PLATE LIV 



the wall 



Figure 1. The head of Echidnophaga gallinaceus. X 130. 

 Figure 2. The hind coxa of Pulex irritans, to show the spines on 



the inner side. 

 Figure 3. The end of the manubrium of Ctenocephalus cams. 



Compare with that of Ctenocephalus felis on the 



previous plate. 



Figure 4. The maxilla of Ctenocephalus felis. 

 Figure 5. The head of Ctenocephalus felis, ? , after Rothschild. 



Compare with figure 13 below. 

 Figure 6. The labium (rostrum) of Ctenocephalus felis. The 



large undivided plate corresponds to the mentum, the 



smaller one posterior to it to the submentum. X 220. 

 Figure 7. The distal end of the mandible of Ct. felis, to show the 



teeth. Very highly magnified. 

 Figure 8. The mandible of Ct. felis, showing the basal segment 



and its articulation to the wall of the head cavity in 



the region of the genal comb. A part of the wall 



with one spine is shown, broken off. x 190. 

 Figure 9. The distal end of the labrum-epipharynx of Ct, felis. 



x 1000. 

 Figure 10. One of the sense hairs of the antenna of Ceratophyllus 



fasciatus, very highly magnified. See figure 12, 



where they are darkly shaded. 

 Figure 11. The labrum-epipharynx of Ct. felis, dissected out with 



its attachments. The salivary receptacle is situated 



in v. w. X 190. 

 Figure 12. The antenna of Ceratophyllus fasciatus. It is 



completely segmented. Compare that of Ct. felis on 



previous plate. 

 Figure 13. The head of Ctenocephalus canis, ? , after Rothschild. 



Compare with figure 5 above. 



