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SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, 1 37 



respects; here we are interested in the mouth parts (fig. 3) which 

 are not finally developed : the maxillary palpus unsegmented, lacinia 

 longitudinally undivided, labial palp without sensory papilla, and the 

 fulcrum only indicated and their rods not coalesced in the middle line 

 (Tuxen, 1949, pp. 33-34)- The accordance with prolarva of Diplura 

 is obvious. 



C-mt-R 



0.05 mm 



Fig. 4. — Campodca plusiochacta Silv. Head with mandibles, dorsal. 

 Mandible doUed. 



Though the morphology of the mouth parts of Diplura has been 

 described several times, I have made the figures 4-7 to form for 

 myself an impression of the conditions. Figures 4 and 5 show the head 

 from above, the mandibles and what is below the mandibles, figure 6 

 the mouth parts ventral, the labium removed, and figure 7 the head 

 in side view — all in the same magnification. I had hoped on the basis 



