MYRI0P0DA OF THE MERGTTI ARCHIPELAG-O. 



293 



species that the long series of forms from which the above de- 

 scription has been taken shows well to what an extent characters 

 which have been regarded as valuable for the separation of 

 species may vary with age in individuals which are without 

 doubt specifically identical. 



G-enus Paradesmits, Sauss. Linn. Entom. xiii. p. 325. 



Parade smtis Karschi, sp. no v. (Plate XXIV. figs. 5-5 b.) 



Length about 43 mm., width about 5 mm. 



Colour : the auterior cyliudrical portion of each somite very 

 dark chocolate-brown above and at the sides ; testaceous beneath. 

 Upper surface of keel-bearing portion yellow with brown anterior 

 margin ; lateral portions brown ; sternal portion testaceous. 

 Upper and under sides of keels testaceous. First dorsal plate 

 testaceous, with patch of brown colour towards the anterior 

 margin. 



Legs pale brown ; head and antennae black. 

 Body smooth and shining. 



Keels horizontal, with very thick lateral margin, upon which is 

 situated the foramen repugnatorium. Keels of the first segment 

 well developed and not projecting below those of the second. 



First dorsal plate more than double as wide as it is long ; very 

 nearly as wide as the second, and double as long as the keel- 

 bearing portion of the second. 



Head with a median longitudinal sulcus. 



Each dorsal plate bearing a transverse sulcus, running from 

 the base of one keel to the base of the other. Posterior somite 

 triangular, truncate, with an anterior larger and a posterior 

 smaller tubercle on each side ; subanal plate bituberculate. 



Copulatory foot of the male slender and curved, terminating 

 with two hooked dissimilar processes : the posterior of these two 

 processes is wider and at the apex tridentate ; the anterior, 

 slender and pointed, is closely adherent to the posterior. 



Five male and five female adult specimens, preserved in spirit 

 of wine, from King Island and Sullivan Island. 



The form of the copulatory foot shows that this species, which 

 I have named after Dr. Karsch, is closely allied to Paradesmus 

 vicarius (Karsch, Archiv f. Naturg. 1881, p. 38). 



Paradesmus cructfer, sp. nov. (Plate XXIV. figs. 6-6 b.) 



Length about 60 mm., wddth about 5 mm. 



Colour : upper surface of each somite pale reddish brown, with 



