COLLECTED IN BORNEO, ETC. 129 



deeply punctured, the abdomen more finely so ; one or two of the 

 basal joints of the flagellum green above; the region of the ocell 

 blue. Thorax : a transverse blue line in the middle of the prothorax 

 the mesothorax with an oblong-quadrate blue shape in the middle 

 the wings subhyaUne vv^ith the nervures brown. The abdomen with a 

 central longitudinal smooth line ; the middle of the abdomen tinged 

 with rich blue ; the apex distinctly tridentate. 



The valuable collection of Hymenoptera which I have described, 

 and, by permission of the Society, have had the pleasure of laying 

 before them, is the property of W. "W. Saunders, Esq., I'ellow of 

 the Society, and is the most complete collection formed by Mr. 

 "Wallace. In addition to the interest attached to the description 

 of new species, I have endeavoured to show the extent of the 

 known geographical range of those already described. Of the 

 family Apidce, forty-one species are enumerated, twenty-six of 

 which are new. It is, however, to the JFormicidcB that the most 

 valuable additions are made : of the eighty-five species collected, 

 only seven have been previously described ; ten are added to the 

 MutilUdce, forty-one to the Fossorial group, and thirteen to the 

 family Vespidce, This enumeration will serve to give some idea of 

 the valuable additions to science, resulting from the labours of 

 Mr. Wallace, in collecting tbe insects of the Eastern Archipelago. 



Descbiption of the Plates. 



Tab. I. 



Fig. 



1. Tongue of Pfcnoplecfra chalybea. 1 a, labial palpi; 1 b, paraglossae; 



1 c, labium. 



2. The maxilla of Ptenoplectra chalybea. 2 a, maxillary palpus. 



3. The posterior leg of Ptenoplectra. 



4. Calcar or spur on the posterior tibia of Ptenoplectra. 



5. Anterior wing of Ptenoplectra. 



6. Myrmica longipes, ^ . 



7. I'he labial palpi of Polyrhachis. 



8. Maxillary palpi of Polyrhachis. 



9. Thorax and abdomen of Polyrhachis bihamafa. 



10. Labial palpi of Heptacondylus. 11. Maxillary palpi of the same. 



12. Wing of the same. 13. Profile of the same. 14. Antennae of 



the same. 

 15. Profile of Physatta. 16. Labial palpi of the same. 1/. Maxillary 



palpi of the same. 18. Wing of the same. 19. Antennae of the 



