39 



away, while others appear so gradually that it is difficult to tix the boundaries 

 of the groups. The connection between the Proscopini and Tryxalini is 

 sufficiently marked to bring them into conjunction in a continuous series; 

 but passing downward from the latter, the question arises, shall we be guided 

 by the sub-conic front, oblique face, and slender body, or shall we select, as 

 * ruling characters, the acuminate antennae and prosternal spine? In the former 

 case the QCdipodini must necessarily follow Tryxalini, and then we would 

 scarcely be justified in thrusting a group between the ffidipodini and Acri- 

 dini ; yet Xipliocerini appears misplaced if located below either of these 

 groups. Another difficulty, in arranging a single series, is experienced in 

 forming the connection with the Locustidse — not that we fail to find genera 

 in the t^YO which are sufficiently assimilated for this purpose — but, to do this 

 the Tettigi must be tlu'own back into the middle of the family, as Walker 

 indicates Brunner de Wattenwyl has done. Yet, any one who has studied 

 this order must have noticed the strong resemblance between the Tettigi and 

 Tridactyli ; and the anatomical researches of L(^on Dufour show this external 

 similarity to be more than fancied, for he remarks, "The genus Tetrix (Tettix), 

 founded by Latreille, appears to have been created by nature to serve as the 

 connecting link between the Tridactyli and Acridii." It is evident, then, if 

 we are guided by these prominent characters, we must place the Tettigi as 

 near as possible to the Grryllidge, and that Tettiginae as a sub-family must 

 stand below (according to the descending series I have adopted) Acridinse as 

 a sub-family. ' . ♦ 



i have not had an opportunity of studying either the Trigouopterygi or 

 Xiphocerides, and therefore hesitate to suggest an arrangement including 

 these groups ; nevertheless, I propose the following as perhaps approximating 

 a natural aj.-rangement of the various groups of Acridinas : 



I._Sub-fam. ACRIDIN^. 



Divis. 1. CONOCEPHALIDES. ■ 



Group 1. — Proscopini. 

 Group 2. — Tryxalini. 

 Groiq) 3. — Trigonoiiterygini. 



Divis. 2. — Okthocerides. Divis. 3. — Xiphocerides. 



Group 4. — CEdipodini. Group 6. — Xipliocerini 



Group 5. — Acridini. Group 1{\). — Fhymatini[\). 



