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SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 37 



have an omnivorous regimen with carnivorous predominance ; the 

 larva of Ps. hehlingi Fittkau (1954), which does not differ from Ps. 

 branickii Now. and Ps. nivosa Goetgh., according to Fittkau (p. 93), 

 shows nothing remarkable in its buccal structures. One could not, 

 without invoking an interpretation, recognize in these structures a 

 correlation with the alimentary regimen. 



MabMd MadMd n /f 

 MLac/ Lac 



/I / / 



Fig. 5. — Protanypus morio Zett. 



Partial view of the anterior ventral region of the head, a, two labral scales ; 

 b, some epipharyngeal elements ; c, d, some premental elements. The prementum 

 (before the hypochilum) shows its dififerent typical processes, the left part 

 being the more ventral. Cf. fig. 15 of Gouin (1957) and figs, i and 3 of this 

 paper. After two preparations furnished by Prof. Hfabe (Brno) e coll. Zavfel. 

 The cranium of these is broken along the line marked with plus marks ( + + + )• 



On the contrary they are much more distinct in the diamesan larva 

 Protanypus morio Zett. (fig. 5), of which Zavfel (1926, p. 208 sq.) 

 has already sketched the anatomy (cf. Goetghebuer 1932, p. 166). 

 Being a form of lake benthose, it feeds on living prey, and in the 

 intestine one finds remains of ingested Chironomidae larvae and 

 pupae (cf. Thienemann, 1954, p. 57). The fundamental structure 

 is indeed orthocladian, but presents an ensemble of remarkable modi- 



I 



