140 bulletin: museum of comparative zoology. 



latter species the telopodite is uncate distally, curving mesad and then proxi- 

 mad and again ectad. At the beginning of the distal curve a flat, slender, 

 acute blade arises which runs mesad and curves but little beyond its base. 

 Dorsad of this the principal strongly curving branch divides near the middle 

 of its length, sending caudad a branch which abruptly expands beyond its 

 base into a plate malleiform in outline, the plate giving rise from its caudoectal 

 corner to a slender acute style; the process beyond this branch continues as 

 a slenderly pointed style the tip of which curves back ectad as mentioned. 

 Length (male), near 37 mm.; width, 6.5 mm. 



The gonopods somewhat suggest those of P. (Eutrackyrachis) 

 viargaritatus Pocock, a species also described from New Guinea (Vic- 

 toria Mountain). 



383. Platyrrhacus ancylogon, sp. nov. 



Type.— M. C. Z. 4,675. Paratypes.— M. C. Z. 4,676. Dutch 

 New Guinea: Manokwari (Thomas Barbour). 



Deep chocolate to nearly black with a broad continuous median longitudinal 

 yellow or testaceous stripe. 



Head with a distinct but not sharply impressed vertigial furrow. Surface 

 densely granular. Antennae reaching to third segment. 



Collum wider than head. Decidedly widest anteriorly where it projects 

 angularly on each side beyond a subquadrate posterior portion. Anterior 

 margin straight except for a weak curving at the ends; caudal margin straight. 

 Over the anterior border a series of larger tubercles behind which the plate is 

 depressed; larger tubercles also along the caudal border. Surface in general 

 densely tubercular or granular. 



The anterior keels strongly bent forward. Caudal angles in general a 

 little more acute than a right angle but obviously produced only on the most 

 caudal segments. The lateral margins with large angular teeth lower on the 

 second and immediately succeeding plates, there being on second and third 

 two triangular teeth in addition to those at the corners. On the fourth and 

 immediately succeeding plates a broader and deeper incision which is less 

 obvious farther caudad where the margin appears slightly concave from end 

 to end and may bear more teeth, the number increasing to three and four 

 between the large corner angles. Pore-ring rather small, remote from the 

 margin, in the anterior region being nearly three times its diameter to the 

 bottom of the nearest incision and in the posterior region rather less than 

 once and a half. 



The tergites are coarsely granular over the keels and lateral part of dorsum 

 of metazonites, the tubercles or granules becoming smaller and fewer mesad, 

 the median yellow region being almost smooth. 



Anal scutum convex and elevated at base caudad of which flat. Shghtly 



