2l8 



ENTOMOLOGICAL NEWS. 



[May, '15 



within a short time after they emerged and were easily re- 

 moved. 



After the larvae were removed from the dishes, the un- 

 hatched eggs were separated from the empty egg shells and 

 the few larvae that had failed to swarm and remained in the 

 Ggg heap by means of the hand lens and needle used in count- 

 ing, and by making a count of the unhatched eggs the percent- 

 age of emergence was obtained. 



The percentage of emergence of larvae from eggs of each 

 tick is as follows: 



Tick No. .1 2 3 4567 8 9 10 II 12 

 Percentage 

 emerged. 99 89 58 94 n 78 91 87 76 85 59 73 

 The average emergence was 75 per cent. The percentage of 

 eggs from which larvafe failed to emerge was high, but it must 

 be taken into consideration that all the eggs were more or less 

 handled during counting and undoubtedly many that did not 

 hatch were spoiled by being bruised or punctured by the needle 

 used in counting. 



The foregoing observations were carried out in June, one of 

 the months of the rainy season in Panama. The Monthly 

 Meteorological Report of the Panama Canal gives the follow- 

 ing conditions for the month of June at Ancon and is given 

 here for its comparative value in case similar observations 

 should be made during the dry season : 



Remarks. 

 The accommodation of the tick to environment may be noted 

 in the case of Nos. 3, 7, 10, it and 12. None of these was 

 fully engorged. Under normal conditions they would have 



