CULEX REDUCTOR 399 



Length : Body about 3.5 mm. ; wing 2.8 mm. 



Genitalia (plate 12, fig. 84) : Side-pieces over twice as long as wide, rather 

 stout, tips conical ; inner process situated near middle, divided into two slender 

 arms, the outer bearing a leaf-like appendage with round tip and a cluster of 

 rods, the inner shorter, forked, each limb with a long filament with spatulate 

 tip; clasp-filament constricted in middle, with two terminal claws, two minute 

 spines before tip. Harpes with inner arm long, very slender, its tip bent at 

 right angles and bearing a comb-like row of teeth, Harpagones plate-like, 

 divided into lamellae, their tips forming projecting angles. Basal appendages 

 elliptical, oblique, setose. 



Larva, Stage IV (plate 106, fig. 353), Head rounded, somewhat wider than 

 long, widest through eyes. Antenna? long, rather stout, a tuft at the outer third, 

 the part beyond slender, the shaft spinulate towards the base. Upper pair of 

 dorsal head-hairs small, multiple, lower pair long, single; ante-antennal tuft 

 long, multiple. Body with the skin very pilose ; lateral abdominal hairs in threes 

 or fives on third segment, threes or fours on fourth, twos on fifth and twos or 

 threes on sixth. Lateral comb of eighth segment of rather large scales in an 

 irregular double row or slightly triplicate in middle. Air-tube six times as long 

 as wide, straight, gradually tapering to tip ; terminal hooks slender ; pecten 

 rather long, reaching basal third, followed by five tufts in a line, which are 

 progressively shorter towards tip ; two minute tufts towards dorsal aspect. Anal 

 segment longer than wide, ringed by the plate, becoming spinose behind ; dorsal 

 tuft of two long hairs and a short one on each side ; ventral brush well developed, 

 confined by the chitinous ring. Anal gills shorter than the segment, tapered, 

 equal. 



The larvae live in ground-pools. Mr. Busck got them along the edges of a 

 slowly running stream among grass and in a large, stagnant, illy smelling pool. 



Panama, 



Pedro Miguel, Canal Zone, April 24, 1907 (A. Busck) ; Tabernilla, Canal 

 Zone, April 26, 1907 (A. Busck). 



Mr. Busck obtained the larvge in x4.pril, but not at any other time. We there- 

 fore consider the species to be of seasonal occurrence. 



CULEX REDUCTOR Dyar & Knab. 



Mochlostyrax jamaicensis Grabham (not Culex jamaicensis Theobald), Can. Ent., 



xxxviii, 318, 1906. 

 Mochlostyrax jamaicensis Dyar & Knab, Proc. Biol. Soc. Wash., xix, 172, 1906. 

 Culex reductor Dyar & Knab, Smiths. Misc. Colls., quart, iss., lii, 257, 1909. 

 Mochlostyrax jamaicensis Theobald, Mon. Culic, v, 619, 1910. 



Obiginax Description of Mochlostykax jamaicensis: 



$. Head with pale yellow flattened scales at the middle and sides, many long 

 black forked scales at the back, each of these irregularly frayed along the upper ex- 

 panded border. Some long black hairs among the other scales. Proboscis black, 

 swollen at the apex, speckled with yellow scales, tip yellow. Palpi black, the 

 terminal joints yellow scaled. Eyes with white borders posteriorly. Clypeus dark 

 brown. Antenna dark brown, joints with scattered brown hairs, these are rather 

 larger and arranged in a ring below each clear area, suggesting a double set of 

 verticellate hairs. Prothoracic lobes black, somewhat prominent, covered with fine 

 scales and long black hairs. Mesothorax black, with two dark brown median bands 

 anteriorly. Surface covered with fine hair-like scales, a row of long black hairs on 

 each side of the mid line, another row at the edge near the prothoracic lobes, and a 

 group in front of the insertion of the wing. Scutellum dark brown, with fine scales, 

 six long bristles on the posterior border of the mid lobe, and four on each of the 

 lateral lobes. Metanotum dark brown. Pleura grayish, with a line of black bristles 

 down each side to the mid coxae, a cluster of bristles anteriorly between the front 

 coxae, several small patches of white hairs below the insertions of the wings. Abdo- 

 men black, and speckled with dull white scales, the latter denser at the bases of the 

 segments, forming a pronounced band at the base of the second segment, long white 



