12 



PKOCEEDINGS OF THE NATIONAL. MUSEUM. 



VOL. 60. 



are those of adult ; mentum long triangular, apparently 2-segmented ; 

 with two pairs of thoracic and seven pairs of abdominal spiracles, the 

 former with chitinous bar as in adult, all with one or two pores, the 





FlO. 3. ULTRACOai.OSTOMA ASSIMILB (MASKKLL). A. LARVA, OUTLINE FROM BENEATH, 



X 57.5 ; B. SAME, APEX OF ABDOMEN, X 165 ; C. LARVA, LEG, X 220 ; D. UiRVA, VENTRAL DERM 

 BETWEEN LEGS, X 336, WITH DETAIL OF PORE, X 640 ; B. LARVA, ABDOMINAL SPIRACLB, 

 X600; F. LARVA, THORACIC SPIRACLE, X 500 ; G. INTERMEDIATE STAGE FEMALE, LEG, X 335 ; 

 H. LARVA, ANTENNA, X 220 ; I. INTERMEDIATE STAGE FEMALE, PORTION OF DERM BETWEEN 

 HIND LEGS, XS3B; J. ADULT FEMALE, ANAL TUBE, X 165 ; K. INTERMEDIATE STAGE FEMALE, 

 ANTENNA, X 385 ; L. ADDLT FEMALE, PORTION OF DERM, X 165, WITH DETAIL OF PORE, X 640 ; 

 M. INTERMEDIATE STAGE FEMALE, APEX OF ABDOMEN, X 165 ; N. ADULT FEMAL3, MIDDLB 

 LBG, X440; O. SAME, ANTENNA, X 165 ; P. INTERMEDIATE STAGE FEMALE, THORACIC 

 SPIRACLB, X500; Q. SAME, ABDOMINAL SPIRACLE, X 500 ; R. ADULT FEMALE, ABDOMINAL 

 SPIRACLB, Xl65; S. SAME, THORACIC SPIRACLE, X 165. 



posterior abdominal pair much enlarged and placed close to the open- 

 ing of the anal tube; derm with numerous large circular clear pores, 

 .small circular clear pores, quadri or trilocular center pores, and multi- 



