three species of the malarial genus Anopheles, namel}", Anopheles 

 maeulvpemiis (illustrated in fig. 3), Anopheles p>xmcthpenni8 (shown in 

 fig. 1, 5), and Anopheles crucians (shown in fig. 3). The two former 

 are found nearly all over the countr}^, but the last is a more Southern 

 species, although it has been found as far north as the south shore of 

 Long Island. 



As to the early stages, the eggs of Anopheles may at once be dis- 

 tinguished from the eggs of Culex by figs. 4 and 5, those of Culex 

 being laid in the raft-shaped mass on end and those of Anopheles being- 

 laid singly upon the surface of the water, always lying upon their 



Fig. 2.—Anop>ieles maculipennis: Male at left; female at right— enlarged (author's illustration). 



sides. The larvae of Culex, commonly known as wigglers, are familiar 

 to ahuost everyone, and are the common wigglers found in horse troughs 

 and rain-water barrels, which wriggle around in the water, returning 

 at frequent intervals to the surface to breathe, and when at the surface 

 hanging with simply the tip of the tail extruding, the rest of the body 

 being held below the surface at a great angle. What we have called 

 the "tail" is simply the breathing tube, which, with the common 

 Culex wigglers, is long and more or less pointed. With the malarial 

 mosquitoes, however, the wiggler, or larva, is of somewhat different 

 shape, as shown in figs. 6 and T, and when resting at the surface, which 



