356 THE CANADIAN ENTOMOLOGIST. 



On being assured of the novelty and importance of his observation, 

 Mr. Seal promised to watch for the subsequent appearance of similar 

 larvEe, and on September 20th last was able to forward other specimens 

 which appeared after a rain which occurred about the 15th of September 

 or a little before. Mr. Seal was able to distinguish between them and the 

 ordinary Culex larvae, and wrote that they were very scarce, perhaps one 

 of them to many thousands of the others. On the 25th of September 

 additional larvee and pupae were sent by Mr. Seal, and from these 

 specimens the accompanying drawings were made. The larva is 

 structurally of very great interest. On comparison with the larva of 

 Culex, which it resembles more nearly than that of Anopheles, it will be 

 seen that the respiratory siphon is longer, that the anal flaps are longer 

 and more pointed, that the hair fringe on the venter of the anal segment 

 is much longer and denser, and that the mouth-parts differ in very 

 important particulars. The labium is well differentiated into ligula and 

 paraglossa and the labial palpi are represented by little simple processes. 

 The lacinise of the maxillfe are beautifully modified into mandibular-like 

 structures, each with a long terminal tooth and stout basal tooth and three 

 intermediate teeth. These not only resemble mandibles, but have a 

 mandibular function, since they are indubitably used in the mastication of 

 food. Other mosquito larvae studied fed upon spores of algse and other 

 small particles which appeared to require no mastication, but this larva 

 descends to the bottom of the water and has been noticed to grasp a bit 

 of vegetation a half-inch long and to actually chew it. The maxillary 

 galea is membraneous and furnished with long terminal cilia. The 

 mandibles are long, brush-like organs, each element of which is 

 beautifully pectinate, as shown in Fig. 31 </. The clypeus is bent over 

 the front of the head, forming a chitinous overlapping lip which reaches 

 nearly to the maxilla. 



The duration of the pupal stage in specimens received was 4 to 5 

 days, and adults issued on the 27th and 28th of September, and confirmed 

 the determination of the species as P. ciliata. In the last sending young 

 larvae were found, shown at Fig. 32. 



The adult of this species is at once distinguished from all other 

 mosquitoes by the peculiar vertical scales on the legs, as shown in 

 the illustration, Fig. 33. The colour of the insect is dark yellowish, 

 with infuscated wings. 



