A MITE FROM THE SOUTHERN SEA LION 



323 



opisthosoma striated as in H. rosmari, also one or two minute hairs scattered on the 

 surface as in the latter species. 



Epistome triangular, asymmetric, showing a certain amount of variation in individual 

 specimens (Figs. 5a, b). Hypostome with 10-12 rows of teeth. 



Chelicerae (Fig. 6) : first article nearly as long as broad, second two and a half times 

 as long as broad, as in H. rosmari (in general, this appendage bears more resemblance 

 to H. rosmari than to any of the other species of Halarachne). In addition to the tibial 



Fig. 5. Epistome 

 of female. 



Fig. 7. Maxillipalp of female. 



Fig. 6. Chelicera 

 of female. 



fringe there are five short, stout teeth. Even under oil immersion it is difficult to decide 

 whether these teeth are in line with the tibial fringe or distinct, but they appear to be 

 distinct. The digitus fixus barely reaches one-third the length of the digitus mobihs ; 

 it is slender and sHghtly bifid at the extremity; proximally a small membranous flap 

 projects over the base. Digitus mobilis pointed, with small accessory projection at a 

 short distance from the tip and bearing a broad leaf-shaped membrane drawn out at 

 irregular intervals into long, sharp spikes. This membrane is strengthened by thickenings 

 in the nature of a mid-rib. 



Malae externae large. Third and fourth articles of maxillipalps (Fig. 7) each with four 

 hairs; terminal article with the usual forked hair and numerous short hairs. 



