MOSQUITO BIOLOGY 171 



C. apicalis is not a traveler, and seems very local, even where it occurs 

 in considerable numbers. 



[According to Howard, Dyar, and Knab (14), Knab found that the 

 eggs are laid in tiny rafts much like pipiens. Of two rafts studied one 

 contained 138 and the other 105 individual eggs.] 



DESCRIPTION OF THE LARVA 



When full grown, 6-7 mm. (.24-.28 inch) long to tip of ninth seg- 

 ment. Slenderly built, whitish or dirty yellowish, sometimes pale green, 

 from color of food eaten. Head very large in proportion to rest of body, 

 subquadrate, about one and one-half times as broad as long. Pale, 

 creamy white, totally immaculate. On anterior part of vertex four hair 

 tufts, each with two long hairs, large tuft of six or seven hairs at base 

 of each antenna. Eyes comparatively small, occupy widest part of head. 

 Antennae large, white, with apical third and base black ; broad two- 

 thirds from base, then, curving and becoming abruptly very narrow, 

 large tuft of long hairs on offset thus formed. Surface covered with 

 hair-like spines, apex has three long bristles, very short one and little 

 joint. Rotary mouth brushes, composed of simple hairs, bright orange 

 in color. Mandible triangular, without usual row of long spines on mar- 

 gin between apex and two large curved spines. Maxillary palpus pale, 

 with long white hairs at apex; basal joint extremely small with rather 

 large teeth at its tip. Mentum, broadly pentagonal, has six to eight 

 teeth on each side of apical one, but sometimes teeth extend farther to- 

 ward base, cutting off lateral angles and giving more triangular shape. 



Thorax, somewhat smaller than head, has acutely angled lateral 

 margins from which issue tufts of fine long hairs. Eight other tufts on 

 anterior margin, central two longest extending forward over head. 



Lateral margins of abdominal segments very nearly parallel, with 

 exception of anterior two, which have lateral prominences, giving rise 

 to four hairs each, while remaining segments have but two hairs to 

 lateral tuft. Small hairs at base of each tuft, seventh segment having 

 small tufts only. Eighth segment has large patch of twenty-five to fifty 

 extremely small elongated scales with long apical and lateral fringes. 

 Anal siphon pale yellow, very long and slender, usually half as long as 

 the larva from the base of the siphon to the head, inclusive. Broadest at 

 base, slightly constricted centrally, and with two series of weak spines, 

 from ten to fourteen in each series, extending one-third of its length 

 from base. These spines have from three to four long teeth, apical two 

 or three often crowding toward tip ; six to eight fine tufts on ventral 

 side between terminating spine and apex. Ninth segment at least one 



