318 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io9 



segments in proportion of 10:18:25:9:9, third segment moderately 

 swollen, 1.8 (1.5-2.0, n = 8) times as long as greatest breadth, with a 

 large, deep sensory pit opening by a small distal pore. Mandible 

 with 13 (12-14, n = 8) teeth. 



Thorax. — Mesonotum yellowish brown, with prominent pattern of 

 dark brown patches as figured, consisting principally of a broad 

 median anterior band and two lateral posterior bands associated with 

 numerous, more or less interconnected, smaller dark brown dots. 

 Scutellum yellowish brown, narrowly dark brown in middle and on 

 extreme sides; postscutellum and pleuron dark brown. Legs dark 

 brown; fore and mid femora with subapical and all tibiae with sub- 

 basal narrow pale rings; hind tibial comb with four (4-5, n = 7) spines, 

 the two nearest the spur longest, subequal. 



Wing. — Pattern as figured, small pale spot present over basal 

 arculus and over r-m crossvein, the latter indistinctly continued 

 broadly to costal wing margin; poststigmatic pale spot in cell R5 

 double, the posterior portion located behind second radial cell; distal 

 pale spot in cell R5 crescent-shaped, concave distally, not meeting 

 wing margin; a small, elongate pale spot present in cell R5 lying just 

 in front of vein Mi between the two anterior spots; apices of veins Mi, 

 M2 and M3+4 with pale spot at wing margin; small pale spot in cell 

 Ml far removed from wing margin; pale spot present straddling middle 

 of vein M2; pale spot in apex of cell M2 at wing margin; an hour-glass- 

 shaped pale spot in cell M4 with linear extension along vein M3+4 to 

 base of cell M4; two separate pale spots in distal part of anal cell and 

 two pale areas at base of cell; pale spot behind medial fork, one in 

 front of mediocubital fork, and one in front of midportion of stem 

 of mediocubitus. Macrotrichia numerous and long, extending to 

 base of cell M2 and anal cell; costa extending to 0.62 (0.61-0.65, n = 8) 

 of distance to wing tip. Halter pale, the base of the knob dark. 



Abdomen. — Brownish black. Spermathecae two, subequal, slightly 

 ovoid, each measuring 0.045 by 0.037 mm., the bases of the ducts not 

 sclerotized. 



Male genitalia: Ninth sternum with very shallow caudomedian 

 excavation; ninth tergum long and tapering with small caudomedian 

 notch and large, rather slender, apicolateral processes. Basistyle 

 with ventral root small and pointed, dorsal root slender; dististyle 

 with very slender, markedly bent, pointed apex. Aedeagus with 

 basal arch extending to about two-thirds of total length of aedeagus, 

 notched caudomesad, with basal arms distinctly curved; distal apex 

 slender and simple with rounded tip. Parameres each with basal 

 knob bearing a long anterior projection; stem slender and bent at 

 base, midportion moderately swollen, straight; distal portion abruptly 

 narrowed to slender, simple, filiform tip with a corkscrew twist. 



