yo 



end is attached a clear transparent globular body 

 (the micropilar apparatus). Note that this body 

 is readily detached, often leaving a spike-like 

 process projecting from the thicker end of the 

 ovum. 



4. Make as many observations as possible 

 upon the egg-rafts, e.g., time necessary for hatching 

 of larvae, amount of desiccation they will with- 

 stand. 



The egg stage in S. fasciata lasts twelve to twenty-four hours ; 

 in C. jamaicensis, twelve hours ; in C. sollicitans, twelve hours 

 (Tayt.or). The eggs of Culicidae have but little resistance to 

 desiccation, but those of S, fasciata will hatch after being kept 

 ' dry ' for three months, 



Anophelmae. — The ova of Anopheltnae are 

 difficult to detect in nature, but maybe seen by the 

 aid of a lens on the margins of small pools, where 

 larvae abound. They are about 07 to i "o ram. long. 



Examination of Anopheline Ova : — 



1. Confine some female Anopheles as de- 

 scribed on p. 120. Endeavour to choose those in 

 which the ovaries are nearly mature (p. 97). Fifty 

 to one hundred and fifty eggs are laid. Remove the 

 piece of paper upon which the ova have been 

 deposited and place this upon a slide. Exaraine 

 with a low power in strong daylight, and the 

 mirror turned off. 



2. Observe the remarkable resemblance of the 

 ova to little boats, and the presence of the two 

 beautiful oval air cells placed upon either side, 

 acting as floats. (These are absent only in one 

 species as yet described, viz., M. turkhudi). Observe 

 also the presence of a white frill or a mere ribbed 

 rim around what would be the gunwale of the 

 boat (Fig. 54). 



