182 MOSQUITOES OF NOETH AMERICA 



Occiput clothed with flattened dusky scales with an obscure metallic blue and green 

 luster; prothoraclc lobes large and prominent, well separated and clothed with 

 silvery scales, mesonotum dusky scaled, with an obscure bluish luster; pleura 

 ochreous yellow, covered with silvery scales; scutellum covered with large, flat, 

 broad, metallic blue-green scales; metanotum dusky brown with two longitudinal 

 impressions and a group of coarse bristles near the apex; abdomen dusky above 

 with metallic blue and green reflections, truncate at the tip, beneath yellowish 

 white with an undulate margin at the sides; wings long and narrow, the scales 

 of the veins dusky; legs long, moderately slender, without distinct raised scales, 

 dark, with blue and violet luster, the hind tibiae are white marked at the base; 

 the last four joints of the middle tarsi are bright white, extreme tip black, on the 

 hind tarsi the apical half of the third and the fourth and fifth joints white. 

 Length, 6 mm. 



Three specimens, Tabernilla, Canal Zone, Panama (August Busck, collector), bred 

 from larvae in bamboo joints. The larva resembles that of Joblotia digitatus Rondani 

 {=:nivipes Theobald). 



Type. — No. 10848, U. S. National Museum. 



Description of Femai,e and LiAbva of Jobix>tia mooilasia (Male TTnenown) : 



Female. — ^Proboscis rather long, xmiform, labellae conically tapered; vestitare 

 greenish black, setae rather distinct, curved black, those on labellae more promi- 

 nently outstanding. Palpi one-fourth as long as proboscis, stout, greenish black, 

 with a group of projecting setae below. Antennae slender, with joints subequal; 

 basal ones shorter, rugose, pilose, black, second joint luteous at base; tori sub- 

 spherical, with a cup-shaped apical excavation, luteous, dark brovni within; 

 hairs of whorls long, rather dense. Clypeus flat, rounded,- subtruncate, dark 

 brown, pale in middle, with a fringe of fine hairs around front margin, some 

 coarser hairs and a few scales at sides. Eyes black. Occiput densely clothed 

 with flat gray scales with a blue reflection, silvery in some lights, dull brown in 

 others, a row of short, erect, forked black scales on the nape; a pair of coarse 

 bristles at vertex, a row of setae along margins of eyes, the lateral ones longer. 



Prothoracic lobes elliptical, remote dorsally, densely clothed with shining 

 silvery scales and a few black bristles. Mesonotum pale brown, darker in the 

 middle, clothed with rather broad, curved brownish-black scales ; setae along sides 

 and at roots of wings dense, brown, short. Scutellum trilobate, clothed with 

 broad, flat metallic-blue scales, each lobe with a tuft of black bristles. Post- 

 notum elliptical, prominent, brown, with a groove each side of middle, the 

 grooves converging posteriorly where there is a group of short black setae, pre- 

 ceded by double elongate patch of small, flat iridescent scales. Pleurae and 

 coxae luteous, pleura with a brown spot, clothed with small, elliptical, flat silvery 

 scales and tufts of brown bristles. 



Abdomen subeylindrical, truncate at tip, dorsal vestiture black with green 

 and blue reflection, venter pale golden witii a white reflection, colors separated 

 on sides in an undulating line ; tip with numerous stiflE brown bristles. 



Wings narrow, hyaline, iridescent; petiole of second marginal cell one-third 

 as long as its cell, that of second posterior shorter than its cell ; basal cross-veins 

 mpre than its own length beyond anterior cross-vein; scales of veins brown, 

 with a blue reflection on costa, dense, overlapping, broadly elliptical. Halteres 

 black, except at base. 



Legs long and slender, the scales somewhat roughened, forming a small fringe 

 on apical half of hind tibia and base of first tarsal joint, black with a strong 

 violet-blue reflection ; posterior tibiae white at the base ; mid legs with the four 

 terminal tarsal joints white, the last one sometimes blackish at tip ; hind legs 

 with last two and outer third of the third tarsal joints white. Claw formula, 

 0.0-0.0-0.0. 



Length : Body about 7 mm. ; wings 5.5 mm. 



Larva. Stage IT (plate 93, fig. 302).— Head rounded-triangular in outline, 

 the neck small; labrum broadly triangular, fringed by the mouth-brushes; 

 mandibles strongly prominent; antennae small, slender, less prominent than 



