196 SPHEGIDJE. 



Head very little wider than the thorax ; mandibles emar- 

 ginate near the middle of the outer margin, apes of the mandibles 

 simple, not dentate ; eyes slightly convergent towards the vertex ; 

 ocelli irregular, the anterior being normal, the posterior two 



more or less ill-formed or obsolete ; 



pronotum transverse posteriorly, not, 



or scarcely at all, depressed below the 



level of the mesonotum ; fore wing with 



one radial and three cubital cells, the 



radial cell appendiculated ; the first 



cubital cell equal in length to the 2nd 



and 3rd united ; the 2nd and 3rd 



much narrowed above towards the 



radial cell ; 2nd often almost trian- 



Pig. 44, cmlar : the 3rd elongate, rather tongue- 



Larra carbonaria, V • !• i i i i. ^ i *. l ^i, 



^ shaped ; legs short and stout, the 



intermediate tibiae with one spur, the claws not particularly 

 slender or long ; abdomen with the 2nd ventral segment normal, 

 not convexly raised in the middle ; the pygidial area well-marked, 

 bare, without pubescence, punctured. 



Key to the Species. 



A. Abdomen more or less red. 



a. Front of head with a prominent raised 



transverse margin or ridge L. fitscipennis, p. 197. 



b. Front sulcate without any transverse 



margin. 



a. Median segment very finely and densely 

 punctm-ed, the punctm-es running into 

 striae : j)Osteiior wing clear hyaline 

 along its posterior margin L. sumatrana, p. 198. 



v. Median segment not so densely punc- 

 tured ; posterior margin of hind wing 

 fuscous L. simillima, p. 199. 



B. Abdomen entirely black. 



a. Median segment coarsely reticulate. 



a'. Of small size (L. 7 mm.) L. tisijjhone,^ p. 198. 



b'. Of nmch larger size (L. 22 mm.) .... L. carbonaria, p. 198. 



b. Median segment punctured or striate. 

 a' , Legs more or less red. 



a^. Posterior femora only red. 



a^. Median segment closely and finely 

 punctured, the punctures running 

 into strife above ; hind wing 

 much lighter in colour than fore 



wing L. erratica, p. 199. 



¥. Median segment not so finely punc- 

 tured, narrowly reticulate along 



base L. matira, p. 199. 



b"^. All the femora, tibiae, and tarsi of 



legs red L. riifipes, p. 200, 



