306 



portions of the segments; abdominal segments, except the last two, 

 with two longitudinal brown lines which occupy a submedian position 

 and converge slightly posteriorly; laterad of these on the same seg- 

 ments, a small rounded brown spot. 



Pupa. — Length, 2.5-2.75 mm. Yellowish brown. Thoracic re- 

 spiratory organ large, somewhat shoe- or boot-shaped, the apical half 

 turned forward, lying parallel with the side of thorax but distinctly 

 removed from its surface ; arrangement of bristles on thorax as in Fig- 

 ure 19, Plate XVIII; anterior thoracic bristle much the same in form 

 as the dorsal bristle of abdomen but more distinctly curved ; the other 

 thoracic bristles with their apices crowned with a weak hair. Apex of 

 lateral abdominal bristle with a weak hair, the dorsal bristle as in Fig- 

 ure I ; abdominal segments three times as wide as long, armed as in 

 Figure 7 ; dorsal surface granulose, a dark brown spot between the two 

 dorsal bristles and another on each side; ventral surface smooth; a 

 brown spot midway between the central line and lateral margin on each 

 side of the segments ; apex of pupa retained within larval exuvia. 



Imago; Male. — Black, slightly shining. Head, including palpi, 

 proboscis, and antennae, fuscous ; antenna longer than head and thorax 

 taken together ; antennal plumes blackish. Mesonotum shining black, 

 the surface obscured by dense yellowish pruinescence ; pleur?e black, 

 not shining, with whitish pruinescence; scutellum brownish yellow. 

 Abdomen black, shining, slightly pruinose ; hypopygium brown. Legs 

 yellow, fore and mid cox?e slightly browned. Wings clear, veins 

 brown, Halteres white. Body bristles brown, the short hairs yellow. 



Eyes contiguous ; antennae with the second joint globose, very large, 

 last three flagellar joints much elongated, the short joints beadlike near 

 base, but the last three or four with one side scooped out slightly, this 

 being most distinct on last joint, as shown in Figure 6, Plate XIX ; 

 palpi (Fig. 8) with the antepenultimate joint as long as the next two 

 combined, but little swollen. Mesonotum with 2-3 weak bristles in 

 front of wing-base, the discal hairs weak and very sparse; scutellum 

 with four bristles and weak discal hairs. Hypopygium as in Figure 

 18, Plate XXI. Wings narrow, third vein ends at almost three fourths 

 of wing-length ; first, at one third of third ; media forking slightly be- 

 yond cross vein ; cubitus forking at about same point. 



Female. — Similar to the male in coloration, except that the second 

 and third antennal joints, scutellum, and a small spot at anterior angles 

 of the mesonotum are yellow. 



Antenna as in Figure i, Plate XIX, the entire length not exceed- 

 ing the combined lengths of head and thorax ; palpus as in male ; pro- 

 boscis more elongate, its length about equal to height of head. Abdo- 

 men ovate. Legs slender; surface hairs distinct but not strong; basal 



