1919] Mclndoo: Olfactory Sense lb 



larvae were the least favorable of all, owing to their almost 

 total lack of pigment and to the fact that the . hairs on the 

 epicranium arise from large tubercles. 



The following table gives the larger variations concerning 

 the disposition of these pores and now the smaller variations 

 may be briefly stated. For sake of brevity, instead of using 

 the long scientific names of the larv« examined, the species will 

 be numbered from 1 to 30, and those interested in associating 

 the names of the species with the variations described may do 

 so by referring to the names and numbers of the species in the 

 table on page 76. For each of the 30 species examined, the 

 pores are constant in number on the following parts of the 

 integument: Front, 2; each antenna, 1; each stipes, 1; each 

 maxillary lobe, 1 ; each second segment of the maxillary palpus, 

 1 ; and each third or terminal segment of the maxillary palpus, 4. 

 The number of pores found on the epicranium (including the 

 adfrontal piece) varies as follows: On each of 14 species, 

 10 pores (Nos. 1, 3, 6, 10, 12, 14, 16-18, 21, 24, 25, 29, 30); 

 on each of 4 species, 12 pores (Nos. 2, 4, 5, 22); on each of 9 

 species, 14 pores (Nos. 9, 11, 13, 15, 19, 20, 23, 27, 28); on 

 each of 2 species, 18 pores (Nos. 7, 26) ; and on 1 species, 24 

 pores (No. 8, the army worm). 



If all of the pores on each epicranium had been found, per- 

 haps 20 would be a common number for nearly all of the 

 species. One pore was found on each mandible of 29 species, 

 but had this appendage been examined more carefully two 

 pores might have been found on each mandible as already shown 

 for the army worm. The number of pores found on the labium 

 varies as follows: On each of 12 species, 4 pores (Nos. 1, 12, 13, 

 15-21, 23, 26) ; and on each of 18 species, 6 pores (Nos. 2-11, 14, 

 22, 24, 25, 27-30). The number of pores found on the labrum 

 varies as follows: On each of 5 species, 2 pores (Nos. 7-10, 16); 

 on each of 11 species, 4 pores (Nos. 6, 11, 14, 17-19, 21, 23, 

 25-27) ; and on each of 14 species, 6 pores (Nos. 1-5, 12, 13, 15, 

 20, 22, 24, 28-30). The first segment of each maxillary palpus 

 has 1 pore, except 2 were found on each one of 4 species (Nos. 

 3-5, 8). Three pores were found on each femur, except 2 on 

 each one of 10 species (Nos. 14, 15, 17-19, 21, 22, 24, 25, 29). 

 One pore was found on each tibia, except 2 pores on each of 

 1 tibia of 2 species (Nos. 9, 14) and 3 pores on 1 tibia of 1 

 species (No. 30). One pore was found on each tarsus, except 



