392 THE CANADIAN ENTOMOLOGIST. 



the yellow fever is almost sure to be introduced there unless extraordinary 

 precautions are taken to prevent it. Under the present sanitary conditions 

 it would be impossible to control the disease once it gained a foothold. 

 However, after the French officials learned that S. calopus was one of their 

 most common mosquitoes, they said that steps wo.uld probably be taken 

 to control them, at least in Papetee. As an example of how easily relief 

 may be had in some instances I may give my experience on Tetioroa. 

 The first day there I was badly pestered by the great number of these 

 mosquitoes in the little native hut that had been assigned to me as my 

 laboratory. A brief search around the premises showed, that the water in 

 the tanks that were used for storing rain-water was swarming with mos- 

 quito larv?e. Less than half a pint of kerosene served to treat this source of 

 supply, and I expeiienced but little trouble after that about the laboratory. 



While these two species are principally day feeders, they will 

 occasionally bite at night after the lamps have been lighted. Usually, 

 however, they are satisfied with their day's work and give way to the no 

 less annoying or less dangerous night-flying species, Ctilex fatigans, Wied. 

 If one happens to be sleeping out of doors or in a bed provided with only a 

 poor screen, the low, sharp buzz and the vicious bite of these pests make 

 sleep almost impossible. Or if disturbed sleep does come, it is only to 

 dream of an arm or a leg swelling to horrible proportions, for one knows 

 that any one of these mosquitoes as she bites rnay be transplanting to one's 

 blood some of the filaria derived from a former meal on some of the 

 elephantiasis patients who have been seen during the day. 



Elephantiasis is quite a common disease on Tahiti and Morea. On 

 the latter island it is said to be much more common on the lee side, 

 where there is more low marsh land, than on the more rugged windward side. 



The larvse of C. fatigans are found in the same situations and often 

 in the same pools as S. calopus and 6^. sciitellaris. In a dipperful of 

 water from any of the gutters along the roadside would usually be found 

 the larvae of these three species. 



My specimens of S. saitellaris differ in some respects from the 

 descriptions of the typical forms ; the head has two white lateral bands ; 

 the white border of the eyes is very narrow or not apparent above ; there 

 are no lighter bands at the joints of the antennjB of the female ; the white 

 silvery line extends seven-eighths of the length of the mesonotum, much 

 attenuated posteriorly ; the white bands on the abdomen are represented 

 only by white spots on the sides, but are very distinct below. It is 

 probably close to var. sumare?tsis, Ludlow. 



