11 



tween the male and the female is readily discernible in the characters 



the antennae; in the former (fig. 3) these organs are prominent and 



ithery— decidedly hirsute. Another prominent point of difference 



ists in the length of the palpi; in the male they are long — almost as 



lg as the proboscis, but in the female they are short — less than one- 



ird the length of the proboscis. 



The palpi in both sexes are black, but are ornamented with white 



lies which, in the male, are arranged as four narrow bands, while in 



b female they are collected into a white tuft at the tip. 



The proboscis is black and is devoid of ornamentation, differing in 



is respect from both Culex toeniorhynchus and Gulex sollicitans, 



ch of which has the proboscis marked by a pale band in the middle. 



lese two insects bear a superficial resemblance to S. calopus, for 



lich they are not inffequently 



istaken by the uninformed. 



The head is clothed by the broad 



,t scales characteristic of the 



snus. These scales are black, ex- 



pt for a line of white down the 



iddle extending to the neck and 



narrow white border to the eyes. 



The thorax is dark brown, almost 



ack, ornamented with silvery 



hite patches and lines" of which 



le following are peculiar to and 



stinctive of this species, and en- 



)le one to recognize it at a glance: 



. well .marked, easily recognizable, 



are white curved line on either 



de of the back (mesonotum) be- 



veen which, but less obvious to 



the 



Fig. 3.— Appendages of head of Stegomyia 

 calopus (male). 



naked eye, are two delicate 



ledian parallel lines; a prominent transverse white line of scales 



n the scutellum. 



The abdomen is clothed with black and white scales, the latter col- 

 led in bands at the bases of the abdominal segments, and in distinct 



atches at the sides. 



The legs are black scaled, except for white bands which are arranged 

 5 follows: A basal band on the first joint of the fore, on the first and 

 icond of the mid, and on all of the hind tarsi except the last, which 

 i, as a rule, all white. Each leg is provided with a pair of claws 

 hich are equal in size in the female bat unequal in the male. They 

 iffer in other respects in the two sexes; in the female those of the fore 

 ad of the mid legs are provided with one tooth, those of the hind 

 >gs are simple; in the male all the claws are simple except the larger 

 ne of the forefoot. 



