86 Psyche [June 



The galea, or external lobe of the maxilla, is composed of two 

 segments — the hasigalea {hg) or proximal segment being much 

 shorter, and less distinctly demarked, than the distigalea (dg) or 

 distal one. The distigalea may overtop the inner maxillary lobe, 

 or lacinia (la), as is the case in three of the insects here figured 

 (Figs. 1, 2 and 3), and this condition is characteristic of most 

 of the insects related to the phasmids. The Tettiginje, however 

 (Fig. 4), seem to be an exception to the rule, and in this respect 

 resemble certain Gryllidae. 



The distal segment of the galea (distigalea) of the Phasmids 

 bears a well developed lobular process, the galealohulus (Fig. 1, gl) 

 which may be homologous with the basal lobe of the bilobed galea 

 of certain Hymenoptera. The lobule is poorly developed in Phyl- 

 lium (Fig. 2, gl) and is absent in the Acrididse here figured. 



The laciriia (la) or inner maxillary lobe is more nearly vertical 

 in outline in the Tettiginse, Phylliidae, and Phasmidse (Figs. 4, 2, 

 and 1), while in Dissosteira (Fig. 3) the inner margin of the lacinia 

 sweeps downward in a broad curve to the projecting inner basal 

 angle, thereby making the lacinia of this insect much broader at 

 the base than is the case with the other insects under discussion. 

 The inner basal angle of the lacinia of the Phylliidie and Phasmidae 

 (Figs. 2 and 1) is much more protuberant than in the maxilla of the 

 Tettiginae (Fig. 4), although in the latter insects also a projecting 

 basal portion is to be seen if the maxilla is turned much further 

 around than in the view shown in the drawing. In Dissosteira, 

 the surface of the inner basal angle of the lacinia is densely beset 

 with rounded microscopic scales. 



Along the inner margin of the distal portion of the lacinia, there 

 occur several tooth-like projections, or laciuiadentes. The function 

 of these "teeth" is apparently that of holding, and possibly of 

 assisting in comminuting the food. In the insects related to the 

 Phasmids, these laciuiadentes are arranged in two rows, or are 

 separated by a vertical groove into two sets, although there is 

 usually but one terminal "tooth." 



The principal conclusions here reached, concerning the maxillse 

 of the Acridiidpe, Phylliidae and Phasmidae, may be briefly sum- 

 marized as follows: 



The cardo is composed of two subdivisions, the juxtacardo and 

 veracardo. 



The stipes is composed of two principal subdivisions, the juxta- 

 stipes and verastipes. 



i 



