HYMENOPTERA. 161 



Atta armigera, Guer. Icon. Reg. Anim. 421. pi. 69. f . 2 . 

 Daceton armigerum, Perty, Del. An. Art. 136. t. 27. f. 5. 



Smith, Trans. Ent. Soc. new ser. ii. 217 $ ? ? , pi. 21. 

 f.7c?,8?. 

 Brazil (Santarem). (Coll. H. W. Bates.) 



Genus 11. ORECTOGNATHUS. 



Orectognathus, Smith, Trans. Ent. Soc. new ser. ii. 227 (1852- 

 53). 



1. ORECTOGNATHUS ANTENNATUS. 



Orectognathus antennatus, Smith, Trans. Ent. Soc. new ser. ii. 

 228. pi. 21. f. 9. 



Hab. New Zealand. 



Subfam. 3. ATTID^E. 



The number of joints in the maxillary palpi varying from 4 to 



2, those of the labial palpi from 3 to 2 ; the ocelli usually obso- 

 lete in the workers, some species of the large workers furnished 

 with a single ocellus ; the petiole of the abdomen formed of two 

 nodes, females and workers having a sting. The colonies of the 

 different genera and species consisting of males, females, large 

 and small workers ; the large workers with enormously enlarged 

 heads, those of the small workers of the ordinary size. 



Genus 1. ATTA. 



Formica, pt., Linn. Syst. Nat. i. 962 (1/66). 

 Atta, St. Farg. Hym. i. 1/3 (nee Fabr.) (1836). 

 Myrmica, pt., Nyl. Form. Fr. et d'Alger. 83 (1856). 

 Aphenogaster, Mayr. Form. Austr. 194 (1855). 



Maxillary palpi 4-jointed, labial palpi 3-jointed ; antennae 12- 

 jointed in the female and worker, 13-jointed in the male. Wings 

 longer than the body, with one marginal and three submarginal 

 cells, the third sometimes incomplete ; the second submarginal 

 cell bell- shaped, the nervure at its apex uniting with that at the 

 base of the marginal cell. Abdomen with two nodes in the pe- 

 tiole ; the large workers usually with enormously developed heads, 

 the small workers with heads of the ordinary size. PI. IX. fig. 24, 



It is very probable, that were the palpi of all the species in- 

 cluded in this catalogue examined, they would not agree in the 

 number of joints given in the generic characters of Atta, and at 

 a future time it may be necessary to remove some into the genus 

 Solenopsis, or to establish new genera for their reception ; it will 



