Spiders and Their Near Relatives 



at the tips, the whole forming an oval figure. The eyes are visible 

 from above. 



Dcndrolasma mirabilis (D. mi-rab'i-lis). — The colour of 

 the body is brown or black with the venter paler; the projecting 

 part of the eye-tubercle and the club at each side are whitish. 

 The sides and the hind margin of the cephalothorax are armed 

 with a row of tubercles which are more or less connected, 

 and there is a square of similar tubercles just behind the eye- 

 tubercle. The dorsum of the abdomen has also many series of 

 tubercles. The length of the body is one eighth inch. This 

 species was discovered in Washington State and is the only known 

 one of the genus. 



Order ACARINA (Ac-a-ri'na) 

 The Mites 



In this order the abdomen is unsegmented and is not con- 

 stricted at the base, but is broadly joined to the cephalothorax, 



v^Y^M2 



Fig. 60. THE [TCH-MITE 

 a, from below b, from above 



with little or no indication of a division 



between these two regions. The result of 



this is that the entire body often presents 



a more or less sac-like appearance. (Fig. 60.) 



In many members of the order, however, 



the body is divided into two regions which 



are commonly termed the cephalothorax and 



the abdomen (Fig. 61). But these regions do not correspond 



to those bearing the same names in the other orders of the 



8j 



Fig. 61. 



BDELLA PEREGRTNA 



(after Banks) 



