385 



with a single larger rufous or flavous spot on each side behind the 

 pore , and with sometimes faint traces of a median dorsal spot of the 

 same colour; anal somite paler, the posterior half of the valves and 

 sometimes the caudal process being ferruginous. 



Head smooth and shining; vertex sulcate; with a fine transverse 

 series of striae; with two or three small labral punctures on each 

 side; eyes separated by a distance a little greater than a diameter, 

 composed of about 80 ocelli. Antennes in 9 reaching just beyond the 

 Collum, in the d" reaching beyond the second somite. 



Somites smooth and polished; collum moderately narrowed laterally, 

 its anterior angle square in the cT with thickened margin, obtuse in 

 the 9 with margin of the same thickness throughout; its posterior 

 margin lightly concave, more so in the cT than in the 9, almost 

 without stria?. The transverse sulcus of the other somites feeble, some- 

 times almost obsolete dorsally, the anterior portion concentrically striate 

 in front, the posterior portion longitudinally striate inferiorly; pores 

 minute, situated in a sinuation of the transverse sulcus ; ventral grooves 

 long, but scarcely as long as the two basal segments of the legs. 

 Anal somite produced above into a relatively slender, pointed, apically 

 upcurled caudal process which projects beyond the anal valves; valves 

 convex, with compressed, convex border; sternite angled behind and 

 fused with the preceding sclerite. 



Number of somites in 9 69 — 71, in cT 68: length up to about 

 200 mm. 



The single specimen obtained at Muka-Muka is a small 9 measuring 

 only about 109 mm. in length but being provided with 71 somites; 

 the colour of this example is paler and the median dorsal series of 

 spots is more pronounced, moreover the anal somite appears to be 

 larger in proportion than in large examples. 



84. Thyropygus pachyurus sp. n. PI. XXII, 21 — 21 b . 

 Sumatra: Manindjau and Muka-Muka. 



Colour (in alcohol) ; head olivaceo-fuscous above, ferruginous beneath ; 

 legs and antennas flavous, a little darker at the base; somites olivaceo- 

 piceous, with ferruginous posterior borders and olivaceo-cinereous 

 anterior half, anterior border of collum ferruginous; caudal process, 

 posterior border of sides of tergite and margins of valves flavous. 



Head and face smooth and polished , vertex with conspicuous sulcus, 



