28 U.S. NATIONAL MUSEUM BULLETIN 283 



Sept. 1962, J. Scanlon, 1 male, 1 female; Meung and Nong Han 

 Dists., June 1959, Manop R., 1 male, 3 females. 



Additional specimens. — 16 males, 56 females, same data as above, 

 in alcohol, from: CEYLON: Colombo, 1 female. MALAYA: Sel- 

 angor, Kuala Lumpur, 14 males, 48 females. THAILAND : Chiang 

 Mai, 1 male; Minburi, 1 female; Nakhon Prathom, 1 female; Nontha- 

 buri, 1 female; Pechaburi, 1 female. 



Discussion. — This species has male genitalia nearly identical with 

 fusciterga, new species and fuscipes, new species, but the former can 

 readily be distinguished by the extensive infuscation on the second 

 abdominal tergum; the latter has the hind femur totally dark. 



Brevicostalis Group 



Diagnostic characters (fig. 46). — Differing markedly from other 

 Eukraiohelea by the short costa (0.55 of wing length) ; the stout femora 

 and tibiae; the male fore and hind femora and hind trochanter which 

 bear a prominent stout black spine; palpal segment III with subdivided 

 pit bearing long sensilla; antennomeres III-X elliptical in shape with- 

 out preapical collar; wing with weak surface micro trichia; costa having 

 widely spaced setae; Ri well beyond r-m, the two not in a line; r-m 

 short and stem M comparatively long; tarsomere IV not unduly 

 bilobed; V without ventral batonnets; female genital sclerotization 

 with elongate sternum IX, the internal lamellae much attenuated 

 and bent anteriorly with mesal knob; spermathecae pyriform with 

 hyaline perforations. Male genitalia with parameres not as long as in 

 most Eukraiohelea, with large lateral lobe and narrower anterior arm ; 

 parameres confined within a dark bandlike sclerotized bridge extend- 

 ing between caudomesal angles of the stout basistyles; aedeagal 

 sclerites inconspicuous, appearing as faintly sclerotized lips to the 

 genital pore. 



Species included: Stilobezzia brevicostalis, new species; S. minima 

 Kieffer from India may possibly belong here. 



6. Stilobezzia (Eukraiohelea) brevicostalis Das Gupta and Wirth, new species 



Figures 40, 46 



Female. — Length of wing 0.85 (0.77-0.91, n = 10) mm; breadth 

 0.34 mm. 



Head: Brownish, antennomeres III-X paler basally, palpal seg- 

 ments IV-V paler. Eyes (fig. 46a) broadly separated; vertex with 10 

 hairs. Antenna (fig. 40) with III-XV lengths as 11-5-5-5-6-6-6-6- 

 10-11-11-12-16; AR 1.20; III-X elliptical without distinct preapical 

 collar; XV without terminal seta. Palpal segments (fig. 46c?) with 

 lengths in proportion of 4-8-12-7-11, length of IV variable, some- 



