IPHIAULAX AND CHAOLTA. 47 



longitudinally striated ; the base roundly narrowed ; there is no 

 area, but the centre at the extreme base is smooth and shining, 

 the apex of the segment being also smooth ; the third segment is 

 similarly formed, the basal half in the centre being roundly 

 raised, the raised part being more rounded and more clearly 

 separated than it is on the 2nd. Suturiform articulation narrow 

 indistinct, striated ; the furrow on the base of the 4th. segment 

 is wider and more distinct, the striation being also stronger ; it 

 is continued down the sides, (but this part is not striated) obli- 

 quely at the base, more curved at the apex, to near the apical 

 fourth of the segment. The abdomen is long ( and narrow, 

 more than twice the length of the thorax, of equal width through- 

 out. Antennae longer than the body. 



Iphiaulax leptogaster, sp. no v. 



Black ; head, thorax, except the metanotum and the 4 

 front legs, red; wings fuscous-violaceous, the nervures and 

 stigma black ; the basal 2 segments of the abdomen twice longer 

 than broad of equal length and longer than any of the others ; 

 the 1st. irregularly rugose ; the aiea on the 2nd. an equilateral 

 triangle, its base the width of the segment, its apex ending in a 

 keel which reaches to the middle of the segment ; it is stoutly 

 irregularly striated ; from either side of the base a keel runs 

 obliquely to near the apex ; inside it are some broken irregular 

 keels, mostly oblique; outside it particularly on the base and 

 apex, are some irregular broken keels ; the 3rd, segment bears 

 short stout broken keels to near the apex ; the 4th. and 5th. to 

 shortly beyond the middle, the reticulated part being narrowed 

 and rounded at the apex, 



Metanotum and basal segments of abdomen sparsely covered 

 with long blackish hair ; antennae longer than the body ; the 

 scape about 3 times longer than wide ; temples rounded, not ob- . 

 liquely narrowed ; legs densely pilose ; abdomen narrow, twice 

 the length of the head and thorax united. Parapsidal furrows 

 indistinct. Length 13 mm. $ . 



Characteristic of this species is the long narrow abdomen : 

 with the large triangular plate on the base of the 2nd. segment 

 and the irregularly reticulated segments. 



R. A. Soc, No. 4fc, 1904. 



