48 , R. OSTEX SACKEN. 



cially in the middle; antennae blackish, seapus tawny; those of the 

 male apparently 15-jointed (13-{-2); flagellum with 12 beautifully 

 bearded joints; a thirteenth, elont^ated, linear joint has some scattered 

 hairs, but no beard like the preceding ones. Proboscis long, reaching 

 in the male, if bent backwards, to about the middle of the abdomen ; 

 rather conspicuously incrassated at the tip ; perhaps still longer in the 

 female (the abdomen of my female specimen is somewhat injured). 

 Thorax brownish-tawny, darker above, paler on the pleurae; a metallic 

 blue longitudinal line along the middle of the thorax reaches the scu- 

 tellum ; three similar marks on the pleurae, the upper of which is in 

 the shape of a short line running from the base of the wing towards 

 the head. Abdomen bi'ownish above, paler below ; knob of the hal- 

 teres brown, stem pale. Feet brownish, paler at the base ; a snow- 

 white dot on the upper side of the tip of the femora and of the tibitv; 

 when looked at very obliquely these white dots appear slightly pale 

 bluish, and the tibiae and tarsi likewise show a faint bluish reflection. 

 Wings clothed with brown scales, but showing, in an oblique light, 

 numerous blue reflections, especially a stripe near the basis, between 

 the third and fourth longitudinal veins. (Washington, D. C. ; Brook- 

 lyn, N. Y., by Mr. Brevoort.) 



Observation. — In my female specimen tlie scales are somewhat 

 rubbed ofl" on the feet, which for this reason appear pale-tawny ; still 

 the white dots are distinctly visible. 



