ORTHOPTERA. IOI 



CC. Head rounded at the union of the vertex and front ; front perpendic- 

 ular, or nearly so. (Fig. 93.) 



D. The terminal spine of the outer row of the posterior tibiae wanting 

 (Fig. 94,^) ; second abdominal segment smooth. II. CEuiPODiNJE. 

 DD. The terminal spine of the outer row of the posterior tibiae present 

 (Fig. 94, a) ; second abdominal segment granulated on the 

 (Fig. 95.) III. EKF.MOI 



BB. Prosternum tuberculate, or mucronate, or produced into a cone. 

 C. Head rounded at the union of the vertex and front; front slightly re- 

 ceding; antennae filiform. (Fig. 99.) IV. ACRIDIN^. 

 CC. Vertex extending horizontally in front of the eyes ; front strong 

 ceding ; antennae more or less flattened. (Fig. 102.) V. OPO.MAI 

 AA. No pulvilli between the claws of the tarsi ; pronotum extending over the 

 abdomen. (Fig. 103.) VI. 



Sub-family I. TRYXALIN/E.* 



In the linear arrangement of the sub-families of the Acrididae 

 there are placed first, i.e., lowest, a series of sub-families in which the 

 ternum is unarmed. The Tryxalinae differs from the other 

 members of this series in that the representatives of it have the 

 lex conical and elongated, the front strongly receding, and the an- 

 tennae flattened. The antennas are inserted between the middle of 

 the eyes or farther from the mouth than their middle; the eye> 

 usually longer than that part of the genae below them ; the posterior 

 lobe of the pronotum is usually shorter than the anterior part ; the 

 median carina is not at all crested; and the last spine of the outer 

 row of the posterior tibia; is wanting. 



The ch tic difference between this family and the I 



the CEdipodinae, is in the joining of the vertex and front, as in<! 

 ed in the table of sub-families given above. The following species 

 rve to illustrate the Tryxal 



**/.-! ne <>f the most grotesque of all mir 



locusts. The body is excessively elongated, being almost line .u. In 

 fully grown i more than 40 mm. (1.6 in.) 



in length ; and about 3 mm. ) across in the widest part. The 



mal '.rnewha: i. The head is greatly elongated, 



ascending; the front is very strongly n the an: 



little shorter than the head and prothorax, broad near ti. 

 acun it the apex, and triquetrous The wing :all: 



when fully developed the tegmi; ;ul a little beyond the third 



* Tryxallnar, Tryxlii*: tryxallit (rpv^i\\if), Greek name of these insects. 



