



PSYCHE. 



ORGAN OF THE CAMBRIDGE ENTOMOLOGICAL CLU3 

 EDITED BY B. PICKMAN MANN. 



Vol. L] Cambridge, Mass., September, 1876. [No. 29. 



Anatomy of the Plant-lice. 



A "Contribution to the Anatomy and Histology of the Plant- 

 lice, of the Coccidae in particular, by E. L. Mark," in the 

 Archiv fur mikroskopische Anatomie, Bd. xiii, gives an exposi- 

 tion of the organs concerned in the acquisition and digestion of 

 food, and treats the same under the heads : 



1. Mouth-parts, 



2. Alimentary Canal, and. 



3. Accessory Organs of Alimentary Canal, the latter being 

 the salivary glands and the Malpighian vessels. 



An attempt is made to homologize the elements — to which 

 special names are given — of the chitinous frame-work of the 

 mouth parts in different genera of the Coccidae. 



Observations on the method of extruding the seta?, four in 

 number, which compose the sucking tube, follow. A peculiar 

 sack-like organ, enveloping the extensive loop which the bun- 

 dle of setae often forms within the abdomen, is found to be pres- 

 ent in each of the four groups into which the Coccidae have 

 been divided by Targioni-Tozzetti, although this author denies 

 the existence of such an orrran. The earlier observations of 

 Dujardin are thus in the main corroborated. 



A complicated pumping apparatus is also ascribed to these 

 insects. 



The exceedingly peculiar and interesting relations of the 

 different parts of the intestinal canal, not very successfully 

 explained by Leydig, — whose mistakes Lubbock was hardly 

 more successful in correcting — but much better understood by 



