166 bulletin: museum of comparative zoology. 



lateral margin as more usually the case; a short stria below it and one 

 or two short ones above. 



Anal valves not at all margined. 



Number of segments, fifty-five. 



Width (female), 3 mm. 



EuETHOGONUs, gen. nov. 



Differing from Amastigogonus Brolemann and Dimerogonus At terns in 

 having the first pair of legs of the male armed with a distinct claw and the 

 proximal joint not especially enlarged. In gonopods the characters are most 

 like those of Amastigogonus. No distinct median plate; the tracheal stalks 

 meeting directly at the middle line. Anterior gonopods with two long joints; 

 a pseudoflagellum, this lying between these joints in a cavity which they form, 

 rising to near the distal end of the gonopod but not protruding, slender and 

 needle-hke, not ribbon-shaped as it is in Amastigogonus. The posterior 

 gonopods one-jointed as in the latter genus. Mandible with eight pectinate 

 lamellae. 



Genotype. — E. hardyi, sp. nov. 



446. Euethogonus hardyi, sp. nov. 



Type.— M.C.Z. 4,817. Paratypes.— M. C. Z. 4,818. Tasmania 

 (G. H. Hardy). 



General color black, in the anterior region the prozonites often paler, 

 particularly down the sides, from the inclusion of numerous hght dots. There 

 is also a tendency for the caudal border of the metazonites to be lighter, 

 especially in a stripe down each side. Legs ferruginous. Antennae blackish. 



Sulcus across vertex of head distinct. Eyes transversely elongate, the 

 mesal end angular, separated by less than twice their diameter. Ocelli in 

 four transverse rows; e. g., 9, 8, 7, 6. Setigerous foveolae eight. Antennae 

 reaching to the fourth segment. 



Collum moderately narrowed below, the anterior angle widely rounded. 

 Margined below and up the anterior border to the level of the eye. Above the 

 lower margining sulcus are two deep longitudinal sulci of which the upper 

 one curves up dorsad at its anterior end. 



The transverse suture of segments strongly marked throughout. Pore 

 well removed caudad from the suture which remains straight or but slightly 

 widely curved opposite it. The covered part of the prozonites densely marked 

 with fine transverse striolations which are closely beaded with shining granules; 

 these striolations also on the anterior part of the exposed region of the pro- 

 zonites above, extending back farther on the sides ; on lower part of prozonites 



