VoL xxiii] ENTOMOLOGICAL NEWS. 343 



Eagerly went to food at 10.26 p. m., April 7th, 1910; at first peristal- 

 sis strong; first blood entered at 10.31 p. m., the pulsations strong. 

 Pulsations practically stopped at 10.37 P- nr. but were resumed at in- 

 tervals as excrement was voided to make way for further supplies ; 

 feeding stopped by force at 10.46 p. m. Placed on host again at 

 11.13 a- m - April 8th, 1910; blood began to pulsate after three min- 

 utes; left food voluntarily at 11.26 a. m. and crawled several inches, 

 settling again at 11.30 a. in. but did not feed; removed to vial at 11.36 

 a. m. Placed again at 9.38 p. m., 8th April; began to suck at once till 

 9.43 without effect ; then crawled slightly and settled again at 9.43 ; 

 was successful up to 9.47, when it again began to crawl ; removed. 

 Died after several days. 



Nymfih IV. 



Hatched at 6 p. m., 31 st March, 1910. Perfectly white. Placed on 

 naked arm at 8.34 p. m.. March 3ist, its reaction to food being strong, 

 the nymph eagerly clambering off original piece of infested cloth 

 onto arm in bright glare (direct) 16 c. p. electric light; first blood en- 

 tered after three minutes ; the nymph fastened to the first spot its 

 body fell upon ; abdomen and thorax red from blood, the former dis- 

 tended after two minutes of continued pumping; red excrement 

 voided after five minutes ; finished feeding at 8.46 p. m. No pain ; as 

 with other nymphs. Placed on cloth in vial. 



Placed on food a second time at 5.06 p. m., April ist, 1910; blood 

 began to pulsate at 5.085/2 and feeding continued till 5.17 p. m. Placed 

 on food at 9.10 p. m., April 2nd, then pallid; first blood entered after 

 one minute and feeding continued until 9.19 p. m. Not fed again un- 

 til 10.331/2 p. m., April 5th, the nymph then weak, pallid, shrunken, 

 began to "feed" at once. Very weak; unable to keep its position long 

 enough to feed, after turning over on its back and then unable to re- 

 gain its feet. Replaced in vial at 10.45 P- rn. Died several days later. 



From' these tentative observations, one is rather surprised at the 

 rapidity of digestion in the young nymph, of its seemingly voracious 

 appetite, apparently requiring a constant or else frequently renewed 

 supply of nourishment and, at the length of the first postembryonic 

 stadium (under the conditions of the observations, food not being 

 constant or renewed at very frequent intervals). Obviously, the 

 nymphs require much more nourishment during stadium than do 

 those of the bedbug, for instance. From my experience in feeding 

 them, I formed the conception of them as being continually hungry, 

 often imbibing and excreting at the same time, occasionally ceasing 

 to feed and wandering slowly about over the host but not for long 

 intervals (of a day or more as in Cimcx Icctularius Linncaus), re- 

 turning again for their supply of blood after several hours have 

 elapsed. Under the conditions of the observations, when food was 



