212 July' 



about one huudred species of Pselcqjhidae, but only two of them 

 belong to the Clavigerinae, which shows how rare they apparently are. 

 No species of this sub-family has up till now been recorded from 

 Borneo or Ceylon. Without the aid of the many fine works by Eaft'ray 

 on Pselaphidae, which I have consulted, this paper would never have 

 been published. I am indebted to Mr. Donisthorpe for the names of 

 the ants mentioned below, which have been determined by M. Forel. 

 The types of these insects were from Sumatra. 



Disarthricerus mouJtoni sp. n. (Plate XIX, figs. 1, la, b). 



(J . Dark reddish brown, oval, rather convex, attenuated in front. Head 

 longer than broad, svib-cylindrical, rounded anteriorly, convex, the iinderside 

 dilated in an obtuse angle, with sides oblique ; above, between eyes to apex, 

 rugosely punctured, and with short golden setae ; behind eyes to base smoother ; 

 eyes very large and prominent, placed a little behind middle. Antennae with 

 two joints, about as long as head ; 1st joint hidden. 2nd large, cylindi'ical, 

 gradually widening from base to apex, with apex rounded, and with long pale 

 pubescence. Prothorax widest at base, rather strongly punctxired, angled at 

 base. Elytra large, about as broad as long, rounded, and reticulate. Abdomen 

 with first dorsal segment very large, the only one visible when viewed from 

 above, narrower at base and shorter than the elytra, with the sides margined, 

 obliqvie and rounded at apex, slightly depressed on each side at base, punctate, 

 setose. Meso- and metasternum strongly punctured at sides. Ventral segment 1 

 short ; 2 much longer ; 3, 4, and 5 each shorter than 2, and about eqixal to 

 each other; 6 a little longer. Legs short and bioad ; intermediate femora (see 

 fig. lb) dilated and armed on the under-side with a process bearing two spurs 

 branching in opposite directions ; tibiae narrowed at base, the intermediate pair 

 with a small tooth near apex ; tarsi three-jointed : 1 and 2 very short, 3 long and 

 with single claw. Length 1.20 mm. 



$ . Differs in having the intermediate femora less dilated and unarmed, 

 the abdomen more rounded, and the sixth ventral segment more transverse. 



Hah. : Sarawak, Mt. Matang, alt. 1,000 ft. (1 J', 30.i.l4; 1 $ , 

 6.xii.l3) . In the nest of a small blue-black ant, Prenolepis (Nylanderia) 

 hutteli Forel, var., on the ground under dead leaves. 



I have great pleasure in naming this species after Mr. J. C. Moulton, 

 to whom I am greatly indebted for all the trouble he took to make my 

 collecting expedition to Sarawak such a great success. D. monUoni 

 differs from D. integer Kaffr. (of which Mons. RafEray took a single $ 

 at Singapore, on which he founded the genus) by the very different 

 shape of the second joint of the antennae, the form of the thorax, and 

 the less rounded abdomen. I have taken two specimens at Penang of 

 another species very like B. integer, but with a somewhat diiferently 

 shaped thorax ; it is not advisable, however, to describe it without 

 seeing Kaffray's type. 



