56 



b'. Head either punctured or smooth and 



shining, never striate. 

 a 2 . Basal abdominal segment punctured. 

 a 3 . Length 4-6 mm. 



a*. Of very slender form ; meso-meta- 

 notal suture above broad and 

 distinct .................... L. hystericn, p. 64. 



b 4 . More robust ; meso-metanotal su- 



ture above obsolete .......... L. punctiventris, p. 64. 



b 3 . Length over 9 mm. .............. L. binghami. p. 66. 



b 2 . Basal abdominal segment not punc- 



tured, smooth. 

 a 3 . Node of pedicel short, broader than 



long or about as broad as long. 

 a*. Head smooth, shining, not punc- 



tured. 



a 5 . Seen from above node of pe- 

 dicel considerably more than 

 half the length of 1st abdo- 

 minal segment ............ L. emilia, p. 66. 



b s . Seen from above node of pe- 

 dicel distinctly very much less 

 than half the length of 1st 

 abdominal segment ........ L. lucidula, p. 66. 



b 4 . Head punctured. 



a 5 . Mandibles toothed on inner 



margin. 



c . Head and thorax opaque, 

 with a blue metallic tint in 

 certain lights ............ L. molten, p. 67. 



b'\ Head and thorax sparsely 

 punctured, shining, not 

 opaque, and with no metal- 

 lic tint ................ L. dalyi, p. 67. 



b 3 . Mandibles toothed at the apex 



only. 

 a. Meso-metanotal suture above 



obsolete. 

 a 7 . Abdomen lighter in colour 



than head and thorax . . L. roberti, p. 68. 

 W. Abdomen concolorous with 



head and thorax ...... L. coonoorensis, p. 68. 



b 6 . Meso-metanotal suture dis- 



tinct .................... L. yerburyi, p. 69. 



b 3 . Node of the pedicel elongate, with 

 a sloping curve from back to front, 

 vertically truncate posteriorly. 

 4 . Head, thorax and abdomen with 



a bluish metallic reflection. 

 a 3 . Apex of median lobe of clypeus 

 transversely truncate, some- 

 times bidentate ............ L. chinensis, p. 69. 



b 5 . Apex of median lobe of clypeus 

 ending in a blunt obtusely 

 rounded point, not transversely 

 truncate .................. L. minchini, p. 70. 



