MOSQUITO BIOLOGY 229 



small very deep purplish brown scales on the disk, a median stripe and 

 broad stripes on lateral margins involving anterior angles, well defined, 

 of light greenish yellow scales with iridescent luster; a sprinkling of 

 dark blue scales among the purplish ones, particularly on the posterior 

 region ; over the roots of the wings are patches of brilliant blue scales. 

 Scutellum brilliantly blue scaled at the middle, sides silvery blue and 

 yellowish scaled in continuation of mesonotal lateral stripes. Postnotum 

 dark brown, nude. Pleurae and coxae dark brown, mostly covered with 

 silver scales with a slight yellowish tinge. 



"Abdomen depressed; dorsal vestiture dark metallic blue with a 

 greenish tinge at base and purplish at tip, eighth segment bright violet ; 

 first segment brilliant blue scaled, with silver patches at the sides ; lat- 

 eral margins of segments yellowish silvery, broadest near base and 

 forming conspicuous median indentations on fourth, fifth, sixth, and 

 seventh segments ; sixth, seventh, and eighth segments marked with yel- 

 lowish silver along posterior margin; venter yellowish silver scaled, 

 with a broad median, longitudinal, deep metallic blue stripe, becoming 

 narrow posteriorly and terminating near hind margin of seventh seg- 

 ment; eighth segment with numerous yellow apical setae; no caudal 

 tufts. 



"Wings rather narrow, smoky along the costal area ; basal cross- 

 vein oblique, joining the fourth vein beyond the anterior cross-vein; 

 costal vein blue and purple scaled. Halteres with pale stems and black 

 silver scaled knobs. 



"Legs slender ; vestiture deep violet and blue marked with white ; fem- 

 ora pale at base, bright brassy beneath and at sides, apex dark ringed ; 

 knees white ; front tibiae brassy on outer side ; middle tibiae brassy on 

 inner side ; hind tibiae with golden scales on outer side ; front and mid- 

 dle tarsi with second and third and all but apex of fourth segments bril- 

 liant white ; hind tarsi with extreme apex of third, all of fourth, and all 

 but the tip of fifth segments brilliant white. Claw formula, 0.0-0.0-0.0. 

 "Length : Body 7 to 10 mm. ; wing 6 to 7.5 mm. 



"Larva, Stage IV. Head subquadrate, longer than wide, sides nearly 

 straight, insertion of antennae rather prominent ; front margin deeply 

 emarginate at middle, produced on each side of it into a large promi- 

 nent lobe. Antennae cylindrical, slender, rather long, smooth ; two sepa- 

 rate hairs at outer third, followed by a short multiple tuft ; three small 

 terminal digits and a long seta. Two pairs of single hairs behind frontal- 

 lobes, a group of three in the sinus behind antennae, some small tufts 

 beyond middle of sides. Mouth brushes inserted on frontal lobes, folded 

 downward and backward, composed of ten stout, curved, lamelliform 



