86 c t^aitaaian Arctic Expedition, 1913-18 



EXPLANATION OF PLATE VII. 



Simulium, sp. 4, maxilla of larva. 



Same, labium of larva. 



Same, mandible of larva. 



Simulium, sp. 2, thoracic respiratory organ of pupa, 



Psilotanypus, sp.? caudal fin of pupa. 



Rhamphomyia erinacioides, apex of abdomen of male, lateral view. 



Simulium, sp. 4, antenna of larva. 



Dolichopus dasyops, antenna of male. 



Same, hypopygial lamella of male. 



Psilotanypus, sp.? thoracic respiratory organ of pupa, front view. 



Same, lateral view. 



Simulium, sp. 4, thoracic respiratory organ of pupa. 



Simulium, sp. 3, same as above. 



EXPLANATION OF PLATE VIII. 



Oedamagena tarandi, anal spiracles of larva, one outlined only. 



Euphorocera gelida, spiracles of puparium. 



Cephenomyia sp.? cephalopharyngeal skeleton of larva, dorsal view of one-half. 



Oedamagena tarandi, larva, dorsal view. 



Cephenomyia sp.? caudal end of larva. 



Phormia ccerulea, lateral view of head of male. 



Leptocera transversalis, wing. 



Peleteria arctica, head of female, lateral view. 



EXPLANATION OF PLATE IX. 



Mydoeina obscura, puparium, lateral view. 

 Same, anal spiracles. 



Same, cephalopharyngeal skeleton of larva, lateral view; 

 Same, apical segment of larva, dorsal view. 

 Same, antepenultimate segment of larva, lateral view. 

 Aricia borealis, posterior tibia of male, lateral view. 

 Mydmina obscura, head of male, lateral view. 

 Same, fifth sternite of male, ventral view. 



Pogonomyioides atrata, posterior portion of cephalopharyngeal skeleton of larva, 

 lateral view. 

 " 31. iWj/diEiraa obscwro, apex of male adbomen, lateral view. 



EXPLANATION FOR PLATE X. 



Fig. 32. Alliopsis, sp.? head of female, lateral view. 

 " 33. . Alliopsis obesa, head of male, lateral view. 

 ■' 34. Gonatherus atricornis, head of female, lateral view. 

 " 35. Scatophaga suilla, fifth sternite of male, ventral view. 



35a. Scatophaga lutaria, same as above. 



36. Allomyia unguiculata, apical segments of abdomen of male, ventral view. 

 " 37. Same, antenna, leteral view. 



38. Same, apical segments of abdomen of male, lateral view. 



39. Hylemyia acrostichalis, fifth abdominal sternite of male, ventral view. 

 " 40. Same, hsrpopygium of male, one side, caudal view. 



