into two parts, each convex without 
and hollow within, and each having attached to its in- 
side a yellow tuft of hair resembling a feather. ‘The use 
of this machinery at present remains a mystery *. 
vil. Zempora*.—The temples (Tempora) are merely 
a continuation of the cheeks to the posterior limit of the 
4 This insect was taken both at Matlock and Exmouth. The body 
and thighs are of a light-brown, wings testaceous, legs pale ; antennze 
between setaceous and filiform, two-thirds the length of the body ; 
first joint not much thicker than the rest. 
byPraves VI. Vilng 
