5 



CHIRONOMUS 5 [LAUTERBORN'S fig. 10 and fig. I3(?)]. 

 LARVA : length 2 cm. ; red blood ; antennas very long with open bow-nets on long 



arms; dorsal hump on segment n ; last three segments flattened ; head partly 



retractile. 



LARVAL DWELLING : perpendicular mud tubes, 10 cm. long. 



PUPA : i cm. long, dark brown ; respiratory cones covered with long transparent hairs. 

 PUPAL DWELLING : same as larva. 

 HABITAT : marshes and slow streams. 



CHIRONOMUS 6. 



LARVA : length 2 cm., red blood ; antennas very long, spear-shaped. 

 LARVAL DWELLING : tough mud case 5 cm. long. 



II. LARVJE WITH BRISTLES ON THE STRIATED FLAP. 



CHIRONOMUS 7. 



LARVA : length 2 cm. ; colour dirty white ; head chitinous ; about 23 bristles on the 



striated flap ; trachea; from head to anal gills. 

 LARVAL DWELLING : loose earthy tube among mud and sticks. 

 PUPA : length i'i cm. ; respiratory cones broad, blunt-pointed, spinous ; last segment 



very small ; anal swimming plates united ; large tail fin. 

 HABITAT : ponds and streams, on sticks or in mud. 



CHIRONOMUS 8. 



LARVA : length i cm. (?) ; a few bristles on the exterior part of the striated flap ; 



trachea? from head to last segment imbedded in pink tissue ; claws of anal 



feet completely retractile ; anal sense organ three setae. 

 HABITAT : peaty bogs and pools. 



III. OTHER LARVAE. 



CHIRONOMUS 9. 



LARVA : length 2 cm. : red blood : long coiled ventral blood gills on segment 1 1 ; small 



backwardly projecting gills on segment 10 ; tracheae on segments i and 2, 

 LARVAL DWELLING : oval mud case in muddy streams. 



C. NIVEIPENNIS. 



LARVA : red blood ; no ventral blood gills. 



LARVAL DWELLING : mud tube. 



PUPA : tracheal gills with only a few secondary branches ; tail-fin 30-40 long setas ; 



second abdominal segment with paired postero-lateral transparent appendages ; 



pair of long seta; on conical prominence on vertex of head. 



