Yul.xxixj ENTOMOI.OCICAL NEWS. 267 



Although we have carefully observed a number of pupae, 

 we have not been able to witness the actual emergence of an 

 imago from a pupa when attached to a plant. When in con- 

 finement it would seem that the greater percentage of adults 

 emerge at night, usually between midnight and morning, pos- 

 sibly during the early morning hours. However, from what 

 we have observed on the emergence of the imagines, we are 

 convinced that the pupae detach themselves and ascend to the 

 surface when the time for the adults to emerge arrives. Pupae 

 have been noted attached to the roots at certain points and 

 after the ecdysis a close search has been made for the pupal 

 skins; none were ever found attached to the points previously 

 noted. When adults emerge in breeding jars containing Pis- 

 tia, pupal skins are found on the surface of the water. Re- 

 peated careful examinations of the plants for attached empty 

 skins, after the emerging of the adults, always proved nega- 

 tive. 



From laboratory observations we assume that a pupa at- 

 taches itself to the roots so lightly that the first struggles of 

 the imago, in attempting to escape from the pupal skin, alone 

 suffice to detach the air-tubes from the plant tissue, and allow 

 an ascent to the surface. An examination of an empty pupal 

 skin discloses that the imago forces itself through the dorsal 

 surface of the cephalothorax, and the position of the air 

 siphons /;/ situ would not permit of the passage of the imago 

 between them on its way to the surface which would be the 

 course indicated by the position frequently maintained by the 

 pupa when attached without causing them to become detached 

 from the plant. 



The* adult mosquito of this species is easily recognized bv 

 the narrow, light-colored band on the proboscis, large palpi, 

 brown thorax, truncated abdomen, wings densely clothed with 

 broad dark brown and yellow scales which give them a mot- 

 tled appearance, and the yellowish white bands on the tarsi. 

 While resting, the mosquito assumes a crouching position, 

 with the thorax and abdomen held close to and parallel with, 

 the surface on which it rests. The legs are held in such a 

 position that the femorotibia! joint, or knee, of each leg ex- 

 tends above the level of the thorax and resembles a small in- 

 verted letter V. This gives the appearance of the body being 

 suspended from the legs, rather than supported by them. 



This species of mosquito is tropical or subtropical in its 

 habitat. It is widely distributed, being found in some parts 

 of the Southern States, Mexico, Central and South America, 



