370 



NEW YORK STATE MUSEUM 



ish, the veins scarcely dark . . . halteres pure white. 



Length 5| mm. 



Female. Differs from the male in the following particulars. 



Antennae entirely yellow, basal joint, palpi and upper surface of 



proboscis with a tinge of 

 brown; frontal spot brown; 

 scutellum with a fine 

 median line and its pos- 

 terior margin pale yellow; 

 abdomen yellow, dorsal sur- 

 face with a tinge of brown, 

 specially on the posterior 

 margin. The two little 

 white spots with pale 



brown margins also present on each segment. Anal segment 



brown, genitalia yellow, venter, legs, halteres, etc. as with the 



male . . . Length 5 mni. 



Fig. 109 Leaflike appendages of S . a m e r 

 icana 



Fig. Ill Ventral hooks of S. 

 americana 



Fig. 110 Labrum of S . amer- 

 icana 



Through the kindness of Dr Meinert we have been able to com- 

 pare the larva described by Johannsen with the European form. 

 It differs from the European S. plumicornis Fabr. in the 

 following particulars. The four long appendages of the antennae 

 are of equal length, while in the European form one is distinctly 

 shorter than the rest; there is a marked difference in the leaf like 

 appendages; and also in the ventral hooks of the last segment. 



The larva has been described by Johannsen in detail in Museum 

 bulletin 68. The pale yellow pup^ resembles that of Culex. 



