CTJLEX BISTJLCATUS 307 



pilose, black, the others short, but rather longer than usnal, whitish, with a black 

 ring at insertions of hair-whorls ; hairs long, brown, and appearing less plumose 

 than usual. Coloration similar to the female. Abdomen elongate, depressed, 

 thickened towards apex; dorsally a few whitish scales at bases of segments, 

 forming obscure bands ; ends of segments with coarse setae, bristly posteriorly, 

 no lateral ciliation. Wings narrower than in the female, the stems of the fork- 

 cells longer, vestiture sparser. Claw formula, 1.0-1.0-0.0. 



Length : Body about 3 mm. ; wings 2.5 mm. 



Genitalia (plate 8, fig. 55) : Side-pieces twice as long as wide, tips conically 

 tapered, an irregular median prominence divided into three portions, upper one 

 short, with three stout setse, the others each with a single rod, the middle one the 

 longest. Clasp-filament long, slender, with an articulated terminal spine. 

 Harpes with a slender branch, curved at tip, bearing a row of teeth, outer branch 

 short and rounded. Harpagones divided at right angles, both branches simple 

 and pointed, the inner one the longer. 



Larva, Stage IV (plate 102, fig. 340). — Head rounded, broad, laterally lobed 

 behind the antennae, a notch at their insertion, narrowly excavate between the 

 long clypeal spines. Antennae long, with a large tuft a little before the middle, 

 basal portion before tuft stouter than apical part, well spined; three long setae, 

 a short one and a digit at tip. Both pairs of dorsal head-tufts and ante-antennal 

 tufts multiple. Mental plate quadrate, with triangular tip, a stout central tooth 

 and eight on each side, becoming longer basally, the last one stout and projecting. 

 Mandible quadrangular, widened outwardly ; two long filaments and two short 

 ones before tip ; an outer row of cilia from a collar ; a row of feathered filaments 

 with short tufts at their bases arising from low angular prominences on outer 

 margin ; dentition small, except the first, which is long, the four teeth confused 

 with two small ones below; a short spine before, two long serrate filaments 

 and five feathered ones within ; process below elongate, curved basally, obscurely 

 furcate, with a row of hairs on outer margin ; basal angle obsolete ; a row of long 

 hairs within; a row of long hairs at base. Maxilla elongate, rounded at tip, 

 divided by a suture ; inner half with two rows of very long, stout hairs and some 

 fine ones ; a row of long hairs at tip ; outer half with two small filaments near the 

 suture. Palpus slender, with four long claw-like apical digits. Thorax rounded, 

 wider than long, hairs abundant. Abdomen moderate, the anterior segments 

 shorter; lateral hairs in twos after second abdominal segment, the pair on sixth 

 segment very long; short hairs in very coarse, stellate tufts. Air-tube long, 

 about eight times as long as wide, slightly tapered to tip; pecten very long, 

 reaching nearly half way, followed by three sparse hair-tufts, two lateral tufts, 

 one within pecten, the other at apical fourth ; single spine of pecten with short 

 branches running nearly to tip. Lateral comb of eighth segment of many spines 

 in a triangular patch; single spine elongate, fringed evenly with long spinules 

 or with a smooth appendix at tip. Anal segment longer than wide, ringed by 

 the plate ; dorsal tuft of four long unequal hairs on each side ; a fringe of very 

 long spines on posterior margin of plate; a single lateral hair; ventral brush well 

 developed, of sparse tufts, confined to the barred area. Anal gills moderate, 

 tapered. 



The larvae live in the water at the bases of leaves of Bromeliacese and also 

 in artificial receptacles. Mr. Busck got them in a bromeliad and in a Spanish 

 bayonet ; Mr. Tower and Dr. Pazos obtained them in artificial receptacles. Dr. 

 Pazos states that the adults fly and bite in the daytime. He has found the 

 adidts in caves near the river Ariguanabo (Cuba). 



