6 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.63. 



circumstance that the face of most of the females of Scellus is less 

 yellow than in the males. The first joint of the antenna in the 

 female is considerably shorter than that of the male. Fore femora 

 and fore tibiae less stout, though the tip of the latter has also a denti- 

 form but less stout elongation; their under side has no excision be- 

 fore this tooth and the front side of the tibiae no thorn. Middle 

 femora not curved, on the larger half of their under side with a 

 few sparse bristles. Middle tibiae plain, upon the first half with a 

 considerable number of black bristles, upon the latter part of the 

 posterior side without the curly hairs which are found in the males. 

 Hind femora plain, slender toward the tip, but very little stronger 

 upon the second part of the underside with about six rather strong- 

 black bristles. Hind tibiae without the strong bristle which, in the 

 males, exists at the tip of the front side." 



Habitat. — Middle States. (Osten Sacken) ; Illinois. (Le Baron.) 



Type locality. — Bolton. North America. 



Distnhution. — Moscow, Idaho, June 14—18, 1895, June 19, 1900. 

 and July 27-28, 1910. Brookings, South Dakota, I. H. Orcutt, col- 

 lector. Hunter's Creek, Wyoming, September 11, 1895. Tennessee 

 Pass, Colorado, July 24, 1917, J. M. Aldrich, collector. Ipswich, 

 Mass., June 19, 1870, F. G. Sanborn, collector. Ottawa, Canada, no 

 date (collection of C. V. Riley). Chicago, Illinois, July 5, 1895, 

 June 9, 1899. Pullman, Washington, May 29, 1910, June 28, 1908, 

 W. M. Mann, collector. McHenry, Illinois, June, 1900. Moscow 

 Mountain, Idaho, July 8, 1916 (A. L. M.). Buffalo, N. Y., M. C. 

 Van Duzee, collector. Chambly County, Quebec, Changnon, collec- 

 tor (C. W. J.). Orono, Maine. Hampton, N. H. Shoreham, Vt. 

 (B. S. N. H.). 



3. SCELLUS SPINIMANUS (Zettergtedt) . .J 



Plate 1, fig. 1 ; plate 2, fig. 9 ; plate 3, fig. 24. 1 



Hydroplwrus notatus Zetterstedt (not Fabricius), Insecta Lapponica, p. 701. 



No. 4. 

 Hydrophortis spinimanus Zetterstedt, Diptera Scandinaviae, vol. 2, p. 445, 



No. 5. 

 Scellus spinimanus Zetterstedt, Loew, Monograph of North American Diptera, 



vol. 2, p. 204, No. 2. 

 Scellus spinimanus Zetterstedt, Aldrich, Entomological News, vol. IS, April, 



1907, pp. 135-136. 



" Male and female. — Thoracis dorso obscure aeneo, albido-poUinose, 

 opaco, abdomine ex viridi cupreo, nitido, halteribus subfuscis, alis 

 nigris, basi et costae dimidiae limbo subalbidis, margine postico toto 

 cinereo, lamellis analibus maris albis, basim versus infra nigro- 

 marginatis, apicem versus flaA'is, in summo apice puncto f usco notatis. 



" The upper side of the thorax dusky bronze-colored, with whitish 

 dust; abdomen copperj^-green, bright; halteres brownish; wings 



