220 ADDENDA. 



dentally. " Abdomen sessile mucronatum" is an 

 excellent chai'acter, and in my idea distinguishes 

 the genuine from the illegitimate Sirices. Other 

 characters constantly distinguish this genus, some of 

 the most prominent are the following : the tarsi 

 are remarkably elongate; the truncus is retuse at 

 each end, so as to receive both the head and abdo- 

 men ; when these sit close to it, the body looks as 

 if it was formed of one piece; the body is cylindri- 

 cal, and in the male everywhere of equal diameter, 

 or filiform ; in the females, at the insertion of the 

 aculeus, the venter swells into an obtuse angle. In 

 common with Tenthredo, with which it has con- 

 siderable affinity, this genus, upon each side of the 

 metathorax, has what Linneus terms " Granumj* 

 or a small white spot. In some species the apex of 

 each tibia is armed with a single spine, for instance^ 

 S. Columha, &c. while in ^S*. Juvencus, and others, 

 the posterior are armed with two. 



EVANIA. Upon comparing E. a.ppendigaster 

 with E. maculata, Fab. I am inclined to think that 

 it is a good genus. I suspect that more species 

 than one are confounded under the name of -^. 

 appendigaster. That figured by Panzer (c), with 

 yellow antennae, and brown feet and abdomen, 

 seems quite distinct from those I have seen, in 

 which these are all black. 



AMMOPHILA. The Fabrician character of 

 Sphex seems designed for those insects that I have 



(c) Fn. Ins. Germ. Init, n. 68. tab. 12. 



called 



