408 



N. E. McINDOO 



The mandible bears two groups of pores (figs. 3 and 4, a and 

 b), one being on the outer side and the other on the inner side, 

 and also several isolated pores. The labrum bears one group of 

 4 pores (fig. 5, a) on the ventral side. At the base of the hypo- 

 pharynx there are two groups of pores, one of 32 (fig. 6, a) being 

 on the left side and one of 27 pores (7, b) on the right side, besides 



Figs. 3 to 9 Disposition of olfactory pores on mouth-parts of same grass- 

 hopper as mentioned in figures 1 and 2. Fig. 3, outer surface, and fig. 4, inner 

 surface of same mandible; fig. 5, dorsal surface of labrum; fig. 6, outline of left 

 side, and fig. 7, outline of right side of hypopharynx; fig. 8, ventral surface of one- 

 half of maxilla and labium, and fig. 9, dorsal surface of same half of maxilla and 

 labium. Figs. 3, 4, 5, 8, and 9, X13; figs. 6 and 7, X21. 



many isolated pores on either side about midway between the 

 base and top of the appendage. Every portion of the maxilla 

 and labium bears pores, 176 being found on the ventral side and 

 84 on the dorsal side; most of them are scattered, but four groups 

 are present, two of these being on the ventral side of the lacinia 

 (fig. 8, c and d), one on the dorsal side of the lacinia (fig. 9, i), and 

 one on the dorsal surface of the third segment of the maxillary 

 palpus (fig. 9, h). The scattered pores are represented in the 



