312 N. E. McINDOO 



This group is always present on the outer side of the first leg; 

 it may or may not be double, and its pores vary from 18 to 20. 



Group 7 of the third leg is always present, and its pores vary 

 in number from 14 to 16. On the second leg this group may be 

 definite or scattered, but usually has about 15 pores. This 

 group on the first leg is always definite, with about 15 pores. 



The pores of groups 8 and 9 are always considerably scattered 

 and usually these two groups can not be separated. They are 

 therefore not counted separately. Group 9 occurs only on the 

 third leg and is sometimes not found even on that leg. On the 

 third leg the number of pores of both groups varies from 7 to 

 .21. On the second leg group 8 varies from 6 to 35 and on the 

 first leg from 6 to 16 pores. 



Groups 10 and 11 may exist as two separate and scattered 

 groups or as one scattered group. On the third leg the pores_ 

 of these two groups combined vary in number from 13 to 26, 

 with about 16 as an average; on the second leg from 6 to 20, with 

 14 as an average; on the first leg from 4 to 20, with about 12 as 

 an average. 



Groups 12 to 15 are usually present on all three legs. Groups 

 12 and 13 are relatively constant in position and number of 

 pores, while groups 14 and 15 are much scattered and vary con- 

 siderably in number of pores. Group 12 usually consists of 15 

 or 16 pores, while No. 13 consists of a few less, although its 

 pores often can not be separated from those of No. 14. The 

 combined pores for all four groups on the third leg vary in num- 

 ber from 24 to 48; for the second leg, from 13 to 44, with none on 

 the inner side of one leg, but with more pores than usual on the 

 other side of this leg; for the first leg, 32 to 47. 



Groups 16 and 17 are very similar to groups 10 and 11 except 

 that they do not have so many pores and that on half the legs 

 one of them is either absent or united with the other group. Their 

 combined pores vary from 3 to 15, with about 10 as an average. 



Group 18 is discernible in every case where the ventral sides 

 of the tarsal joints directly face either cover glass, although 

 only about a third of the tarsi happen to be turned in such a 

 position. Usually two large pores are present on the third tar- 



