118 THE CANA.t)IAN ENtOMOLOGIST. 



entirely black to near the front margin of eyes, its surface sparsely and 

 microscopically wrinkled and jmnctured ; the remainder of the head is 

 yellow. The ocelli are slightly farther from each other than from the 

 eyes. The genal margins join the clypeus on either side almost in one 

 straight line. The clypeus extends abruptly, evenly rounded, about as 

 long as wide. 



The pronotum on anterior half is black, the posterior half and the 

 sides extending to shoulders are yellow. Over each eye is a large 

 triangular piceous blotch. The pronotum in front is nearly smooth, 

 posteriorly dark punctate. Viewed from the side the upper margin of 

 l)OSferior half is nearly straight, the lower margin between shoulder and 



lip is trisinuale, the median sinus stronger, and between this and the 

 margin a submarginal pitted groove. The tip of pronotum readies nearly 

 to end of first inner apical cell. 



The claval nervure is more than half the length of clavus. There are 

 three discoidal cells, due to a forking of the outer anteapical nervure and 

 a cross-vein l)etvveen the two ulnars. The basal cell is small and triangular, 

 and scarcely half the length of tiie anteapical cell beyond it. 'I'he two 

 outer terminal nervures are slightly curved towards the costa. The 

 tegmina are somewhat smoky, the nervures dark distally to nearly 

 colourless at the base. The claval suture and commisural margin are 

 blackened at the extreme base. The corium at l)ase is only punctured 

 along the nervures, while one-fourth of the clavus is coriaceous and 

 l)unctate. The central apical cell of wings is long and narrow, the sides 

 subparallel and the base truncate. 



MOSQUirO NOTES FOR 1906. 



It has been customary in the past to speak of mosquito larvi« or 

 wrigglers as dependent on atmospheric air, and to assert that they would 

 drown if shut off from the surface for more than a few minutes. When it 

 was discovered that some wrigglers with well-developed air-tubes were 

 really aquatic, and rarely came to the surface at all until ready to pupate, 

 it was necessary to modify that statement and to admit of numerous 

 exceptions. Yet the statement is still a serviceable one when applied to 

 the more troublesome species, and forms the basis upon which we 



April, 1907 



