218 Mosquitoes 



ii. Egg regularly elliptical, membrane showing 

 plainly in many small puffs. Pattern longest 

 transversely, a sort of hexagon with points to- 

 ward sides. Width into length three and one- 

 half times. (Fig. 23, page 114.) 



Stegomyia calopus. 



Egg not regularly elliptical, membrane at most 



but slightly puffed 12 



12. Pattern of ends differing from that of median 



half, that of ends an angled hexagon longer 

 than wide, that of middle a modified hexagon 

 wider than long. Egg shaped like 2 unequal 

 cones with bluntly rounded ends, placed with 

 the bottoms together. (Plate VII., Fig. 5, opp. 



page 200.) Ochlerotatus scrratus. 



Pattern same all over the egg 13 



13. Cells wider than long 14 



Cells not wider than long (both lines of this sec- 

 tion refer to cells toward the middle of the 

 egg) 1 5 



14. Greatest width of egg not at middle. 



OcJilcrotatus reptans. 



Greatest width of egg at middle. (Plate VIII., 



Fig. I , opp. page 202.) . OcJilcrotatus infirmatus. 



15. Pattern regular, of practically uniformly-sized 



figures 17 



Pattern irregular, of varying-sized figures. ... 16 



16. Cells irregular hexagons. (Plate VII., Fig. 3, opp. 



page 200.) OcJilcrotatus subcantaus- 



Cells irregular, longer than wide, not hexagons. 

 (Plate VIII., Fig. 2, opp. page 202!) 



Ochlerotatus tamiorJiyncJius. 



17. With cells noticeably longer than wide. (Plate 



VII., Fig. 6, opp. page 200.) 



OcJilcrotatus sylvestris. 

 With cells not noticeably longer than wide. . . 18 



