i66 



ENTOMOLOGICAL NEWS. 



[September, 



Alaska, last Summer, I found a third species, whose description 



follows : 



Cyiiomyia hirta nov. sp. ; one male and one female. In size, color and 



proportions this species resembles very closely Cynomyia mortuornm 



Linn. The male dif- 

 fers from mortuornm : 



(1) by its much longer 

 and denser coating of 

 hair on the thorax, ab- 

 domen and legs, and 



(2) by the much smaller 

 size of the two terminal 

 chitinous hooks of the 

 hypopygium. The fe- 

 male may be d i s t i n - 

 guished from that of 

 mortuorum (i) by hav- 

 ing four instead of three 

 macrochaetae in the lat- 

 eral row of the flexor 

 surface of the hind 

 tibiae and (2) by the 

 discal macrochaetae of 

 the fourth abdominal 

 segment being stouter 

 and more numerous. 



Chaetotaxy . . . That of the female differs from the normal 

 chaetotaxy of Cynomyia americana only in two points: (i) it has 

 but two dorso-centrals in front of the transverse suture, and (2) 

 it has but one achrostichal behind the suture. The thoracal 

 macrochaetae of the male are more slender than in the other spe- 

 cies of Cynomyia that I have seen, and this with the unusual length 

 and density of the hair makes the chaetotaxy of the male rather 

 difficult to see. It does not, however, differ from that of the 

 female except in having (i) an additional posthumeral macro- 

 chaeta laterad the presutural, (2) a very delicate third anterior 

 dorso central, and (3) what is evidently an individual abnormality, 

 viz., the presence of three marginal scutellar macrochaetae on the 

 left side, while on the right side there is but one, as in the female. 



I think it highly probable that the chaetotaxy of the male will 

 be found quite variable, because of its long, thick coating of 

 hair, for in other Muscidae, under similar conditions, I have 

 usually found it variable. 



