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Sub-order V. ACRIDIODEA. 



(Short-horned Grasshoppers.) 



Included in the Acridiodea are immense numbers of 

 grasshoppers, which may be denned as : Orthoptera 

 with hind legs longer than fore or mid legs and having 

 their femora wider towards tlie base ; the " ear' on the 

 first seament of the abdomen, at the side, towards the 

 top, the "music' being produced btj hind leg anJ 

 eh/tron ; ante-mite short; tarsi ivith three segments; 

 ovipositor not conspicuous, composed of four short valves. 



Females may be distinguished by the form of the 

 external genital organs, there being an ovipositor of 

 four valves, which project beyond the supra-anal plate 

 and sub-genital lamina. In the male the sub-genital 

 lamina is recurved and somewhat pointed, forming the 

 apex of the abdomen. 



We may divide the Acridiodea into nine families : 



W.B.* 1. TETRIGID.E. W. 6. 



2. PNEUMORID.E. W. 7. PYRGOMORPHIDJS. 



3. MASTACIDJE. W. 8. PAMPHAGIDJS. 



4. PROSCOPIID^;. W. 9. ACRIDIIDJE. 

 W.B. 5. TRUXALID^E. 



Two only of these contain British representatives, 

 the Truxalida? and the Tetrigidse- -nine species being 

 found in the former family, and two, belonging to the 

 genus Tetrix, in the latter. The typical family, 

 Acridiidge, containing the migratory locusts, includes 

 no species native to Britain. Though we possess so 

 few species, and most of those that we do possess are 

 small, yet they give a fairly good idea of the Acridiodea 

 as a whole. 



In some cases the eggs are elongated cylinders with 

 rounded ends slightly curved in the long axis, but 

 how far this is general in the group I cannot say. The 



* W. means represented in Western Europe ; B. means represented in 

 Britain. 



