50 ENTOMOLOGICAL SOCIETY 



collected near Washington, D. C. Prof. Smith has also let me 

 see larvae of Culex canadensis Theobald, which I cannot distin 

 guish from C. cantans very sharply. The air tube is a little 

 longer and slenderer, and the anal fingers are longer than the 

 segment, but these characters seem varietal rather than specific. 



These drawings cover all the mosquito larvae known at the time 

 of writing. It appears from Dr. Howard's book that Culex im- 

 piger had been bred ; but I learn from Mr. Coquillett that this is 

 an error, and that the flies bred by Mr. Pratt as there described 

 (page 79) really belong to C. pipiens. I have myself examined 

 Mr. Pratt's flies and agree with Mr. Coquillett. 



Finally, I show a drawing of a very curious larva without 

 mouth brush, the antennas jointed on the upper surface of the head 

 instead of on the sides, arid a lateral fringe on the widest part of 

 the head. The last thoracic segment and first two abdominal 

 ones bear lateral conical prolongations. The air tube is short, 

 uniform ; anal segment with four short, often invisible, fingers, a 

 paired dorsal and single ventral tuft ; no lateral comb on the 

 eighth abdominal segment. Hairs of last thoracic and first two 

 abdominal segments long, the rest shorter, but those of the eighth 

 abdominal segment longer than the preceding ones. 



Mr. Coquillett has named this species Corcthra brakeleyi 

 (Ent. News, xiii, 85, 1902). 



The following table presents the differences between our mos 

 quito larvae in synoptic form. I have not included Corethra or 

 Mochlonyx, genera belonging to the Culicidae, as the adults have 

 no proboscis and are, therefore, not ''mosquitoes." Mochlonyx 

 culiciformis is roughly figured by DeGeer without mouth brush, 

 and with the curious bent antennas arising from the side of the 

 head, not from the upper surface, as in our Corethra. The larva 

 is said to float horizontally in the water, but it has a distinct 

 breathing tube, not sessile as in Anopheles. 



