106 U.S. NATIONAL MUSEUM BULLETIN 236 



17. 2nd exopodal segment of leg 1 very strongly swollen, seta inserting at middle 

 of swelling. Exopodite of leg 5 with transverse rows of spinules. 



S. plumosiim Brady 

 2nd exopodal segment of leg 1 less strongly swollen, seta inserting under the 

 swollen part. No transverse rows of spinules on exopodite of leg 5. 



S. intemiedium NichoUs 

 MALES 



1 . Exopodite of leg 5 with a total of 4 appendages 4 



Expodite of leg 5 with a total of 2 or 3 appendages 2 



2. External marginal spines of 3rd exopodal segments legs 2 to 4 lancet- 



shaped 3 



External marginal spines of 3rd exopodal segments legs 2 to 4 normally 

 developed, not lancet-shaped S. longicauda (Phillippi) 



3. Exopodite of leg 5, 2 times as long as wide, with 3 setae, 2 of which are 



setose. Leg 6 composed of a lancet-shaped spine and 1 seta. 



S. plumosum Brady 



Exopodite of leg 5, l}i times as long as wide, with 3 thick setae. Leg 6 



composed of 1 thick spine and 2 setae S. intermedium (Nicholls) 



4. One of the setae on exopodite of leg 5 lancet-shaped 5 



All setae on exopodite of leg 5 normally developed 6 



5. 2nd segment of endopodite leg 1 much shorter than segment 1. 



S. australe (T. Scott) 

 1st and 2nd segment of endopodite leg 1 of about the same length. 



S. ligusticum (Brian) 



6. 2nd segment of endopodite leg 1 shorter than segment 1 . S. arthuri Poppe 

 1st and 2nd segment of endopodite leg 1 of about the same length .... 7 



7. 2nd endopodal segment of legs 3 and 4 with 1 seta . S. hippolytes (Kr0yer) 

 2nd endopodal segment of legs 3 and 4 with 2 setae . S. lamellipes Monk 



Scutellidium dentipes, new species 



Figures 34-36 



Material. — Loc. 431, 1 ov. 9, 0.45 mm. 



Description. — The following has been taken from the only female 

 specimen captm'ed (holotype), which, after having been figm-ed in 

 dorsal aspect, has been dissected and mounted. 



Adult female, total length 0.45 mm.; greatest diameter 0.23 mm. 



Body strongly built, compressed dorsoventrally, with large cephalo- 

 thorax, distinctly separated from much narrower abdomen, reaching 

 half length of cephalothorax (fig. 34). Head and 1st thoracic somite 

 completely fused to form cephalic somite, slightly longer than com- 

 bined lengths of thoracic somites 2 to 4. Greatest diameter of body 

 at end of cephalic somite, body slightly narrowing posteriorly, frontal 

 part broadly rounded. Rostrum invisible from above, present as 

 triangular plate with rounded apex, pointing downward. 2nd and 

 3rd thoracic somites of same size, 4th slightly smaller, lateral part 

 slightly concave. Some hairs along lateral thoracic border of thoracic 

 somites 2 to 4. 



