252 ENTOMOLOGISK TIDSKRIFT IQ I 7. 



genus Scûlopendrella the calicles are regularly shaped, the 

 opening is very large though scarcely as wide as the calicle, 

 and the margin is naked. In Sc2itigerella the calicles are 

 very irregular, the anterior and lateral parts of the wall be- 

 ing vertical and its posterior part very oblique, besides a 

 large portion of the margin has numerous hairs (comp, my 

 monograph in Quart. Journ. Micr. Sc. Vol. 47, 1904). 



The trichobothria in the two orders of Myriopoda differ 

 from those in the Arachnida in being inserted on the body, 

 besides they are proportionately longer and stronger with 

 the basal part within the culicle strongly swollen, and the 

 opening of the calicle at most a little narrowed, sometimes 

 (in Saitigerella) very wide. 



IV. Insecta, 



Especially in a paper published in 1905 (Zool, Jahrb. 

 Suppl. VI) F. SlLVESTRI has mentioned sensory hairs on 

 some joints of the antennae in Japyx, Cainpodca and Eiitrkho- 

 canipa, and nearly similar hairs on the cerci of forms be- 

 longing to the family Lepismatidas. He named this kind of 

 hairs on the antennae »sensilli uditivi», auditory hairs, and 

 those on the cerci only »sensilli». I had discovered these 

 sensory hairs respectively on the antennae and the cerci in 

 representatives of the families in question before SlLVESTRI 

 had published anything on the matter, but I never wrote 

 about it before now. SlLVESTRI said on these hairs in the 

 antennae of Cainpodca: »lO sensilli uditivi costituti da una 

 fossetta circolare dal fondo della quale sorge una lunga e 

 sottilissima setola», and he found them on third to sixth 

 article. These hairs are therefore real trichobothria, but 

 SlLVESTRI does not seem to have known that such hairs 

 long time before had been found in Arachnida. The sen- 

 sory hairs on the cerci in Lepismatidae are also trichobothria 

 and in the main similar to those on the antenna;, though 

 their calicles are perhaps somewhat smaller; SlLVESTRI named 

 them »sensilli», without supposing them to be auditory 

 organs, but if the trichobothria on the antennœ of the 



