Vol. xxiii] ENTOMOLOGICAL NEWS. 341 



feeding continued till io.il p. m. (stopped by force). Placed on food 

 again at 8.36 p. m., April 2nd, the nymph pale; first blood entered after 

 i minute and feeding continued till 9.15 p. m. ; excrement voided as 

 usual but in larger amounts. Nymph was dead by 5 p. m., April 5th, 

 without change, having been left without food. 



Nymph II. 



Hatched 3oth March, 1910. Placed at 8.48 p. m. on skin of arm; 

 did not crawl at all but at once took feeding position and attempted 

 to feed. Unsuccessful until after 4 minutes when first blood entered 

 the body; fully colored after 1^2 minutes of feeding; the entire abdo- 

 men and thorax a deep crimson ; excrement gradually forced from 

 anus. Fed for 14 minutes. Then removed to vial onto piece of cheese 

 cloth. 



By noon March 31 st, the young nymph was again shrunken about 

 the abdomen, merely the alimentary canal and sides of thorax being 

 still crimson. Placed on hairless portion of arm, at 1.48 p. m., 3lst; 

 blood began to pulsate after i l / 2 minutes, the pulsations at the rate of 

 about 3 per second. As the abdomen became inflated, a long, dry 

 string of minute blood-red pellets were forced from the anus; this 

 was moniliform nearly and brilliant ruby red. At 1.59 p. m. stop- 

 ped feeding and commenced to crawl slowly off. Alimentary canal 

 stained ruby red, the remainder of abdomen pinkish. Nymph would 

 not voluntarily go to food at 8 p. m., 3ist March but crawled away 

 from it (under bright light 16 c. p.). 



In bright daylight, the nymph pallid excepting dark alimentary 

 canal, it went to food at once at 1.24 p. m., April 1st; first blood en- 

 tered at 1.26 p. m. and feeding continued till 1.32 p. m. Placed on the 

 arm again at 10.15 p. m., April 1st, but wandered until 10.17, when it 

 settled to feed; first blood entered after three-quarters of a minute; 

 fed until satisfied, till 10.27 P- m -. excrement being voided at 10.24 p. m. 



Placed on arm again at 8.11 p. m., April 2nd, the nymph pale; first 

 blood entered after 2 minutes and feeding continued till 8.18 p. in., 

 until satisfied; no signs of an ecdysis. Placed on arm again at 10.12 p. 

 m., April 5th, 1910, after three days of starvation. Nymph very pale, 

 shrunken, the alimentary canal filled with a thin, dark streak of ex- 

 crement. Too weak to pump blood, though effort was continuous up 

 to 10.29 p. m. Slightest jar would cause relaxation and the louse 

 would drop off or turn over on its back. Discontinued attempts to 

 feed at 10.31 p. m. and lay inert on its back. Replaced in vial. Died 



April 6th, 1910. 



Nymph III. 



Hatched at 10 a. m., 31 st March, 1910. Perfectly white. Placed on 

 arm at 2.37 p. m., March 3ist. It immediately began to crawl up to 



