MOSQUITOS OR CULICIDAE OF NEW YORK STATE ^ 347 



1, and July 27, and a number of others were obtained in grassy 

 shelters around the edge of a lily pond full of fish. Dr Smith 

 states that the little creatures remain almost motionless for 

 hours, some at the surface, others below at various points, the 

 former in a position intermediate between that assumed by 

 Anopheles and that characteristic of Culex. Larvae transformed 

 the last of July, and the pupae were just as odd as the larvae, 

 reminding one of Lycaenid chrysalids with breathing tubes. They 

 remained at the surface, seemed to have little motive power and 

 were easily submerged and drowned. Adults appeared Aug. 2, 

 giving a period of four and one half days for the pupa. Larvae 

 were also met with Aug. 13, Sep. 17, Oct. 14 and 20. In each case 

 half to full grown specimens were found. 



CORETHRA 



This genus is remarkable because the first tarsal segment is 

 shorter than the second, and in the four species we have studied 

 there is only a pseudo-articulation between the two. It 

 appears to be a case where reduction is in progress. The larv%'i 

 is not less remarkable than the adult and presents an intergrade 

 between the ordinary culicid form and that of Sayomyia. It may 

 be easily recognized by the possession of a culicid air tube in con- 

 nection with the enormously swollen thorax containing a pair of 

 large air vessels and a smaller pair in the somewhat enlarged 

 seventh abdominal segment. The larvae remain almost motion- 

 less and horizontal at variable depths in the water and very rarely 

 come to the surface. This is probably due to the large supply of 

 oxygen in the air vessels mentioned above. We have adopted 

 Coquillett's reference of this form, hitherto known as Mochlonyx, 

 to Corethra, and the species commonly known under the latter 

 name we have transferred to the genus proposed by the same 

 author, namely, Sayomyia. 



Corethra karnerensis n. sp. 



Two larvae belonging to this species were taken from a stagnant 

 pool at Karner IST. Y., May 14, 1902, and one male obtained. This 

 species was originally referred to the European C. v e 1 u t i n a . 



