ORTHOl'TEUA. — LOCUSTIDiE. 



Fig. 56. 



i-5l 



exhibits on the underside two impressions {Jiff. 56. 13.), so that it may 

 be easily perceived that it is composed of three joints soldered toge- 

 ther, and the wing-covers are not furnished with the ocellated spot 

 observable in the preceding family, stridulation being produced in a 

 different manner in these insects. 



The body of these insects is more robust than in the preceding 

 family, and compressed at the sides, especially in the abdominal part, 

 which causes the whigs to assume a deflexed position in repose. The 

 three ocelli are ordinarily distinct, the central one being never obli- 

 terated, as in the Gryllidas {Jiff. 56. 2. head of L. migratoria in front ; 

 Jiff. 56.3 — 13, details of ditto); the upper lip {Jiff. 56. 3. underside), 

 is notched at the anterior margin, the mandibles are strong and 

 very much toothed (Jiff. 56. 4. 5.) ; the palpi are short and cjlindrical 

 (Jig. 56. 6. maxilla) ; the labium is large, but consists of only two 

 lobes {Jiff. 56. 7.). 



The females are destitute of an elongated exserted ovipositor, the 

 terminal segments of the body (Jiff. 56. li.) being furnished \\\\\\ four 

 short conical horny appendages, wliich represent the parts of the 

 ovipositor of the Gryllidae. In the males (^Jiff. 56. lo.), the two 

 lower appendages are represented by a horny plate. The inferior 

 surface of the abdomen in the males consists of eight, but only of 

 seven segments in the females : the extremity of the body is also 

 furnished with two very short conical filaments. 



The stridulating powers of these insects must have attracted tlie 

 notice of every one who has walked through the fields in the autumn ; 

 unlike the insects of the two preceding families, it is owing to the 

 motion of the hind femora, either conjointly or alternately rubbed 

 against the sides of the wing-covers, that the sound is produced, the 



