(5 ARKIV FÖR ZOOLOGI. BAND 3. N:0 22. 



be considered an indirect exudatory tissue. Both the blood- 

 tissue and the fat-body are highly developed or even hyper- 

 trophied and the cuticle especially of the abdomen is very thm 

 and membranaceous. With regard to the distribution of the 

 respective tissues there exists a perfect analogy to the Tineid- 

 larva, the cords of the fat-body being surrounded by large 

 layers of blood-tissue which separate them from the hypo- 

 dermis. 



Above all the so-called »Exudat-knospen » of Xenogaster 

 present a great resemblance to the appendages of the larva. 

 (Compare Fig. 6 with Fig. 24 op. cit.). By Xenogaster the 

 hypodermis is retracted from the cuticle and forms a »basal- 

 septum» which Wasmann supposes to act as a filter through 

 which some fluid fram the blood-tissue passes out. 



Also by the Tineid-larva the hypodermis is, although in a 

 smaller degree, retracted from the cuticle and this can hardly 

 be caused by the fixation, as it is to be observed only in the 

 appendages, not in the body. The only difference between 

 Xenogaster and the larva consists in the appendages not being 

 perforate while the »Exudat-knospen» possess small pores. 

 But as a substitute for these the exceedingly fine hairs with 

 their ducts, which occur on the appendages very likely serve. 



The conclusion to be drawn from the above stated facts 

 seems to me to be, that the lateral abdominal appendages of 

 the Tineid larva act as an exsudation organ, which renders the 

 larva agreeable to the termite. As the larva emits a strong 

 odör, and the termites were scarcely seen touching the appen- 

 dages the exudation is very likely an alluring odör. As appen- 

 dages, which appear to be homologues, occur in other lepidop- 

 terous larvee, where their function, when kno\\Ti, is stated to 

 be of defensive nature, it is not probable, that the Tineid larva 

 has acquired them independently as an adaption to its termi- 

 tophilous life but only developed them more highly from a 

 common origin and changed their function from being repelling 

 to being alluring organs. 



As far as I am aware exudatory organs have hitherto ovly 

 been found amongst the true inmates or symphilous insects of 

 the termites, and it is thus interesting to find that they also 

 occur amongst the »synoeki». 



