PELASTONEL'RUS. 107 



Palpi of moderate size and yellowish color, covered on the outside 

 with snow-white dust, Antenna} yellowish-rod, the third joint a 

 little longer than broad, at the tip altogether rounded, its apical 

 half blackish-brown ; arista towards the tip feathered with short 

 hairs. Cilia of the inferior orbit black. Front violet, sometimes 

 almost steel-blue. Upper side of the thorax green with a thin 

 gray-brownish dust, upon the larger portion of the posterior part 

 violet ; the spot on each side of the suture is covered with white 

 dust ; the usual deep black, stripe-shaped double spot, immedi- 

 ately above the root of the wing is very distinct ; the small dot 

 of white dust in the vicinity of the hind corner, however, is seldom 

 distinctly visible ; on the posterior margin of the thorax there is 

 no spot of white dust. Scutellum shining black-green with deep- 

 black lateral corners ; only in faultless specimens there is a middle 

 stripe of white-grayish dust, surrounded by a more black color- 

 ing. Pleurae black, gray on account of whitish dust. Each seg- 

 ment of the abdomen has on the lateral margin a spot of white 

 dust, which is not very sharply defined, and the sixth, small seg- 

 ment, is entirely covered with whitish dust. Hypopygium shortly 

 pedunculated, greenish-black ; on the under side gray from pale 

 dust ; it reaches with its tip as far as the middle of the abdomen ; 

 the long brownish-black lamella? are narrow, at the end gently bent 

 upwards, reaching the basis of the abdomen ; the slender interior 

 appendages are also blackish-brown, beset at the tip with a few 

 long hairs. Fore coxae yellowish, middle and hind coxa? blackish 

 almost as far as the tip. Feet pale-yellowish ; the tip of the hind 

 femora is not of a dark color, and the bristles on the upper side 

 of the tibiae are not inserted on dark spots ; middle and hind tarsi, 

 with the exception of the roots, black-brown ; fore tarsi brown 

 only at the tip. Cilia of the tegulse black. Wings with a more 

 brownish-gray than blackish-gray tinge and darker towards the 

 anterior margin. 



Hob. Georgia; District Columbia. (Osten-Sacken.) 



II. Cilia of the inferior orbit pale. 



4. P. vagans Loew. % and 9 • — Obscure viridis vel nigro-neneus ; 

 antennarurn basi rata, ciliis oculoruui inferioribus pallidis, coxis antieis, 

 excepto apice, nigris, alis cinereis. 



Dark-green or bronze-black; the root of the antennas red; cilia of the iu- 



