I08 C. W. STEVENSON. 



spinnerets d. The ducts of these glands end on the same kind 

 of spools, the spools having three parts, Fig. 2, a short flexible 

 part, then a short heavy chitinous basal piece which terminates 

 in a long spinning hair. According to Apstein's classification, 

 these glands would be piriform glands, being pear-shaped and 

 ending on a spool with short thick base, but differing in having 

 a long spinning hair. 



Of the two pair of spinnerets, the posterior consists of three 

 joints, while the anterior has only one short piece. These spin- 

 nerets bear spinning spools only on the ventral surface. On the 

 posterior pair. Fig. 3, the spinning spools seem to be about 

 equally distributed over the whole ventral surface, thereby dif- 

 fering from most spiders. On the anterior pair. Fig, 4, the 

 number of spools seem to correspond with the number of glands 

 which empty into it. 



The females of two other genera of this same family were dis- 

 sected, Stichoplastus (?) and Myrnieciophila, and these were found 

 to agree in general with Evagrus in having only two pairs of 

 spinning glands, composed of piriform glands. 



In Stichoplashis, the glands of the posterior spinneret were 

 similar in position and number to those of Evagrus but were a 

 little larger and curved in shape. As to the glands of the an- 

 terior spinneret, they were about twelve in number, differing 

 from Evagrus in that they varied in size, four being larger and 

 far apart, and eight posterior, small and closer together. In 

 Myrmeciophila, the glands were exactly similar to Evagrus except 

 in number, Myrmeciopliila possessing about 25 or 30 glands to 

 the anterior and 150 to 200 to posterior pair of spinnerets. 



The primitiveness of these Theraphosids is shown in the limb- 

 like elongation of the spinnerets, and in the possession of only 

 two pairs of spinning glands, one pair to each pair of spinnerets, 

 both of which are made up of the same kind of glands. 



The only Theraphosids whose architecture has received much 

 attention are the trap-door spiders ; accordingly it may have some 

 value to give a brief accout of the web and cocoon of Evagrus. 



The web is always placed on the ground under large rocks, and 

 generally in shady places where there is moisture. It seems that 

 this species stays in colonies. Often a colony is found in one 



