30 U.S. NATIONAL MUSEUM BULLETIN 2 83 



Male. — Length of wing 0.90 (0.83-1.03, n=5) mm. Similar to the 

 female except for the usual sexual differences, but differing remarkably 

 in the armature of the legs as follows : an extremely strong black spine 

 arising ventromesally near base of fore femur; a similar spine arising 

 at distal margin anteriorly on hind trochanter (fig. 46i) ; a similar 

 spine arising from a strong tubercle ventrally at proximal third of 

 hind femur. Legs otherwise with hairs as in the female but much 

 longer and bristlelike, a few dark spinelike bristles at apices of femora; 

 fore femur with anterodorsal row of 5-6 strong spinelike bristles. Hind 

 TR 2.2; claws equal with bifid tips. Genitalia (fig. 46j, k) with tergum 

 IX short and rounded caudad, the submedian setose lobes prominent; 

 dorsal surface with only 4 long bristles in a subapical transverse row; 

 sternum IX narrow, ribbonlike; basistyle stout, mesal margin pro- 

 duced posteriorly to an angle (=mediangular process) near sclerotized 

 bridge ringing the parameres ; dististyle short, stout, with pointed tip ; 

 aedeagal sclerites modified, with a rounded hyaline anterior lobe 

 terminating the spiculate ventral membrane, just dorsad with a pair 

 of faintly sclerotized submedian plates connected caudally with the 

 transverse ring mentioned previously; parameres each with large, 

 platelike lateral lobe, a slender anterior arm; main body stout, slightly 

 arcuate, and held in midportion by the sclerotized ring mentioned 

 previously, distally expanded to an obliquely flattened tip with a 

 long laterally directed point. 



Distribution. — Malaya; North Borneo, Thailand. 



Types. — Holotype male, Pulau Pangkor, Perak, Malaya, 1 Apr. 



1959, R. Traub, light trap (USNM 69448). Allotype female, Tasek 

 Bera, Pahang, Malaya, 11 Oct. 1961, R. H. Wharton, light trap. 

 Paratypes, 5 males, 9 females. MALAYA: Pahang, Kuala Singgora, 

 18 July 1958, R. H. Wharton, light trap, 2 males. Selangor, same 

 data as allotype, 1 female. Selangor, Kepong Forest Res., Mar. 



1960, H. E. McClure, light trap, 1 female. Selangor, Kuala Lumpur, 

 July, Sept. 1958, R Traub, light trap, 1 male, 2 females. NORTH 

 BORNEO: Labuan Isl., Nov. 1958, D. H. Colless, swept, 1 male. 

 THAILAND : Chiang Mai, Apr.-May 1958, V. Notananda, light trap, 

 2 females. Loei Prov., Thai Li and Meung Dists., 1-9 June 1959, 

 Manop R., light trap, 1 male, 1 female. Nong Khai Prov., Meung 

 and Ta Bo Dists., 10-16 June 1959, Manop R., light trap, 2 females. 



Discussion. — The sexual dimorphism in the leg armature is most 

 remarkable, but unusual only to the degree to which it is developed 

 in this species. The close correlation in general coloration, palpus, 

 vertex and eye separation, wing features, especially the sparse seta- 

 tion of the costa, abdominal terga, and the similarly stout femora and 

 tibiae assures us that the sexes have been correctly associated. 



