101 



13 '. At least one transverse list between head and trunk behind the base of the maxillipeds . . 14 



14. Head with naked lateral margins (margins of the lateral borders) 15 



14'. Head with hairy lateral margins 16 



15. Antennulae rather short and clumsy. Sub-median skeleton without a process at the 

 basal inner angle of the maxillipeds 14. S. Metopes n. sp. 



15'. Antennulae moderately long and slender. Sub-median skeleton with a small process at 

 the basal inner angle of each maxilliped 18. S. Gitanopsidis n. sp. 



16. Exceedingly short hairs on the lateral margins of the head. Basal joint of the maxil- 

 lipeds moderately short and stout 17 



16'. Moderately long hairs on the lateral margins of the head. Basal joint of the maxillipeds 

 long and slender 22. S. Amphilochi n. sp. 



17. Caudal stylets behind or on the posterior margin of the ring of the genital area. 



19. S. Giardii n. sp. 



17'. Caudal stylets at some distance in front of the posterior margin of the ring of the 



genital area 20. S. Bonnieri n. sp. 



2. Conspectus of the Males known. 



1. Dorsal surface of the trunk with (at least) a transverse line or belt of hairs, or covered 

 with hairs all over 2 



1 '. Dorsal surface of the trunk quite naked 26. S. microcephala 



2. Frontal border with two very deep and broad incisions dividing it into three plates, 

 the median one of which is large, long and broad and nearly square, the lateral ones 

 much shorter Group of S. Leuchartii 



2'. Frontal border not deeply incised, the margin crenate or entire 3 



3. Frontal margin crenate, forming six lobes of which the most external ones are low. 



9. 8. Ccdliopii 

 3'. Frontal margin entire 4 



4. Trunk covered with single hairs or with (at most) 3-branched setaceous hairs (3 hairs 

 proceeding from each tiny knot) 5 



4'. Trunk covered with tiny oblong transverse knots, from each of which proceed about 

 ten very fine hairs, radiating backward and sideways 25. S. frontalis 



5. Each caudal stylet with a very conspicuous seta, which is from about thrice to many 

 times the length of the stylet 6 



5'. Each caudal stylet with two or three moderately short setae, none of which is very 

 conspicuous, and not thrice the length of the stylet 12 



6. First pair of legs 1-branched, the branch ending in a long seta 7 



6'. First pair of legs 2-branched, the outer branch ending in a long and a shorter seta, 



the inner branch in a conspicuous, shorter or longer terminal seta 9 



