I\TTxODUCTORY REMARKS. 45 



are distinguished by a cylindr ideal tongue, and 

 valvules rounded or obtuse at their tips. Such 

 petiolated Spheces, as 1 look upon to be genuine, 

 have a tongue similar to the former of these /cA- 

 neumons, and the second joint of their exterior palpi 

 is also rather trapeziform (A), but their economy, 

 antennae, general form, and habit, are very different. 

 Chalcis, which, as well as Leucospis, is distinguished 

 by incrassated posterior thighs, should, in my 

 opinion, follow the Ichneumones Minuti, and be 

 followed by Leucospis. I have not, however, by 

 any means wholly made up my mind upon the 

 natural juxta-position of the genera in this class, 

 and therefore I shall not further commit myself 

 upon that subject. Pompilus, by which I under- 

 stand Sphex viatica of Linneus and its genuine 

 congeners, is not only distinguished by a trifid 

 tongue, with a hairy spot on each of its lateral 

 lobes (/), but its antennae also are revolute and 

 setaceous, and its eyes lateral and oval. Crahro 

 has a prismatical head, with large ovate or subtri- 

 angular eyes which almost meet above the mouth (^), 

 with reticulations visible to the naked eye; its nose 

 is usually covered with golden or silver pile: just 

 above this the antennae are inserted, so as to be 

 properly defined by the term anteriores or anticce, 

 Philanthus, of Panzer at least, is remarkable, not 

 only for its bifid tongue with lateral hairy eleva- 



(h) Tab. 14. N'^S. (i) Ibid. N°4. fig. 2. cc. 



(k) DeGeer, torn. 2. P'^2. Tab.25, fig. 11. yy, 



tions, 



