846 MOSQUITOES OF NORTH AMERICA 



ments; third, fourth, fifth and sixth segments with yellow bristles at apical 

 angles. Wings narrower than in the female, stalks of the fork-cells longer, 

 the vestiture less abundant, the outstanding scales of veins narrowly ovate. 

 Claw formula, 1.0-1.0-0.0. 



Length : Body about 4.5 mm. ; wing 3.5 mm. 



Genitalia (plate 33, fig. 222) : Side-pieces over twice as long as wide, nar- 

 rowly conical ; apical lobe absent, basal lobe angular, its tip semi-detached as a 

 short column bearing a long coarse seta. Clasp-filament long, slightly swollen 

 in the middle, with a long articulated terminal spine. Harpes narrow, strongly 

 revolute, columnar, tip turned over and pointed. Harpagones absent (unless 

 the organ described as the basal lobe of the side-piece represents them). Unci 

 contiguous, revolute, forming a large basal cylinder. Basal appendages short, 

 bearing four long spines. 



Larva, Stage IV (plate 123, fig. 425). Head rounded, widest through eyes, 

 but more circular than usual ; antennae rather long, slender, uniform, smooth, 

 with a single hair at middle; both pairs of dorsal head-hairs single, ante- 

 antennal tuft small, three-haired. Skin of body smooth. Lateral comb of 

 eighth segment of about sixteen scales in a patch, each scale elongate, rounded, 

 evenly fringed with short spinules. Air-tube stout, about two and a half times 

 as long as wide, tapering outwardly; pecten of about fifteen evenly spaced 

 teeth, not reaching to the middle of the tube, closely followed by a single three- 

 haired tuft. Anal segment about as long as wide, with a dorsal plate reaching 

 well down the sides ; dorsal tuft a long hair and tuft of four hairs on each side ; 

 ventral brush well developed, confined to the barred area; anal gills very large 

 and thick, bluntly rounded, over twice as long as the segment, the upper pair 

 thicker, more blunt, and a little longer than the lower pair. 



The larvae live in the water in hollow trees. Mr. Urich forwarded specimens 

 found by Dr. J. R. Dickson in such a location. 



Forest regions of tropical South America. 



Agua Santa, Trinidad, June 24, 1905 (F. W. Urich). Reported also from 

 the States of Sao Paulo (Lutz), Rio de Janeiro and Bahia (Peryassii), Brazil. 



The thoracic ornamentation of the imago is subject to variation, the dorsal 

 vestiture being sometimes entirely golden. 



AEDES SEPTEMSTRIATUS Dyar & Knab. 



Aedes septemstriatus Dyar & Knab, Journ. N. Y. Ent. Soc, xv, 10, 1907. 

 Aedes septemstriatus Theobald, Mon. Culic, v, 485, 1910. 



Original Description of Aedes septemstriatus: 



Proboscis and palpi black; head bronzy yellow behind the eyes, two blue-black 

 spots upon the vertex separated by a golden line; thorax deep brown with seven 

 narrow golden lines and the front margin golden; a median dorsal line, narrow in 

 front, broadened towards the scutellum, a narrow line on each side of it which stops 

 at the basal fourth of the thorax, outside of these are two slightly oblique lines 

 which extend from the base to the middle of the thorax, lateral marginal stripe 

 extends down the sides in the form of large golden patches; pleura silvery. Abdo- 

 men blue-black with median white basal spots on some of the segments, the three 

 last segments spotted with silver at the sides; under surface black with white bands. 

 Legs; first pair black, the base of the first tarsal joint silvery; middle legs black, 

 knees silvery, hind legs black, femora tipped with silver, the base of the first tarsal 

 joint silvery. Tarsal claws of the female simple. 



3 specimens, Bluefields, Nicaragua (W. F. Thornton). 



Type. Cat. no. 10144, U. S. Nat. Mus. 



Differs from any described Aedes with simple claws known to us in the median 

 dorsal thoracic line. 



Description of Female of Aedes SHa>TEMSTRiATUS (Male and Laeva Unknown) : 



Female. Proboscis rather slender, uniform, labellse conically tapered ; vesti- 

 ture black ; setae minute, curved, black, those on labellae more prominently out- 



