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SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I37 



moves on the basal one. Reviewing Anthon's paper, Snodgrass 

 (1950, pp. 75-76) rightly claims that "it is impossible to accept 

 Anthon's conclusion," just as I have already rejected Anthon's inter- 

 pretation concerning the larval Chironomidae mandible (Gouin, 1957). 

 According to Snodgrass, it is merely a partial "desclerotization," 

 permitting a weak mobility. 



,MPrm 



f/fomm 



Fig. 14.- — Macropclopia cf. ncbulosa Mg. 



Part of a paramedian sagittal section more lateral than that of figure 15. Inser- 

 tion of the premental muscle (M Prm) ; section of the maxillary lobe (Lac) 

 with the insertion of numerous club-shaped bristles. The mandible (Md) is 

 cut on the extreme tip. The suspensorium (Sp) shows an element of its toothed 

 fringe. Stomodeal circular musculature ; pharyngeal lateral and dorsal dilators. 

 /, intima. 



Whatever it is, such a segmentationlike conformation exists on the 

 mandibles of these larvae; and Schremmer (1951) has also described 

 it in some Brachycera. Besides, the mandible being prehensible, as 

 has been stated (Gouin) in Chironomus and also in forms studied 

 by Anthon (figs. 31, 33), the adductor tendon is inserted on the base 

 of the toothed part. 



