1916] Cranipton — Maxillw of the Acridiidre 85 



which correspond in a general way to the two subdivisions of the 

 cardo. The juxtastipes of PhylHum (Fig. 2, js) is much broader 

 than in the other insects here figured, and the verastipes {vs) is 

 divided into an upper and lower region in this insect. • The lower 

 region (p/) corresponds in a general way to the palpifer of the 

 other insects, but is not strictly homologous with the palpifer. 



A comparison of the maxillse of certain immature Plecoptera, 

 Ephemerida, and of certain Thysanura, with the first and second 

 maxillae of such centipedes as Scutigera and Scolopendra, would 

 indicate that the maxillae of an insect is compound, and probably 

 represents a combination of the first and second maxilhie of Scuti- 

 gera, etc. I am not yet prepared to say, however, that the line of 

 demarcation between the juxtacardo and veracardo, which is con- 

 tinued upward between the juxtastipes and verastipes, represents 

 the line of union of the basal portions of the two components of an 

 insect's maxilla — although the possibility of such a condition would 

 bear further investigation. 



The palpifer (pf) or palpus-bearing sclerite, is rather indistinctly 

 demarked in the insects under consideration. It is practically 

 always bent backward, or folded around to the other side in such 

 a fashion that the palpus (pp) is borne on the surface of the maxilla 

 opposite to the one shown in the drawings. 



The palpus (pp) is composed of five segments, and, in the insects 

 under discussion, the two basal segments are subequal in size, but 

 are much shorter than the three terminal ones. The three terminal 

 segments of the palpus may be subequal in size, or the intermediate 

 one may be shorter than the other two. 



The segments of the maxillary palpus of Phyllium (Fig. 2, pp) 

 are much flattened, or depressed, in conformity with the general 

 flattened condition of the entire body of this insect. The two 

 distalmost segments of the palpus of the Tettiginse (Fig. 4, pp) 

 are also considerably flattened, but this is apparent only after 

 turning the palpus around to a much greater angle than that at 

 which the remainder of the figure was drawn. The end segment 

 of the palpus of Dissosieira (Fig. 3) bears a well marked terminal 

 sensory area demarked by a dotted line in the drawing. This area 

 is well provided with sensory setae whose chief function is doubtless 

 gustatory. 



