(HAMiu.ni.ix: IfTBIOPODi OF THE AUSTRALIAN REGION. l. r )U 



424. hi. is 1,1 >< i s Meinert. 

 Nat. tidnki., 1868, 3. R., p. 9. 



Diploiulus luSCUt Silvcshi, PaUDB 1 l:i\v:iiiniMS L904, 3, p. '.YAH. 1 



Locality. Hawaiian Islands: Hawaii: Komi. 1 



A common European species without doubt introduced by man. 



CAMBALOIDEA. 



( 'AMBALIDAE. 

 425. DlMEROGONUS ATER, sp. nOV. 



Type.— M, C. Z. 4,823. New Zealand: Day's Bay, near Welling- 

 ton (W. M. Wheeler). 



Differs in many features of the gonopods from D. insulanus Attems. 

 The median plate of the anterior pair is smaller and narrower; it has 

 the anterior end mesally acutely incised. The mesodistal process of 

 the coxa! piece of anterior gonopods differs; the membranous lobe 

 adjacent to this process on ectal side is more slender, not pointed 

 distad, and is longer, much exceeding the distoectal lobe on the end 

 of which, instead of short hairs, there is a series of many long setae 

 like those of the posterior or distal branch of the gonopod. The 

 latter branch instead of being subvertical extends obliquely from its 

 attachment distomesad, its distal end lapping over the tip of the pos- 

 terior gonopod as well as concealing largely the pseudoflagellum; with 

 long setae at the end. The posterior gonopods somewhat inter- 

 mediate between the form in D. insulanus and orophilus, the distal 

 joint not sharply set off, a somewhat curved and slightly twisted 

 thin process extending beyond the stouter, distally truncate and seti- 

 gerous lobe representing the end of the first or principal joint, the 

 setigerous lobe being smaller than in D. orophilus and larger than in 

 insulanus. 



The general color is solid black throughout, excepting the middle 

 part of collum and lower part of face, the extreme caudal margin of 

 the anal scutum and the legs and antennae which are ferruginous; 

 also an annulus about the caudal border of each segment is paler; the 

 anterior region of annulus of ferruginous cast. 



Number of segments, fifty-two. 



Diameter (male), 3 mm. 



