4 ARKIV FÖR ZOOLOGI. BAND 3. N:0 22. 



they were most abundant and where I coiinted up to one hund- 

 red in a space of about 5 cbdm. 



As before mentioned not only did the termit es not do the 

 larvse any harm, but even seemed to hke their company. The 

 fact that the larvse were always seen acompanied by a few 

 soldiers and workers each can hardly be a mere accident, but 

 seems to me to suggest that the larvse affect the termites in 

 some agreeable way. 



In this connection the fact that the larvae emitted a strong 

 smell derserves to be mentioned and the suggestion immedea- 

 tely presents itself that the abdominal appendages are in some 

 way connected with the smell or otherwise with the termitophi- 

 lous life of the iarvse. 



I therefore cut transversal and sagittal serial sections 

 through the larva, which had been killed according to the me- 

 thod employed by Giles^ viz. by immersion in a solution con- 

 sisting of two parts of alcohol (90 percent) to one part of aque- 

 ous solution of perchloricle of mercury (1 per mille) in a test- 

 tube which was then gently boiled for a minut e or two so a& 

 to expel the air contained within the trachese. This method 

 proved to effect a splendid fixation of the tissues. 



Fig. 6 represents a träns verse section of the body of the 

 larva. The fatbody (f) is very highly developed (compare the 

 figure of transverse sections of Tineidlarvsein Packard') and 

 forms two large, subdorsal cords on each side of, and along the 

 digestive tract. extending through the entire body. *Beside 

 these there are several smaller lobes extending between the 

 hypodermis and the muscular layers on the dorsal, ventral and 

 låter al sides. 



From the sub ventral lobe extends a pro jec tion into the 

 proximal two thirds of the abdominal appendage. The fat- 

 body consists of various larger and smaller cells filled with 

 dröps of fat. The internal fat-body cells are by far larger than 

 those of the subhypodermic lobes. Next to the fatbody the 

 bloodtissue (bl) is most highly developed; it envelopes the fat- 

 body lobes and occurs especially between the dorsal hypodermis 

 and the fatbody and in the abdominal appendages, whose 

 distal thirds are filled exclusively with the blood-tissue. (Vide 

 Fig. 7, which represents a transvere section through this part 



' A handbook of the Gnats or Mosquitos. London 1902. p. 34. 

 - Textbook of Entomolog}-, p. 129. 



