CHIRONOMUS PRASINUS. 173 



EXPLANATION OF PLATES IX. AND X. 



Plate IX. 

 jTio-. 1. — Larva of Ghironomus ijrasinus, side view : ra, respiratory 

 appendages ; rp, rectal papillae. 

 ,j 2. — Larva, showing, sg, salivary glands, the alimentary canal, and 



transverse muscles, x. 

 ,, 3. — Ditto, showing double ganglionated nerve-cord aild subcu- 

 taneous muscles, m. 

 — Portion of salivary gland, showing simple condition of cells. 



—Alimentary canal : «, oesophagus ; p, proventriculus ; 8, 

 stomach ; mt, malphigian tubes ; si and //, small and large 

 intestine. 



—Heart of Larva, front view. 



—Pupa 



—Portion of salivary gland, showing petiolated cells. 



—Antenna of Larva (bifid extremity only). 



—Perfect insect, male. 



—Ditto, ditto, female. 



—Section of proventriculus, showing the extremity of the 

 oesophagus hanging in tlie cavity, and reflexion of the 

 cuticular lining, c, around it. 



Plate X. 



-Head of Larva, dorsal view : «, antenna ; ??i, mandible. 



-Ditto, ventral view : ?, labium. 



-Portion of small intestine, showing muscular covering. 



-Nuclear cord and nucleoli from cell of salivary gland, after 

 Balbiani. 



-Portion of large intestine, showing epithelium. 



-Filamentous elements in blood. 



-Thickened epithelial cells from stomach. 



-Ditto in groups, with radiating pores. 



-Transverse section of the transverse muscles in abdominal 

 segments. 



-Extremity of a respiratory filament of the pupa. 

 -Portion of somatic rete, with oil-globules. 

 -Hypodermic cells : a, ordinary condition ; 5, amujbiform. 

 -Section of integument, cuticle, and hypoderm. 

 -Short co3cal projections of stomach. 



-Anterior portion of stomach, showing coecal projections 5 

 cc, cuticular lining, enclosing food masa. 



