944 MOSQUITOES OF NORTH AMERICA 



eus transverse, broadly rounded, brown with silvery pruinosity. Occiput 

 covered with flat, light green and blue iridescent scales, ocular margins silvery ; 

 cheeks and head beneath silver scaled. 



Prothoraeic lobes large and prominent, covered with broad, flat silvery-blue 

 scales and bearing a few coarse black setas. Mesonotum clothed with small very 

 dark brown scales on the disk, the lateral margins broadly silvery-blue scaled, 

 on anterior two-thirds of disk an illy defined metallic blue median stripe and 

 metallic green subdorsal stripes which posteriorly become confluent, the green 

 scales predominating posteriorly ; patches of brilliant blue scales over roots of 

 wings. Scutellum covered with greenish-silver scales. Postnotum brown, 

 slightly pruinose, nude. Pleuras and coxse brown, densely covered with silvery 

 scales. 



Abdomen subcylindrical, somewhat depressed, broadest at middle, with in- 

 dications of a dorsal ridge; dorsal vestiture basally olivaceous-green, shading 

 into a deep blue on flfth, sixth, and seventh segments, eighth segment violet; 

 second to seventh segments with large golden lateral blotches, seventh and 

 eighth segments finely margined with gold posteriorly; ventral vestiture 

 burnished golden, with a very narrow steel-blue median longitudinal stripe. 



Wing narrow, with a smoky tinge, particularly in costal region ; third vein 

 nearly incident with fourth vein at anterior cross-vein, basal cross-vein 

 oblique, joining fourth vein close to anterior cross-vein; costal vein metallic- 

 purple scaled. Knobs of halteres silver scaled on apex. 



Legs slender ; vestiture steel-blue ; femora brassy beneath ; front tibiae and base 

 of first tarsal segment brassy on outer side ; middle tibiae brassy on inner side 

 and with a sprinkling of brassy scales on outer side, base of middle tai'sus brassy 

 scaled; hind tibiae sprinkled with brassy scales on outer side; front tarsi with 

 second segment entirely white and base of third segment silvery above ; middle 

 tarsi with second and third segments entirely white ; hind tarsi with fourth and 

 all but the tip of fifth segment white. Claw formula, 0.0-0.0-0.0. 



Length : Body 7-8 mm. ; wing 7 mm. 



Male. — Proboscis long and curved, slender, tapering to a point. Palpi very 

 long, longer than the proboscis ; long joint stout, about two-fifths the length of 

 the entire palpi, below its middle a constriction giving the appearance of seg- 

 mentation ; penultimate joint about two-thirds the length of preceding one and 

 nearly as stout ; terminal joint long and slender, slightly curved and tapering 

 to a point, about as long as long joint ; vestiture metallic violet and purple with 

 a sprinkling of brassy scales, apices of all but last joint and constriction of long 

 one pale violet scaled ; beneath all but last joint mostly brassy scaled. Antennae 

 stout, densely plumose; last two joints long and slender, densely ciliate, the 

 others short, stout, with basal whorl of long, dense brown hairs ; second joint 

 long and stout, more than twice the length of the succeeding one, compressed, 

 without hair-whorl and with a broad dorsal crest of erect brilliant purple and 

 silvery scales; tori black with silvery pruinosity. Clypeus transverse, broadly 

 rounded, deep brown with silvery pruinosity. Vestiture of mesonotum pre- 

 dominatingly dark metallic blue, lateral margins broadly pale blue, a broad 

 median stripe, a patch over root of wings and posterior region brilliant metallic- 

 blue scaled; subdorsal stripes of coppery scales. Scutellum covered with 

 brilliant light blue scales which, at the side, become silvery-blue. Abdomen 

 deep blue at base, shading into reddish-purple on sixth, seventh, and eighth 

 segments ; claspers purple scaled ; venter bright golden scaled, with a very 

 narrow median longitudinal stripe of steel-blue, the eighth segment metallic 

 purplish-red; lateral ciliation short and delicate, pale yellow. Wings nar- 

 row, smoky, particularly along costa; basal cross-vein oblique, contiguous, 



