ADDENDA. 223 



face : the lip is very minute : the maxillae are bifid 

 at their apex : the eyes are lateral, inclining to an 

 oval figure : the collum is transverse before, and 

 behind subrepand : the thorax is subquadrate : the 

 scutellum, which is as large or larger than the tho- 

 rax, is triangular, and terminates in a second piece 

 besides the metathorax, so that it may be defined 

 by the term duplex : the abdomen is elongato- 

 conic, and the anus is spinose. In habit it ap- 

 proaches Bemhex. 



Thynniis integer varies from the others in the 

 following particulars. The maxillae are entire at 

 their apex : the eyes are rather round : the collum 

 receives the head and thorax into a sinus, which is 

 the segment of a circle : the scutellum is single, 

 (simplex) with a trnncate apex : the abdomen is 

 subulato-conic, and the ventral segment of the anus 

 terminates in a recurve spine. 



DORYLUS. The only species of this gen US' 

 known as yet, is the Mittilla helvola, Lin. which is 

 certainly no Mutilla, and cannot well be arranged 

 under any known genus : Fabricius has therefore, 

 with great propriety, placed it by itself. In my 

 idea it is more nearly related to Formica than Mu- 

 tilla, for its abdomen is connected with the trun- 

 cus by the intervention of a globose petiolus. It is 

 a most singular insect ; the following are its most 

 prominent features. Its maxillae are acute, with- 

 out teeth, forcipate, immensely large: its eyes are 

 hemispherical : its antennae are filiform, inserted in 



the 



