522 MOSQUITOES OF NORTH AMEBICA 



claws simple. Wings hyaline, the scales oval, mixed black and yellow, not forming 

 distinct spots. Length nearly 5 mm. 



St. Thomas, W. I. A male specimen collected by Mr. A. Busck. 



Type.— No. 8288, U. S. National Museum. 



Desckiption of Male of Mansonia flaveoi-tjs (Female and Labva Unknown) : 



Male. — ProbosciB moderately long, straight, thickened apieaUy, clothed with 

 yellow scales with a few black ones intermixed, particularly at base and apex, 

 an indistinct pale ring beyond the middle; labelke silver scaled. Palpi very 

 long, considerably exceeding the proboscis; long joint nearly three-fifths the 

 length of entire palpi, slender, somewhat thickened apically ; last two segments 

 stouter, subcylindrical, together about three-fourths the length of long joint; 

 last joint somewhat longer than penultimate ; last two joints and apex of long 

 joint bearing numerous very long yellow shining hairs; vestiture of palpi of 

 yellow scales with mmierous black ones intermixed ; bases and apices of last two 

 joints narrowly ringed with silver-white scales, a broad ring of white scales 

 before middle of long joint. Antennae plumose; hairs of whorls very long, 

 yellowish brown ; whorl-bearing segments very short, white, with yeUow rings at 

 insertions of hair-whorls, last two segments long, the penultimate the longer; 

 tori large, luteous. Clypeus luteous-brown. Occiput clothed with shining, 

 yeUowish-white, narrow, curved, recumbent and suberect scales and with many 

 long, erect, brown, forked scales scattered over its surface and extending down 

 the sides; ocular margin densely yellowish- white scaled. 



Prothoracic lobes widely separated, large and prominent, clothed with yel- 

 lowish-white scales and with many dark bristles. Mesonotum bright chestaut 

 brown, two lighter colored, broad, submedian, longitudinal, rather closely 

 approximated bare stripes from anterior margin nearly to ante-scuteUar space, 

 a broad, light colored bare stripe on each side of ante-scuteUar space, extending 

 well forward, ante-scuteUar bare space pale; vestiture of sparse, rather large, 

 narrow, curved, pale golden scales; setas of mesonotum abundant but rather 

 short, brown, those on the posterior portion long, very dense over roots of wings. 

 Scutellum clothed with pale-yeUow scales and with three groups of coarse long 

 setae. Postnotum yeUow-brown, nude, with faint indication of a median ridge. 

 Pleurae and coxae pale yellow-brown, with patches of whitish scales and a few 

 dusky ones. 



Abdomen very slender basally, second, third, and fourth segments narrow, 

 subcylindrical, with a median longitudinal ridge, third segment the narrowest ; 

 fifth, sixth, and seventh segments much depressed and expanded, the eighth 

 narrower ; vestiture mostly of deep yellow shining scales ; first segment ydlow 

 scaled with dusky scales along middle line and with many long deep yellow cilia 

 scattered over the surface; second segment with a sprinkling of black scales 

 across middle ; third segment densely black scaled basally and along the sides 

 while the middle and posterior portions are entirely yellow scaled; fourth, fifth, 

 sixth, and seventh segments entirely yellow sealed above ; eighth segment with 

 irregular patches and single black scales; claspers yellowish, with scattered, 

 erect dark-brown scales ; lateral cilia and a dorsal marginal series of erect cilia 

 very long, brown ; beneath the abdomen is yellow scaled, with scattered black 

 scales at sides and particularly at bases of sixth and seventh segments, the 

 eighth segment with many black scales scattered over its surface. 



Wings rather narrow, hyaline ; scales of two colors, dusky and light yellow, 

 the colors showing a tendency to group in patches but forming no definite 

 pattern ; a long black patch at base of third vein ; on the costa the dusky scales 

 predominate, leaving only a few patches of yeUow scales ; second marginal cell 

 long and narrow, considerably longer than its petiole ; base of second posterior 

 cell nearer base of wing than the second marginal cell ; basal cross-vein slightly 



