AEDES ANGUSTIVITTATUS 777 



margin by a narrow transverse stripe of the same color. In front of the base of the 

 wing are many pale golden hairs. Pleura pale scaled. Abdomen black above, with 

 light lateral patches at the front angles of the segments, beneath creamy white, 

 segments with a narrow black margin behind. Legs dark, unhanded, the femora 

 pale beneath and at base. All tarsal claws toothed in the female. 



25 specimens, Port Limon, Costa Rica; Zent, 20 miles from Port Limon; Rio 

 Aranjuez, near Puntarenas, Costa Rica (F. Knab) ; Bluefields, Nicaragua (W. F. 

 Thornton). 



Type. Cat. no. 10140, U. S. Nat. Mus. 



Nearly allied to Aedes trivittatus Coquillett, but the golden thoracic lines are 

 narrower. 



Description of Female of Aedes angustivittatus (Male and Larva Unknown) : 



Female. Proboscis moderately long and slender, subcylindrical ; labellae 

 conically tapered; vestiture brownish-black; setae minute, curved, black, those 

 on labellae more prominently outstanding. Palpi short, about one-fifth as long 

 as the proboscis; vestiture of blackish-brown scales and moderate black setse. 

 Antennae fiJiform, the joints subequal, rugose, pilose, black; second joint a 

 little swollen before middle, its base pale ; tori subspherical, with a cup-shaped 

 apical excavation, luteous, brown on inner side ; hairs of whorls moderate, sparse, 

 black. Clypeus rounded subtriangular, short, convex, dark brown, nude. Eyes 

 black. Occiput dark brown, clothed with flat appressed scales, except narrowly 

 on the median line, where there are narrow curved ones, pale yellow shading to 

 brown on the sides, sometimes forming a distinct patch, small and poorly dif- 

 ferentiated erect forked scales well back on the nape, pale in the middle, black 

 laterally ; bristles along margins of eyes black, a tuft projecting forward between 

 the eyes pale yellow. 



Prothoracic lobes elliptical, remote dorsally, dark brown, clothed with pale 

 yellowish scales and black bristles. Mesonotum dark brown, clothed with 

 narrow^ curved scales, dark bronzy-brown except a narrow anterior border and 

 a pair of slender, longitudinal subdorsal golden yellow stripes, widened pos- 

 teriorly and bordering the antescutellar bare space. Scutellum trilobate, gray, 

 with pale yellow scales, each lobe with a group of black bristles. Postnotum 

 elliptical, prominent, brown, nude. Pleurae blackish, coxae luteous, clothed 

 with patches of flat triangular white scales and rows of golden bristles. 



Abdomen subcylindrical, somewhat flattened, tapered posteriorly ; dorsal ves- 

 titure brownish-black with submetallic luster, a series of large lateral basal 

 segmental triangular yellowish-white patches; first segment with brownish 

 black scales and many fine pale hairs ; venter pale ocherous yellow scaled, the 

 segments with narrow, dark apical bands. Cerci black. 



Wings moderate, hyaline ; petiole of second marginal cell over half as long 

 as its cell, that of second posterior cell somewhat shorter than its cell; basal 

 cross-vein distant about its own length from anterior cross-vein; scales deep 

 brown, the outstanding ones broadly linear. Halteres whitish, with brown knobs. 



Legs moderate, the vestiture blue-black the under sides of the femora yellow- 

 ish nearly to the tip. Claw formula, 1.1-1.1-1.1. 



Length : Body about 4.5 mm. ; wing 4 mm. 



Life history and habits unknown. 



Central America. 



Port Limon, Costa Eica, September 28, 1905 (F. Knab) ; Puntarenas, Costa 

 Eica, September 13, 1905 (F. Knab) ; Bluefields, Nicaragua (W. F. Thornton) ; 

 Tabemilla, Canal Zone, Panama, May 13, 1908 (A. H. Jennings). 



Aedes angustivittatus might be mistaken for a variety of Aedes trivittatus, 

 differing in the width of the thoracic yellow stripes and their richer color. We 

 have no knowledge of the male genitalia nor of the larvae, but the difference in 



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