49 



* 



APPENDIX. 



List of larvae and pupae mentioned in the text. 

 I. INSECTS WHICH, IN THE LARVAL STAGE, HAVE BIFURCATING HAIRS 



ON SEGMENTS 5-9, i.e., THE " PUSIO " GROUP. 



CHIRONOMUS PUSIO, THE TYPE. 



LARVA : length=4 mm. ; antennae long, with minute bulbs ; tracheae in segments I 



and 2 and 10-12 ; fat-sacs in segment to. 

 LARVAL DWELLING ; 5- to 7-armed mud tube. 

 PUPA : length 3 mm. ; respiratory cones usually projecting forward, converging, spinous ; 



large tail fin. 



PUPAL DWELLING : mud tube, circular operculum of mud with central pore. 

 HABITAT : moorland streams. 



CHIRONOMUS 1 (stalk-cased larva, LAUTERBORN'S FIG. 14). 



LARVA : differs from the type in being slightly smaller and more hairy. 



LARVAL HABITAT : a 3-armed stalked case of mud. 



PUPA : respiratory cones bent at right angles (elbowed). 



PUPAL DWELLING : stalked case covered in by transparent operculum with large central 



pore. 

 HABITAT : moorland streams and brooks. 



CHIRONOMUS 2 (LAUTERBORN'S Larva 3). 



LARVA : antennas arising from projecting bosses. 



LARVAL DWELLING : a reed-like case, smaller behind, truncated at both ends, covered 

 with rhizopod scales, length 3-5 mm. 



CHIRONOMUS 3. 



LARVA : antennae longer than in type ; hairs on first four segments. 

 LARVAL DWELLING : similar to type but without arms. 

 HABITAT : similar to type. 



CHIRONOMUS 4. 

 LARVA : antenme very large, closed bow-nets ; head partly retractile ; anal hairs as long 



as the anal setae. 



LARVAL DWELLING : indefinitely long, winding, mud tube. 

 HABITAT : clear p.oncls. 



