1916] Crampion — Maxillce of the Acridiidae 87 



The basal two of the five segments of the palpus are subequal, 

 and are much shorter than the three distal ones, which are usually 

 subequal in length. 



All of the segments of the palpus are greatly flattened in the 

 Phylliidse, while in the Tettiginse, the distal two are somewhat 

 flattened. 



The galea is composed of two segments, and the distal one over- 

 tops the lacinia, save in the Tettiginre. 



The distal segment of the galea of the Phasmidse bears a well 

 developed lobular process (galealobulus) which may represent the 

 basal lobe of the bilobed galea of certain Hymenoptera. It is but 

 feebly developed in the Phylliidae, and is absent in the Acridiidse. 



The tooth-like processes of the lacinia (laciniadentes) occur in 

 two rows, thus differing from those of many other Orthopteroid 

 insects in which they occur in a single row. 



The maxilla of the Phylliidte resembles that of the Phasmidse 

 rather more than it resembles that of the Acridiidse. 



The maxilla of an insect is possibly compound, and may represent 

 the combined first and second maxillae of Scutigera, and other 

 centipedes. 



Explanation of Plate XI. 



Fig. 1. Posterior view of the left maxilla of a Phasmid. 



Fig. 2. Posterior view of the left maxilla of Phyllium. 



Fig. 3. Posterior view of the left maxilla of Dissosteira. 



Fig. 4. Posterior view of the left maxilla of a Tettigid. 



Abbreviations. 



ac = articulatory condyle of cardo. 



bg = basal segment of galea (basigalea). 



CO = cardo. 



dg = distal segment of galea (distigalea) . 



gl = lobular process of galea (galealobulus) . 



jc = proximal subdivision of cardo (juxtacardo). 



js = lesser subdivision of stipes (juxtastipes). 



la = lacinia. 



pf = palpifer. 



pp = maxillary palpus. 



st = stipes. 



vc = distal subdivision of cardo (veracardo) . 



vs = principal subdivision of stipes (verastipes) . 



