414 N. E. McINDOO 



reduced, and the hind wings are only rudimentary. The wings 

 of the mole-cricket (no. 43) are very small, about one-half the 

 length of the abdomen. The hind wings of the common cricket 

 (nos. 44 and 45) are very small and the pores on them are 

 minute. Only occasionally were a few pores observed on the 

 thoracic segments. 



c. Pores on abdomen. Relative to the pores on the abdomens 

 of adult specimens, the number varies as follows: abdominal 

 segments (nos. 8 to 13, 35 to 47) to 178 (no. 1) ; cerci (nos. 8 

 to 18, 24, 29, 32, 34, 35, 36, 38 to 42, 44 to 47) to 130 (no. 43); 

 and ovipositor (nos. 36, 42, 45 and 47) to 116 (no. 24). The 

 male of Blatta orientalis (no. 4) and of Periplaneta americana 

 (no. 6) has a pair of anal stylets which bear 42 pores, most of 

 which lie on the dorsal surface. The cerci of these two species 

 bear 51 pores, nearly all of which lie on the ventral surface at 

 the extreme distal ends of the segments; however, in the grass- 

 hoppers and crickets the pores are widely scattered over the sur- 

 face of the cerci. The pores on the cerci and anal stylets of nos. 

 4 and 6 have been added and then recorded under cerci. 



The total number of pores found on the entire integument 

 varies from 271 (no. 11) to 1616 (no. 33); the mantids and phas- 

 mids have the smallest number, certain acridids the largest 

 number, while most of the remaining ones have a medium number. 



d. Pores on first and last instars of croton-bug. Comparing the 

 number of pores on the first instar (no. 3, recently hatched) 

 with the number on the adult male (no. 1), we have the following 

 figures: mandibles 31-68; maxillary palpi 5-14; galeae 15-74; 

 laciniae 7-69; hypopharynx 8-40; labial palpi 7-13; paraglossae 

 4-45; glossae 0-9; labrum 7-15; mentum 7-6; total number on 

 mouth-parts 91-353; head capsule 25-22; antennae 26-41; ab- 

 dominal segments 126-178; cerci 11-82; legs 192-354; no front 

 wings 47; no hind wings-11; and total number of pores found 

 on entire integument 471-1088. Hence, the first instar has less 

 than one-half the number of pores possessed by the adult; this 

 was also found true for the grasshoppers. 



e. Family, generic, specific, and sexual variations. Relative to 

 these pores, the family variations may be small or large, depend- 



