HYDROGEN ION CONCENTRATION IN BLOOD OF INSECTS. 365 



TABLE 2. 



SPECIES: Melano plus femur rubrum. 

 Age, Sex. pH of Blood. 



Nymph 7.00 



Nymph 6.23 



Nymph 6.95 



Nymph 6.36 



Nymph 6.70 



Nymph 6.59 



Nymph 6.71 



Nymph 7.07 



Nymph 6.79 



Nymph 6.96 



Nymph 6.55 



Nymph 6.70 



Nymph 6.45 



Nymph 6.66 



Adult cf 6.86 



Adult d" 6.86 



Adult d" 6.58 



Adult d" 1 6.80 



Adult 9 7.00 



Adult ? 6.73 



Average 6.70 



Range 6.23-7.11 



Explanation of Table 2. 



Data selected showing range of pH for blood of different individuals. All 

 animals laboratory raised and fed lettuce. Average and range of pH for all indi- 

 viduals tested. 



TABLE 3. 



SPECIES: Melanoplus differ enlialis. 

 Age. pH of Blood. 



Nymph 6.85 



Nymph 6.43 



Nymph 6.52 



Nymph 6.56 



Nymph 6.50 



Nymph 6.75 



Nymph 6.98 



Nymph 6.93 



Average 6.68 



Range 6.42-6.98 



Explanation of Table 3. 



Data selected from several hundred individuals showing range of pH values. 

 Adult values are similar to those for nymphs. Animals reared in laboratory and 

 fed lettuce. Average and range of pH for all individuals tested. 



