198 SUPPLEMENT TO 



from the fact of the same type heing adopted in- 

 differently by both nearly- and most distantly-related 

 spiders, that the form of the nest is governed far 

 more by the conditions which it is contrived to meet, 

 than by the affinity or resemblance of the spiders 

 which construct it. 



Ihave found N. Moggridgii at San Eemo, Mentone, 

 Cannes, Hyeres, and Marseilles, but thus far, I only 

 know of the true N. ccementaria at Montpellier. 



The latter spider is rather bolder than the former, 

 and I frequently saw it at Montpellier watching at 

 the slightly raised door, with the tips of the claws 

 projecting from the nest, and it rarely failed to 

 resist most vigorously any attempt of mine to force 

 the door open. 



During the summer of 1873, I received two speci- 

 mens of trap-door nests from California. Both of 

 these nests were of the cork type and nearly entire, 

 wanting only a small portion of the base of the tube ; 

 they most closely resembled one another and were 

 probably the work of the same spider. For one 

 of these, coming from the San Joaquin valley, 

 between the Calaveras and the Tejon, I have to 

 thank M. J. C. Puis, a Belgian entomologist residing 

 at Ghent ; and for the other, containing the spider 

 which had constructed it alive ivithin its tube (!), I 

 am indebted to Mr. G. H. Treadwellof San Francisco. 

 The former nest is drawn at iig. A, Plate XV., and 

 the spider"^ from the latter at fig. B of the same 

 plate. 



Mr. Treadwell had carried this spider and its nest, 



* This s[)i(lcr, which proves to be a uew species, is described below (p. 2G0) aa 

 Cteniza Callfornica. 



