238 CHARLES W. JOHNSON, 



Anier. Septentr. (Nevada) ; one specimen. 



The following descrij^tion I refer to this species, a study of the 

 type is necessary for certainty : 



Length % 11 mm.— Face black, with long, dense, whitish pubescence. An- 

 teuuie black. Thorax and scutellura black, with long whitish i)ile ; spines of the 

 scutellum yellow; halteres bright green. Abdomen black, shining; pile black ; 

 venter black, segments with a narrow posterior margin of yellow. Legs black ; 

 tips of the femora, basal half of the tibia? and two basal joints of the tarsi, yel- 

 low ; the remaining joints of the tarsi l)rownish. Wings hyaline, veins brown. 



Two specimens, Weber Lake, California, July 25 (Osten Sacken), 

 Mu.seuni of Com})arative Zoology, Cambridge, Mas-s. 



This species may be readily known by its uniform black color, and 

 conspicuous whitish pile. This species is included by Baron Osten 

 tSacken in the following remark in Western Diptera, p. 218 : "I have 

 furthermore three Stratiomyiie and one Odontomyise from the Sierra 

 Nevada (Weber Lake, in July) which I abstain from describing." 



Stratioinyia jfleigeiiii Wiedemann (PI. iii, figs. 21, 22). 



fitratiomys 3Ieigenu Wied., Auss. Zw. ii, 61, 2 (tab. viii, fig. 7). 



f t<tratiomys Uneolata Macquart, Dipt. Exot. 4e Suppl. 48, 6 (tab. iii, fig. 5). 



Rratiomyia mujularin Loew, Centur. vi, l(i. 



Stratiomyia marginalis Loew, Centur. vi, 17. 

 Length 'J, 9 11 13 mm. % . — Face black, with whitish pile. Antennae black. 

 Thorax black, whitish pile, longest and thickest on the pleura : scutellum black 

 apical margin (between the spines) greenish yellow, spines dark yellow, the tips 

 more or less brownish, the size of the apical margin varies from a narrow line to 

 an area about one-fifth the size of the scutellum. Abdomen black, with short 

 black and whitish pubescence, and marked with yellow as follows : second seg- 

 ment with triangular lateral markings narrowly reaching the anterior angles ; in 

 some specimens these markings are truncated or divided anteriorly, leaving sub- 

 triangular or oblong transverse markings at the posterior angles, and very small 

 markings on the anterior angles ; lateral margins of the third segment expanding 

 into triangles at the anterior angles, and connected at the posterior angles with 

 the transverse markings on the lateral posterior margins ; markings on the fourth 

 the same as those on the third, except that the transverse markings are much 

 shorter and narrower ; the form of the lateral margins varies, in one specimen 

 the lateral and transverse markings on the third and fourth segments are of 

 uniform width : fifth with lateral margins and an even dorsal line not reaching 

 the anterior morgiu ; venter yellow or greenish yellow ; second segment with an 

 oblong black spot on each side along the anterior margin, sometimes narrowly 

 connected; third, fourth and fifth with a transverse centi-al spot, usually attenu- 

 ated along the anterior margin, but not reaching the lateral edge ; the macula- 

 tious vary considerably, and in one specimen are almost obsolete. Femora black, 

 outer two-thirds of the anterior and middle tibiae black or brownish black, poste- 

 rior tibiaj reddish, annulated in the middle with brown ; in some specimens this 



