504 



CAROLINE BURLING THOMPSON 



large compound eyes, and in sections the cell layers and the three 

 fiber masses are plainly seen. The mushroom bodies, though 

 relatively somewhat smaller than in the higher termites, attain 

 their greatest size in the indi^dduals of this caste. The smooth 



Fig. 4 Termopsis angusticollis. A comparison of the brains and compound 

 eyes of the four castes, a, first-form adult; h, second-form adult; c, third-form 

 adult; d, adult soldier, mh, mushroom body; ol, optic lobe; ce, compound eye. 

 Spencer oc. 6. obj . 32 mm., stage level, reduced two-fifths. 



