Dugesiella hentzi (Girard). 



365 



The scapulae, which are not divided longitiidinally by spines 

 or setae, cover tlie entire tarsus and metatarsus of the first and 

 second leg, tarsus and distal half of metatarsus in the third leg-, 

 tarsus and distal ^/j of metatarsus in the fourth leg. The spines 

 are variable. The tibiae of the front legs with two hooks directed 

 downward and a little inward. The claws are in both sexes small 

 and smooth and entirely concealed by the well developed fasciculi 

 unguiculares. The spinelike hairs on the anterior coxae are still 

 better developed than in the female. The structure of the palpal 

 bulb is apparent from the drawings (Textflg-. C and D). 



Fig. C. Palpus. 



Fig. D. Palpus. 



The s e n s e s. 



It seems to be quite certain that neither sex is able to perceive 

 either low or high sounds. At least they never react. If a male 

 cricket is placed in the same box with a Dugesiella which has 

 been kept hungry for several days, it will sing for hours sitting 

 quite close to the tarantula without attractiug the latter's attention, 

 but let it touch the tarantula and it will be at once attacked. 

 Sounds produced by a stringed Instrument or a tuning fork remain 

 without effect unless the bottom of the box is set vibrating. The 

 sense of smell, also, seems to be, if not quite absent, at any rate 

 very poorly developed. Only strong irritants such as formalin, 

 glacial acetic acid, osmic acid, chlorine und some oils (clove, lavendar, 

 bergamotte) when brought on the end of a glass rod close to the 



