16 The Mosquitoes or Culicidae of Jamaica. 



the head. Two smaller additional ones placed externally and 

 more anteriorly. From the antero-lateral angles of the head a 

 pair of plumose hairs spring on each side, the largest reaching 

 to the distal third of the basal joint of the antenna. Antennae : 

 basal joint upper two-thirds spiny along the inner border 

 especially. A simple short spine arises on the outer surface 

 at the junction of the mid and lower thirds (Plate 2, Fig. 2, b). 

 Surmounting the basal joint are two lanceolate laminae and 

 a filamentous bifurcated hair, each lamina one-third length of 

 basal joint. Maxillary palp (Plate 3, Fig. 1, b), {half length 

 of antennal basal joint ; on the outer surface a short plumose 

 hair, and on the upper surface a number of small stout 

 spines. The palp is terminated by a wedge-shaped lamella and 

 fine spines ; two of these are much shorter than the other three. 

 Mandible : four to six simple stout curved bristles forming a 

 group at the outer angle with a number of smaller ones. 

 The concave borders of some of the bristles are finely serrated. 

 One large notched tooth followed on a lower plane by a series of 

 denticles. A row of very slender simple hairs arises from the 

 median border of the mandible. Lower lip of Meinert : pyramidal, 

 consisting of seven to eight highly chitinous rounded teeth 

 (Plate 3, Fig. 1, c). Thorax: several long plumose hairs, each 

 supported by a pedicel, spring from the angles ; on each pedicel 

 there is also a short curved lateral spine; sometimes only the 

 spine is present. These spines are not present on the abdominal 

 pedicels. The anterior border is ornamented by a band of white 

 pigment ; a V-shaped conspicuous mass of pigment is generally 

 present on the upper central surface ; this is absent in some 

 specimens. Abdomen : a pair of plumose hairs on the lateral 

 borders of each of the first three segments. The following 

 segments have only simple and small branched hairs. A pair of 

 palmate hairs on each segment from the second to seventh 

 inclusive. A pair of rudimentary palmate hairs on the first 

 segment. Leaflets 12-16. Each leaflet simple, narrowly lanceo- 

 late, not shouldered (Plate 2, Fig. 2, a). Anal papillae : equal, 

 ovate, one-third length of longest posterior bristles. Semilunar 

 pigmented markings are usually found on the second and fifth 

 abdominal segments. These may be only faintly represented or 

 absent altogether. Occasionally a median dorsal band of brilliant 

 white pigment extends from the respiratory stigmata to the 

 thorax. Colour of adult larvae is usually bright green ; some- 

 times dull olive green or orange grey. 



