484- EXTERNAL ANATOMY OF INSECTS, 



similar situation a . In many Coleopterous insects, besides 

 Sagra, you will discover traces of the part we are consi- 

 dering : as in Anthia, Dytiscus, and several others of the 

 Predaceous beetles. In Cistela it is larger than the nose 

 itself; but it is more conspicuous in the Orthoptera, par- 

 ticularly in Locusta {Gryllus F.), in which it is the space 

 below the antennas, distinguished by two or four rather 

 diverging ridges b . In the Libellulina, Myrmeleonina, 

 &c. it is a distinct transverse piece. In Dasyga Latr., 

 a kind of bee, it is armed with a transverse ridge or horn 

 — But enough has been said to render you acquainted 

 with it ; I shall therefore proceed to the next piece. 



hi. Frons c . — The Front of insects may be denomi- 

 nated the middle part of the face between the eyes, 

 bounded anteriorly by the nose, or after-nose, where it 

 exists, and the cheeks ; laterally by the eyes ; and poste- 

 riorly by the vertex. Speaking properly, it is the region 

 of the antenna ; though when these organs are placed 

 before the eyes, under the margin of the nose, as in many 

 Lamellicorn and Heteromerous beetles, they seem to be 

 rather nasal than frontal. This part is often elevated, 

 as in the elastic beetles (Elater), whose faculty of jump- 

 ing, by means of a pectoral spring, has been related to 

 you d . In Anthia, a Predaceous beetle, it has often three 

 longitudinal ridges. In many of the Capricorn beetles 

 {Cerambyx L.), it is nearly in the shape of a Calvary 

 cross, with the arms forming an obtuse angle, and then 

 terminating at the sinus of the eyes in an elevation for 

 the site of the antennae. In the ants also (Formicidce), 



a Kirby Mon. Ap. Angl. i. t. i. Melitta. *. b.f. 3. 



b Plate VI. Fig. 4. b. <= Plates VI. VII, c. 



J Vol. II. y.. 317—, 



