NO. 1701. 



NORTHWEST PACIFTC IROPOnSl—RICHARDFiON. 



117 



k 



The first segment of the thorax is provided with three spines, one 

 in the middle on the 

 anterior margin and 

 one at the antero- 

 hiteral angle on either 

 side. The median 

 spine is ahont twice 

 as long as the lateral 

 spines. The second, 

 third, and fourth seg- 

 ments are each pro- 

 vided with three 

 spines, one median 

 spine on the anterior 

 margin and a spine 

 on either side on the 

 anterior margin close 

 to the lateral margin ; 

 these spines are all of 

 nearly equal length ; 

 the epimera of these 

 segments are drawn 

 out in two spines, an 

 anterior spine and a 

 posterior spine, t h e 

 anterior one being 

 twice as long as the 

 posterior one. The 

 three following seg- 

 ments are each fur- 

 nished with three 

 spines in a transverse 

 row near the poste- 

 rior margin, a median 

 small spine and one 

 on either side, some 

 distance from the lat- 

 eral margin ; the lat- 

 eral spines are longer 

 t h a n t h e media n 

 spines and decrease 

 gradually in length 

 from the fifth to the 

 seventh segments ; 

 the antero-lateral an- 

 gles of these last three segments are produced in an extremelj^ 



Via. ?.S. 



-MiCROPROTUS C^ECUS. X ■ 



V. Dandridge.) 



(Drawn by Miss 



