DIVIDED BYES OF CERTAIN INSECTS 479 



analin. Depigmentation was done with absolute alcohol and C. P. nitric acid, 

 equal parts, mixed. Killing of live material was done with best results in hot 

 Gilson's fluid. The drawings were outlined with a camera lucida. 

 Abbreviations not found in the following list are explained in the text itself. 

 c. Corneal lens (cornea). 

 en. Cone-cell nucleus. 

 tr. Trachea. 

 Bm. Basement membrane. 

 rn. Retinular nucleus. 

 nsp. Nuclei of secondary iris pigment cells. 

 sip. Secondary iris pigment cell. 

 Ifa. Large facetted area (dorsal eye). 

 sfa. Small facetted area. 

 tp. Tapetum. 

 opg. Optic ganglion. 

 cip. Chief iris pigment cell. 

 up. Dorsal part of the head. 

 rb. Rhabdome (rhabdomere). 

 sn. Semper's nuclei in hypodermis. 

 co. Cone or pseudocode. 

 nf. Nerve fibers leading from retinula. 

 Its. 1 lypodermal space. 

 dm. Distal retinula nuclei. 

 prn. Proximal retinula nuclei. 

 rs. Connecting retinular strand. 

 h. Tactile hair. 

 ce. (Esophagus. 



tb. Turban or dorsal large facetted eye. 

 la. Lateral pigmented eye. 



/Is. Transparent liquid space around the connecting strands. 

 drb. Rhabdome of the distal retinula. 



