82 



Annals Entomological Society of America [Vol. XII, 



THr 



51 



Figs. 51 and 52. — Longitudinal sections, showing internal anatomy of maxillary 



(. ^ palpus. Fig. 51 shows sensory fibers (SF) running to 3 of hairs {THr) at tip 



of palpus of Ceratomja calalpcB, X 500. Fig. 52 shows how well palpus is 



innervated; semidiagrammatic, X 190. Sense cells (5Ci), connected with 



hairs {THr); sense cells (5C), connected with pores; maxillar}^ pore/ {Mxf); 



E^ and nerve {N). 



f<. I The terminal segment of the maxillary palpus ends bluntly 

 (Fig. 53) and the tip is provided with 8 or 9 minute pseudo- 

 hairs (Figs. 51 and 52, THr), each of which seems to be inner- 

 vated by a single sense cell {SCi) . These sense cells lie in a group 

 at the proximal end of the segment near another group of sense 

 cells {SC) which evidently belong to the pores. Figures 52 and 

 53^show how. well the maxillary palpus is innervated; a portion 

 of the terminal segment in Figure 53 is shown in perspective. 



Mxf 



THr 



53 



Fig. 53. — Schematic drawing of maxillary palpus of tomato worm, showing innerva- 

 tion of maxillary pores/ to / {Mxf to j) and tactile hairs {THr); a portion of 

 terminal segment is in perspective. 



