REPORT OX MOSQUITOES. 303 



yet water covered, a very careful examination was made and all 

 the places where larvse were earlier taken were tested — without 

 result so far as obtaining larvae was concerned. 



Description of the Larva. 



The larva and some details of structure are illustrated on 

 plate 95. When full grown, the larva (fig. 95, i) measures 7-9 

 mm., = .28-36 of an inch to the end of the ninth segment. 

 Specimens are usually grayish or brownish black, though, rarely, 

 they are rusty and almost brick colored. The head is trans- 

 x'ersely elliptical, nearly as large as the thorax, broadest imme- 

 diately behind the eyes. TwO' tufts, situated close together and 

 each composed of two hairs, arise from each side of the head 

 slightly lower than the antennae, and one large tuft is directly 

 at the base of each antenna. Eyes moderate in size, antenna 

 (fig. 95, 3) white, tipped with black, almost half as long as the 

 head is broad, thickest near tlie base, tapering slightly to about 

 the middle, then curved inwardly, becoming very narrow distally, 

 the apex with three long spines, one short one, and a little joint. 

 The tuft consists of from six tO' ten long hairs and is situated 

 above the middle, at the obtuse angle formed by the curve. The 

 surface is set with small stout spines, concolorous with the an- 

 tenna. The rotary mouth brushes are large and composed of 

 simple hairs. The mentum (fig. 95, 6) is broadly triangular, 

 with eleven or twelve teeth on each side of the apex. The man- 

 dible (fig. 95, 4) is normal and is best described by a reference 

 tO' the figure. The maxillar}^ palpus is clothed with soft, fine 

 hair, arranged in patches, has a large, long tuft at the apex and 

 a little joint at its base, with small articulated spines at its blunt 

 tip. 



The thorax is transverse, edges of the segments so marked as 

 to form three angles with tubercles from which arise tufts of 

 loiig hair. Two smaller tufts are on the cephalic margin. 



Abdominal segments i to 6, inclusive, have lateral tufts of 

 long hairs, while segments 7 and 8 have the tufts much reduced 

 in length. The combs of the eighth segment have from eighteen 

 to twenty-eight fringed scales (fig. 95, 9) in each patch, ar- 

 ranged as shown in figure 95, 7. The anal siphon is three and 

 one-half times as long as broad, with straight sides and does not 

 taper much toward the apex. The lateral rows of spines consist 

 each of fourteen to twenty toothed spines. The individual spine 

 (fig. 95, 8) is much broadened at its basal half and with five to 

 reven teeth. The ninth segment is a little longer than wide, with 



