93 



mg, about sunrise. On several occasions a number of noninfected 

 insects were let loose in the laboratory and we observed that upon ris- 

 ing at sunrise they attacked us viciously. 



It may be noted that this fact apparently explains the danger to 

 persons sleeping in an infected house and the comparative freedom 

 from danger in daylight communication with an infected town, 

 especially if the person remains in the open air and sunlight and 

 avoids houses, and confines his visits to the streets and parts of the 

 town free from the disease. 



. A number of experiments were made with the female Culex pun- 

 gens, but they could not, under any circumstances, be induced to feed 

 upon blood while in confinement. It was found that they preferred 

 death. 



* MOSQUITOES MAY BITE CADAVERS. 



The female Stegomyia fasciata will bite a cadaver, and, if on a 

 dependent portion, can draw blood. We have two observations on 

 this point. 



Narciso Nadal (case XX). A number of Stegomyia were applied twelve 

 hours after death, only one of which apparently obtained blood. 



Trinidad Martinez (case XXII). A number of female Stegomyia; fasciatce 

 were applied one-half hour after death, and three insects succeeded in feeding 

 with blood. 



As it has been shown by the work of the French commission that 

 the blood of yellow fever is not infective after the third day, the 

 danger of conveying the infection by means of mosquitoes feeding 

 upon cadavers must be exceedingly remote. 



Longevity. 



Several experiments were undertaken to determine the fact whether 

 the male Stegomyia fasciata, as has been stated, has a brief life his- 

 tory. We have one experiment showing that the male mosquito may 

 live and thrive over a month. 



Observation. — -A number of male mosquitoes were placed in a cage October 

 10 and subsequently fed on sirup. They were all alive and in good condition 

 on November 15, when they were killed and used for experimental purposes, 

 having lived thirty-six days. 



Ovipositing. 



Sometimes the female Stegomyia fasciata will lay a considerable 

 number of eggs at one time and then die. 



Observation. — (Mosquito XLIII. Francis, Re. No. 4.) This female Stego- 

 myia fasciata was taken from the breeding jar on- October 3, fed on normal 

 blood October 4, 6, 7, 8, and 10, then placed in a jar with water to tempt ovi- 

 positing, and banana feeding begun. On October 19 four males were added to 

 the jar. On October 23 the female was given another blood feed. On the 26th 



