THE 



BRITISH NATURALIST. 



NEW SERIES* 



SOME CURIOUS AQUATIC LARVAE. 



BY GEORGE SWAINSON, F.L.S. 



The ordinary entomologist is sometimes charged with being nothing 

 but a collector of moths and beetles, etc., and with taking little or no 

 interest in the life histories of his specimens. We know how untrue this 

 is as regards the working naturalist, who studies the feeding and vagaries 

 of his pet insects most assiduously. When we think, however, of the 

 large number of dipterous and other insects which fill our museum 

 cabinets, and whose larvae are still unknown, it is to be hoped our 



a. Cephalic or brain ganglia 



c. Saw-like organ. 



e. Long oar-like appendages. 



/. Lateral plume or swimming fan 



e. Long oar-like appendages. 



g. Air sacs. 



m. Air trumpets to tracheae. 



n. Tail plates. 



Fig. 5. 



a. Cephalic, or nerve ganglia. 



b. Compound eye, 



c. Saw-like organ. 



d. Labial bristles. 



Explanation of Plate V. Corethra Plumicornxs. 

 Fig. i. — The larva. 



g. Air sacs. 



k. Plate-like jaws or mandibles. 

 x. Dorsal vessel or heart. 



Fig 2. — Larva, dorsal view. 



Swimming fan. 

 x» Dorsal vessel. 

 Fig. 3. — Lateral view of pupa. 

 Fig. 4. — Dorsal view of pupa. 



p. Tubules adjacent to cephalothorax. 



-Enlgarged drawing of head. (Fig. 1). 



e. Oar-like appendages orantennai. 

 j. Prehensile organ. 

 k. Tooth plate-like jaws or mandibles. 



