394 PROCEEDINGS OF THE ACADEMY OF [May, 



The following are those variations which could not be placed in 

 the table. (1) Organ No. 1 on the coxa of the legs in Moggridgea 

 and a few others have six or seven slits (fig. 35). (2) On the tro- 

 chanter of the palps in one-half the cases where two or three organs 

 are present at least one is always and sometimes two are diffused. 

 (3) Concerning the same joint of the first leg, there are 18 species with 

 one diffused organ, 10 species with two diffused organs; for the second 

 leg 23 species each with one diffused organ, 7 species each with two 

 such organs; for the third leg one diffused structure in each of 17 

 species and 5 species each with two such organs; for the fourth leg- 

 in each of 14 species one such organ, while each of 9 species has two 

 diffused organs. On the legs a diffused organ never occurs unless 

 at least two organs are present, and two diffused organs are never 

 seen unless at least three in all are observed. (4) In all species with 

 a low total number of organs, No. 5 and 6 on the femur never have 

 many more than three slits. (5) The paired organs No. 7 and 8 are 

 always present, while in six species No. 9 is absent on the first and 

 third legs; it is missing, however, in only three species on the second and 

 fourth legs. In Hermacha this organ on each leg is slightly diffused. 

 No. 7 and 8 in Caponia and Palpimanus are out of their ordinal}' 

 position. (6) On the fifth joint of the palp of the first five named 

 species, there is a transverse organ (fig. 40) in the same position as 

 No. 13 on the metatarsus of the legs. In the first four species three 

 or four longitudinal organs occur besides this transverse organ. All 

 of these organs are proportionately large as represented by those of 

 Moggridgea (figs. 25, 40, 48, 56). The largest of these (fig. 56) has 

 thirty slits, the greatest number found in any organ of any species. 

 Fig. 12 shows the large organ on the dorsal side of the tibia of 

 Uroctea. The other three on this joint are very small. (7) On the 

 sixth joint of the palps the large transverse slits called c and d were 

 observed in only a few of the species. (8) On the legs the majority 

 of the species have at least one of the two large slits called a and l>. 

 In several cases one of these slits becomes a simple organ and in a 

 few cases as in Evagi-us or Atypus one has changed into a compound 

 organ, while the other one remains a simple organ. Hence, on the 

 sixth joint in the first leg of Atypus and on the fourth leg of Evagru$ 

 there are two compound and one simple organ. As usual one of the 

 former is transverse and the other two are longitudinal. (9) Among 

 the 39 species only Hypochilus has organs on the tarsi. These are 

 small transverse organs located at the extreme distal end always on 

 the anterior side (fig. 49). In almost every species there is at least 



