THE BEDBUG AND OTHER BLOODSUCKING BUGS 397 



Fig. 76. — Bedbug: Adult before engorgement. Much enlarged. (Marlatt.) 



Fig. 77. — Bedbug, Cimex lectidariun: a. Adult female, engorged with blood; h, same from 

 below; c, rudimentary wing pad; d, mouth parts, a. b. Aluch enlarged; v, <], highly 

 magnified. (Marlatt.) 



(All from U. S. Dept. Agr. Farmers' Bull. 754., figs. 3, 4, 5, 1.) 



trophonucleus, and possesses a long flagellum consisting of a number 

 of filaments adhering closely together, inserted into a pale area near the 

 kinetonucleus. These parasites may divide into two equal flagellate forms 

 and apparently ma}' go on dividing for some time. Instead of proceeding 

 directly to flagellation, the parasite may show a division of its nuclei into 

 two, with the formation of two flagella, and then division into two 

 flagellate parasites, or the nuclei may multiply without division of the 

 cytoplasm, so that forms containing four to eight nuclei may be to- 

 gether, which eventually break up into separate flagellate forms. If the 

 bug feeds on blood before the development is completed, the flagellates 

 are destroyed. Development is completed in ten to twelve days after a 

 single feed. 



Cornwall and La Frenais describe a thick-tailed form in the bug 

 after the 20th day. Cornwall and ]\Ienon state that the flagellate form 



