372 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loe 



Pialea ecuadorensis, new species 



Figures 2,d; 3,a,c-f; 4,b,g-i 



Female: Length of entire specimen 7.25 mm.: wing length 7.25 mm. 



Color: Orange, black, and brown; head except antennal segments 

 II-III, pleurae except small spot on upper mesopleura, mesonotum 

 except anterior angle and lateral margin (fig. 4,^), and halter except 

 extreme base dull black; antennal segments II-III, coxae, basal 

 two-thirds femur II, tibia II, femur, tibia, and basitarsus leg III, 

 sternites I-V, tergite I, lateral margins and median triangular areas 

 of tergites II-V (fig. 4,i), cerci, and stronger wing veins dark brown; 

 anterior angle and lateral margin of mesonotum, proepisternum, small 

 spot on upper mesopleura, spot at upper junction of sternopleura and 

 meroplcura, postalar callosity, scutellum, and remainder of abdomen 

 orange; wing membrane faintly browned, squama light brown with 

 yellowish brown margin, pulvilli light brown. 



Pile: Golden yellow. Dense on eyes, occiput, thorax, squama, 

 abdomen, and legs except tarsi; that on head about as long as antennal 

 segments I-II combined, that on thorax about as long as antennal 

 segment III, that on abdomen sparse, longer than on thorax, intermixed 

 with dark brown hairs, particularly along posterior margins of 

 tergites I-IV, that on sternites without brown hairs, that on tarsi 

 quite short, appressed; hind tibia with dark brown and black pile, 

 that on antennal sgments II-III short, lightly brownish yellow, pilose. 



Head: With ocellar tubercle a point; frontal region only slightly 

 raised, antennal tubercle minute; proboscis hardly visible underneath 

 small proboscis tubercle; antenna little shorter than head height, 

 segment I of each antenna completely fused, about as long as hind 

 tarsal segments III-IV, segment II about half as long as I, round, 

 segment III about three-fourths eye height, rounded apically, com- 

 pressed laterally ; eyes occupy anterior third of head capsule, separated 

 a little more below than above antennae. 



Thorax: Maculated (fig. 4,A); scutellum much Avider than long; 

 squama nearly straight behind, narrow, nearly opaque, almost flat; 

 femur and tibia of each leg nearly equal in length, tibial spur about 

 as long as corresponding tarsal segment II, metatarsus compressed 

 (fig. 4:,g) ; wing as in figure 2,d except no crossvein present in first 

 posterior cell, and third posterior cell (subdiscal) divided near apex 

 (right wing only); four posterior cells, anal vein narrow, vein R2+3 

 incomplete, not reaching wing margin, faint, inserted slightly posterior 

 to r-m crossvein, m crossvein about five times r-m crossvein. 



Abdomen: Short, a little longer than thorax, widest at segment III, 

 maculated (fig. 4,i), somewhat sunken from loss of eggs, except 

 segments V-VI, rigid due to structiu-e of genitalia. 



