PLATE XIII. 



1. Synchaeta Baltica . 

 la. ,, 



2. Synchasta treirmla . 

 2a. 



26. 

 2c. 

 Zd. 



3. Synchaeta pectinata . 

 3a. 



36. 



3c. 



4. Synchseta oblonga . 



5. Polyarthra platyptera 

 5a. ,, 



56. 



5c. 



5d?. ,, ,, 



5e. 



5/. - 



5<7- 



57*. 



G. Triarthra longiseta . 



6. 



66. 



Gc. 



6rf. 



Ge. 



C/. _ 



7. Triarthra breviseta . 

 la. 



8. Triarthra mystacina 



9. Pteroessa surda 

 9a. 

 96. 



10. Pedetes saltator 

 10a. 



dorsal view 



front view .... 



dorsal view .... 



side view .... 



hind extremity, with antennae 



male 



mastax ..... 



dorsal view .... 



front view .... 



lateral canal and vibratile tags 



dorsal antennae 



dorsal view .... 



dorsal view .... 



side view . . . 



the same, with male eggs 



mastax and resophagus . 



plume ..... 



the same ; the tip enlarged 



mastax ; side view . 



mastax ; ventral view 



males 



side view .... 



gastric gland .... 

 eye and pigment 

 striated muscle 

 extremities of spine 

 side antenna .... 

 ephippial egg .... 

 side view ..... 

 dorsal view .... 

 obliquely ventral view 

 empty lorica ; side view . 

 the same ; dorsal view (?) 

 the same ; ventral view (?) 

 dorsal view .... 

 side view 



G 

 G 

 H 

 H 

 H 

 H 

 G 

 H 

 H 

 H 

 H 

 G 

 H 

 H 

 G 

 G 

 G 

 G 

 G 

 G 

 G 

 H 



H 



H 



H 



H 



H 



H 



G 



G 



G 



G 



G 



G 



G 



G 



