3S IPHIAULAX AJSD CHAOLTA. 



dibles with the basal half rufo-testaceous. Head and median 

 segment covered with black hair ; the middle lobe of meson- 

 otum is covered with shorter pubescence ; it is clearly separated 

 from the lateral lobes by the parapsidal furrows which are 

 deep, clearly defined and reach close to the apex. The apical 

 slope of the metanotum has a distinct curved furrow on either 

 side, with a few irregular ones between. 



The wings in this species are lighter coloured than in the 

 others of the group. 



h. Black ; head, more or less of thorax, and 2 or 4-f'ont legs red ; 

 wings uniformly dark fuscous. The group of I. shelfordi. 



Iphiaulax mobilis, sp. nov. 



Black ; the head, thorax, fore legs and the greater part of the 

 middle tibiae red, wings fuscous, the nervures and stigma black ; 

 basal area of 2nd. abdominal segment longer than its width at 

 the base, opaque closely longitudinally striated, with a smooth, 

 shining space, longer than broad and acutely pointed at the 

 apex, the apex of the 1st. the 2nd. and the 3rd. and -4th. abdominal 

 segments, except broadly on the sides at the base, closely longi- 

 tudinally striated, the suturiform articulation and the.furrow on 

 the base of the 4th. segment crenulated. 



Length 16 mm. ; terebra 40 mm. 



Hob. Kuching ; April. 



Face closely and distinctly punctured : the middle of the 

 lower half smooth, the smooth part rounded above; top of cly- 

 peus transverse, the sides oblique, upper half smooth, lower- 

 punctured. Front depressed and smooth in the centre and with 

 a longitudinal furrow ; its sides punctured. Temples oblique, 

 rounded. Antennal scape as long as the 2nd. and 3rd. joint united ; 

 its apex on the lower side slightly produced. Middle lobe of 

 mesonotum cleaii}^ separated, the furrows reaching to the apex. 

 Basal depression of 1st. abdominal Sf^ment and the base of the 

 apical part broadly in lhe centre smooth, the middle with a long- 

 itudinal keel, with some irregular, m< stly transverse keels on 

 either side. The centre of 2nd. segment irregularly reticulated 

 more closely on the inner than on the outer side where the keels 



Jour. Straits Branch 



