130 KKCOKOS (IF TllK AL'.STIJALIAN M L'SKL.M. 



anterior. Marginal .sulcus verv short and weak, i-nnniug close 

 to the niai'gin. Ventral surface of second segment somewhat 

 excavated, swollen on each side, with shallow sulci. Anterior 

 concealed parts of prozonites covered with minute and dense 

 strife, yet shining; rest of the zonites punctured, more distinctly 

 on the posterior part of the prozonite than on the metazonite, 

 the punctures intermingled with faint longitudinal strise. 

 The latter are more numerous on the anterior six segments. The 

 posterior parts of the prozonites show moreover irregular, wide 

 and shallow wrinkles, two of which stand in front of the pores 

 and ai-e moi'e deeply impressed. Distinct oblique and longi- 

 tudinal striae are to be found only far down below the pores. 

 Transverse sutural sulcus completely obsolete on the back, 

 scai'cely visible above and below the pores as a tiny threadline. 



Pores starting from the sixth segment, small, opening high 



in the sides, in the middle of a raised spot, wherefrom they 



appear to be margined. On a level w-ith the pores is a very 

 faint longitudinal sulcus, crossing the whole segment. 



Last tergite with its posteiuor margin angularly pioduced ; 

 the process is feebly depressed at its base, and does ;idt conceal 

 the upper angles of the valves. Valves moderately prominent, 

 scarcely globular, compressed in the vicinity of the margins, 

 causing the latter to appear pad-shaped. Anal sternite 

 I'ouuded, very broad, its length equal to about one-fourth of 

 the breadth, Avith a weak transverse sulctis near its base. 

 Ventral plates of the othei' segments ti-ansvei'sely sulcate : the 

 sulci weak. Stigmata small. 



Legs moderately slioit, rather slendei', with but one ventral 

 bi-istle on each joint except the last. 



Male : — Femora of the second pair flattened inwai'dly, with 

 gibbous ))osteiior surfaces. Coxa? of third, four and tifth j»air 

 pi'oduced. Tai'si not padded. 



Copulatory aji])endages (PI. xviii.. tig. 47, 48) : — \'entral 

 plate of anterior goiio])ods (]'.) senii-circulai", twice as w^ide as 

 long, tipped with a digitiform, tapering ]»rocess as long as the 

 semicircular basis, with undulate sides and w-ith apex not even 

 half the breadth of its root. Distal angle of the coxal expan- 

 sion scarcely reacliiiig flic niiiidlc i<\ the process of the ventral 



