EXTERNAL ANATOMY OF INSECTS. 483 
Fabricius Prosopis, remarkable for its scent of baum, 
you will find a similar triangle marked out in a similar 
situation*. In many Coleopterous insects, besides Sa- 
gra, you will discover traces of the part we are consider- 
ing: asin 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 Zocusta, in which it is the space below the 
antennze, distinguished by two or four rather diverging 
ridges’. In the Libellulina, Myrmeleonina, &c. it is a 
distinct transverse piece. In Lithurga? 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. 
ill. Frons*.—The Front of insects may be denomi- 
nated the mzddle 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 pos- 
teriorly by the vertex. Speaking properly, it is the re- 
gion of the antenne ; 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 (Zlater), whose faculty 
of jumping, by means of a pectoral spring, has been re- 
lated to you". In Anthia, a Predaceous beetle, it has 
often three longitudinal ridges. In many of the Capri- 
corn beetles (Longicornia), it is nearly in the shape of a 
Calvary cross, with the arms forming an obtuse angle, 
® Kirby Mon. Ap. Angl. i. t.i. Melita *. b. f. 3. 
» Prate VI. Fic. 4. b. ¢ Prares VI. VII. e. 
* Vor. If. p. 313—. 
