PSILOCEPHALA. 303 



Table of Species. 



1. Femora dark brown ; all tibia3 and tarsi 



pale yellowisl) brown ; (thorax pre- 

 sumably unstriped) alhina, Wied., p. 303. 



Femora black or blackish, with or with- 

 out white or silvery shimmer 2. 



2. Front tibiae blackish brown, or at least 



distinctly darker than posterior pairs. 3. 

 All tibiae (presumably) uniformly pale, , -.tt n ^^- 



at most tips darlcer" ' ...A 'T"-' ^}^^^h ?' ^^■'■ 



3. Thorax dull black, with two orey ' "^"''' ^^I'^b.,* p. 30b. 



stripes ; emarpinations of abdominal 



segments reddish or yellowish indic.a, Big., p. 30-1, 



Thorax dark grey, one median darker 

 stripe ; abdomijial emarginations not 

 coloured ; eyes absolutely contiguous, ceijlonica, Krob., p. 304. 



241. Psilocephala albina, Wied. 



Tliereva albina, Wiedemann, Zool. 3Ias'. i, pt. 3, p. 3 (1819) • id 



Auss. Zweifl. i, p. 233 (1828). " v / » •> 



Psilocephala albina, Krbber, Ent. Mitteil. Berl. i, p. 252 (1912). 



S. ^' Bead with silvery-white tomeutiun, extreme margins of 

 frontal triangle appearing dark brown; in certain lights can be 

 seen two dark parallel stripes, fading away downwards towards 

 the antennae; antenna} blackish brown, sparsely beset with black 

 bristles; palpi and proboscis long, with snow-white hairs; back 

 of head with whitish-grey tomeiitum and white hairs ; orbital 

 bristles black. Thorax dull grey, with yellow and grey pubescence • 

 scutelhim like thorax, witii black bristles ; sides of thorax blackish 

 grey-dusted and with grey hairs. Abdomen black, dull, with 

 somewhat strong silvery glistening and long whitish hairs, which 

 in certain lights, especially on the last segment, appear yellow • 

 2nd to 4th segments with yellowish bind margins. Venter 

 blackish, with grey pubescence, with yellowish hind mar"-ins to 

 segments ; genital lamelJae reddish yellow, with black and whitish- 

 yellow hairs. Legsi : coxae blackish, white-haired; femora dark 

 brown, covered with white pubescence ; tibiae and tarsi pale 

 yellowish brown, tips darkened. IVinfjs hvaline, veins weak 

 yellowish, 4th posterior cell closed ; halteres blackish brown, tips 

 of clubs whitish. Length, 9 mm. Type c? from Java, in the 

 Vienna Museum. 



$. "Frons narrow, dull blackish brown; epistome shinino^ 

 silvery white ; two dull black spots near each other above the 

 antennae, outlined with white ; antennae and back of head as in J . 

 Thorax and scutellum black, with very sparse yellowish and o-rey 

 hairs ; sides of thorax blackish, with silvery-white toinentum and 

 white hairs. Abdomen dull bhickish brown ; each segment bears 

 an ill-defined triangular silver-white spot on each side on the hind 



* These two species are almost certain to be identical. No characters of 

 differential value can be selected from Krober's descriotion of his unique type. 



