of some Species of Brazilian Ants. 169 



sub-globose ; tlie base of the third segment fuscous, the two 

 apical ones black, or fuscous. 



JVoikcr. — Length 2^ lines. Rufo-testaceous ; the head and 

 tliorax palest; the entire insect is covered with a delicate silky 

 pile, most observable on the abdomen ; the head oblong, the 

 eyes large, occupying a large portion of the sides of the head; 

 the petiole of the abdomen narrowest at the base ; the first seg- 

 ment sub-globose, widest at the apex, this and the following 

 segments slightly fuscous, and sprinkled with a few glittering hairs. 



This sex is very like the P. oculata, of which a figure is given, 

 but the head is proportionably rather narrower ; the prothorax is 

 oval, not widest in front; the petiole is rather shorter, and not 

 so slender at the base. 



Male. — Length 2\ lines. Testaceous ; the antennae and legs 

 pale testaceous; the head scarcely longer than broad; the eyes 

 large, oval and placed at the sides of the head anteriorlj' ; the 

 ocelli large and glassy bright ; the sides of the head rounded 

 behind the eyes; the vertex emarginate. Thorax, the scutellum 

 prominent ; the wings hyaline, and beautifully iridescent, the 

 nervures and stigma pale testaceous ; the abdomen of the same 

 form as that of the worker; the insect thinly covered with fine 

 short silky pubescence. 



Hab. Brazil (Villa Nova, on the Amazons). 



EXPLAXATIOX OF PLATE XIII. 

 Fig. 1. Hciton crassicornis. 5- 



2. Antenna of Eciion irussicornis. 8 ' 



3. Head of Eciton raptor. ^ . 



4. Antenna of Echon raptor. JJ . 



5. Antenna of Eciton curvideiitala. § • 



6. Head of Eciton hamata. § . 



6a, the eyes. 



7. Mentum of Eciton hamata. 



a, the labial palpi. 



8. Maxilla of Eciton hamata. 



a, the lobe of the maxilla ; b, the maxillary palpus. 



9. Pseiidomurma advena. J . 



10. Wing of the female. 



11. Antenna of the same. 



12. Pseudomyrma cephalica. 5 • 



13. Pseudomyrma cephalica. $. 



14. Anterior leg of Pseudomyrma cephalica. 5 . 



15. Abdomen of Pseudomyrma cephalica J in profile. 



16. Antenna of Pseudomyrma cephalica. J . 



17. Head of Pseudomyrma cephalica, J . 



18. Myrmica stEvissima. J • 



19. Nodes of the abdomen of the same in profile. 



