184 A NATURALIST IN BORNEO 



structure for the accommodation of what appear to be 

 mere parasites is very remarkable, but it is not without 

 parallel in the insect kingdom. 1 Another case may be 

 mentioned here. The Anthribidce, like their allies the 

 Brenthidce, are also much infested with mites, and one 

 species has a deep crescentic slit in the prothorax 

 which is filled with the parasites. 



1 The following exceedingly interesting examples are described 

 by Dr. R. C. L. Perkins in The Entomologist's Monthly Magazine, 

 XXXV. (1899), pp. 37-9. The female bees of many species of the 

 genus Koptorthosoma (Xylocopince) possess, in the basal abdominal 

 segment, a special chamber which always contains, and sometimes 

 is entirely filled by, Acari of large size. Somewhat similar ac- 

 commodation for minute Acari is provided by a female wasp of the 

 genus Odynerus from Arizona and Mexico. E. B. P. 



