384 



half brunneo-piceous with ferruginous border and with an almost 

 obsolete paler spot in the dorsal middle line, caudal process and mar- 

 gins of valves flavous. 



Head and face smooth and shining, marked above with a vertical 

 sulcus and the ordinary transverse series of striée ; labral margin with 

 about 6 punctures; eyes separated by a distance greater than a dia- 

 meter, composed of about 55 ocelli. Antennœ moderately long , reaching 

 beyond the collum but not so far as the hinder border of the second 

 somite. 



Somites smooth and shining; collum somewhat small, narrowed laterally 

 almost to a point, its anterior margin defined by a sulcus as high 

 as the eye, otherwise not sulcate; the second somite wide and long, 

 much wider than the collum and laterally stretching below it; the 

 third somite also very wide and long but not so wide as the second, 

 its upper surface posteriorly widely and deeply emarginate ; the 4 th , 5 th 

 and 6 th becoming gradually like the rest of the series ; the rest marked 

 with complete transverse groove, the anterior half concentrically 

 striated in front, the posterior half longitudinally striated below nearly 

 as high as the pores; pores minute situated just behind a sinuation 

 of the sulcus ; ventral grooves long , about twice as long as wide , and 

 about as long as the two basal segments of the legs. Anal somite 

 produced above into a slender, pointed, apically upcurled process 

 which, continuing the line of the dorsum, projects beyond the anal 

 valves; anal valves convex, with margins also convex and strongly 

 compressed throughout; sternite posteriorly angled and fused with the 

 preceding sclerite. 



Number of somites 62; length about 125 mm.; width of face by 

 eyes 6 mm.; of second somite 10 mm. of sixth somite 7.5 mm. 



cf. (Young) with 61 somites, measuring 1 L3 mm.; antennae stretching 

 to the end of the second somite, which is not enlarged; anal valves 

 posteriorly black; copulatory feet not fully developed. 



83. Thyropygus erythropleurus , sp. n. PI. XXI, fig. 6 — 6 b . 

 Sumatra: Manindjau and Muka Muka. 

 Colour (in alcohol); head piceo-olivaceous , ferruginous infenorly; 

 antennœ of the same colour as the head, very narrowly fiavo-annulate ; 

 legs fuscous, fiavo-annulate, the distal extremities of the segments 

 being flavous, somites anteriorly olivaceo-cinereous ; posteriorly piceous 



