394 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io9 



Female: Length of wing 0.96 (0.89-1.06, n=10) mm. 



Head., — Eyes narrowly separated, bare. Antenna with flagellar 

 segments in proportion of 19:14:15:16:16:16:16:16:22:24:26:26:44, 

 antennal ratio 1.10 (1.08-1.11, n=3); distal sensory tufts present on 

 segments iii, viii-x. Palpal segments in proportion of 10:22: 34:13 :15, 

 third segment extremely long, slightly swollen, 2.8 (2.4-3.3, n=l) 

 times as long as greatest breadth, with a very large, shallow, irregular, 

 generally double sensory pit. Mandible with 21 (20-22, n= 7) teeth. 



Thorax. — Mesonotum dark brown with a very prominent pattern of 

 yellowish patches, median anterior area with four spots arranged in a 

 four-leaf-clover design, lateral areas with 4-5 small pale spots, prescu- 

 tellar depression pale. Scutellum narrowly brown in middle, yellow- 

 ish on sides; postscutellum and pleuron dark brown. Legs dark 

 brown, bases of femora pale; femora with subapical, tibiae with 

 sub basal and hind tibia with apical, narrow pale rings; hind tibial 

 comb with four (n=9) spines, the one nearest the spur longest. 



Wing. — Pattern as figured; second radial cell long and fairly broad; 

 pale spot over r-m crossvein broken into two spots by a dark area 

 at anterior end of crossvein, the posterior one small and round, the 

 anterior one slightly larger; cell R5 with four small, well-separated, 

 pale spots arranged in a rhomboid, the distal one broadly extended to 

 wing margin; apices of veins Mi, M2 and M3+4 each with a pale spot 

 at wing margin; two pale spots in cell Mj, the second located far from 

 wing margin; two pale spots in distal part of cell M2; cell M4 with 

 a small round pale spot in center of cell; two separate pale spots in 

 distal part of anal cell and an irregular pale area at base; cell M2 with 

 a distinct pale spot lying behind medial fork and one lying in front of 

 mediocubital fork, one lying near base of cell; pale spot present at 

 basal arculus. Macro trichia sparse on distal third of wing; costa 

 extending to 0.65 (0.64-0.67, n=10) of distance to wing tip. Halter 

 knob brownish at base. 



Abdomen. — Dark brown, cerci pale. Spermathecae two, pyriform, 

 slightly unequal, measuring 0.056 by 0.042 and 0.049 by 0.036 mm., 

 the bases of the ducts sclerotized a short distance. 



Male genitalia: Ninth sternum without apparent caudomedian 

 excavation; ninth tergum with well-developed median cleft on caudal 

 margin, the apicolateral processes very short and blunt. Basistyle 

 with ventral root foot-shaped, the posterior heel very poorly developed, 

 dorsal root slender; dististyle nearly straight, slender, with bent tip, 

 Aedeagus with pointed basal arch extending to two-thirds of total 

 length, the basal arms slightly curved and slender; posterior portion 

 slender with simple, rounded tip. Parameres each with large basal 

 knob, stem moderately stout, bent near base, midportion slightlv 



