LARVAL HEAD OF SOME CIIIRONOMIDAE — GOUIN 



I«I 



Mad Md 



MLac 

 DJK 



NR 

 rMPhd 

 Ph 



Fig. 4. — Prodiamesa olivacca Mg. 



Inferior parts of two successive cross sections (lO/x) concerning the hypochilan 

 region. Conformation of the hypochilum with its base enlarged into a spacious 

 cavity where there are numerous nerve elements. Location of the maxillary 

 (DJMx) and labial (DJLab) imaginal discs. Cf. fig. 2 of this paper and 

 fig. 7 of Gouin (1957). 



The Predaceous Modification of the Orthocladian Structure; 

 Protanypus Morio Zett. 



Some species of Orthocladiinae and of the Diamesa group are pre- 

 daceous or reputed to be so (cf. Thienemann, 1954, p. 57 sq.). Thus 

 the Cardiocladius species are supposed to feed on the Simuhidae 

 larvae among which they live. Cardiocladius sp. and C. ohscurus Joh. 

 (cf. Saunders, 1924) that v^e. have examined present no special 

 characters ; but are not the Simuliidae larvae, the presumed victims 

 of Cardiocladius, fixed upon a support? The Pseudodiamesa larvae 



