xxx j v ANALYTICAL TABLE. 



PAGE 



A. Metathorax slightly prolonged under thej>ost- 

 scutel beyond it, being truncate before ; 

 its concavity margined with sbarp edges, 

 nearly angulate on each side 

 Abdomen slender, cylindrical; first seg- 

 ment as wide as the second. Body vel- 



vety 



313 



B. Metathorax scarcely, or not distinctly pro- 

 duced under the post-scntel, beyond it . 

 Abdomen elongate, cylindrical, with ihe 1st 

 segment as wide as the 2d, elongate; or 

 ovoid-elongate with the 1st segment a 

 little narrower, rounded . . . 313 



* The 1st and 2d abdominal segments each 

 adorned with two yellow spots, or 

 fascia? beside their marginal fascia . 313 

 ** Only the second abdominal segment 

 adorned with two yellow spots which 

 are i fteu wanting, principally in the 

 males ....... 321 



*** No free yellow spots on the first two 



abdominal segments . . . 327 



. Form less cylindrical, not much elongated, the 

 thorax often short, and wide anteriorly, 

 contracted posteriorly. Metathorax more 

 convex, rounded; its fossette generally 

 small, but always distinct. Abdomen ovoid 

 or irregular, the first segment narrower than 

 the Second, not truncate anteriorly, not as 

 ses.-ile; second segment more swelled than 

 in the preceding, sliort and convex, con- 

 tract"'] at base to fit into the first . . 332 

 A. Form rather stouter, abdomen rather wide in 

 the middle, but yet attenuated hefore. 

 The fossette of the posterior face of meta- 

 thorax rounded, always distinct . . 333 



a. Thorax but slightly adorned with yellow; 



(sometimes quite black, with a yellow 

 spot under the wing) ; post-scntel quite 

 Mack or adorned with two yellow dots . 333 



b. Anterior martin of prothorax adorned with 



yellow, but not the posterior margin : 

 the yellow fascia of' en bilobed or inter- 

 rupt.'.!. Fossette of metathorax large, 

 rather triangular, occupying nearly the 

 whole width of the metathorax . . 334 



