291 



W. Muller (in 1886) gave a vory useful termininology which 

 also stands in oonnection witli tliat of Weismann. He distinguishes 

 the füUowing „primary bristles" (see PI. X, fig. 1, 2, 3. after 

 W. Muller). 



On an abdoniinal segment. 



1. on the back, next to the dorsal line. 



2. a little ventrad and caudad of 1. 



3. above the stigma. 



4. behind the stigma. 



5. under the stigma. 



6. where we woiild expect the leg on the legless segments. 

 On the thorax : 



1, 5, 6 as on the abdomen ; 3 and 4 blended into one, 2 is wanting. 



The spines have names and are called after the stripes along 

 their base. The dorsal line can be single or doublé. He distinguishes : 



Dorsalia (D. s.) viz. D. s. ant. if they are situated in front of, 

 and D. s. post.^ if they are lying behind the connecting line be- 

 tween the right and left subdorsal. 



Suhdorsalia (S. d. s.) the spines which are situated half way 

 between the dorsalia and the stigma. 



SHprastignialia (Sst.) and Infrastigmalia (Ifst.) are determined 

 by the situation of the stigma. 



Pedalia under the infrastigmalia. 



Though Muller makes a distinction between the spines of the 

 Saturnidae which arise from the primary setae and those of the 

 NympJialidae which do not come frora those setae, he thinks 

 (1. c. p. 246) that the names given in the first case may be kept. 



Scudder (1889) did not give names to the setae but only to the 

 stripes (see chapter H). 



Independently of Muller, Dyar proposed a new nomenclature 

 in 1894, in which he purposely neglected the first instar, as it is 

 „a generalized condition of tubercles and setae", and it is not at 

 all certain „that the character of presence or absence of this 

 generalized first stage has any special phylogenetic significance" 

 (1. c. p. 196). 



