232 CHARLES W. JOHNSON. 



at the i)osterior angles, third and t'onrtli with an oljlonj; spot at the hiteral jioste- 

 rior margins narrowly reaching the posterior angles; a large central triangle on 

 the posterior half of the fifth; venter black, the segments with a wide i)osterior 

 margin of greenish yellow; femora black, with long, black pile; tips of the 

 femora, the tibiae and tarsi, reddish ; tibiae with a medial band of brown. Wings 

 dnsky hyaline, veins yellowish ; discal cell emits three veins. 



9.— Face, front and vertex black, with yellow pile; a large, square spot on 

 each side of the facial prominence, two ovate spots on the front, and one on each 

 side of the ocelli extending over the vertical angle onto the cervex, and the occi- 

 put yellow. In some specimens the yellow of the face and front are connected 

 at the orbits, in which case the face and front might be described as yellow, lon- 

 gitudinally divided by black ; scutellum yellow, base narrowly black ; the lateral 

 abdominal markings usually the same as those of the male, though occasionally 

 the markings on the fourth segment are narrowly connected. 



Seattle, Wash. (Prof. O. B. Johnson); Mt. Hood, Oregon (Mor- 

 rison, Univ. Kans.); Laramie, Wyoming, Jnly 17 (Univ. Neh.) ; 

 Colorado, Jidy 8 ( Amer. Ent. Soc. ) ; Craig's Mt. Idaho ; British 

 Columbia ( Aldrich ). 



Two females from Colorado, and two out of eight of the males 

 from Craig's Mt. Idaho have the markings on the fourth segment 

 narr( )wly connected. 



Mitral ioiiiyia inelaiioslonia Loew (PI. iii. figs. 3 and 4). 

 Stratiomyia melanostoma Loew, Centur. vi, 10. 



Length % 9 12-15 mm. % . — Face yellow, with light yellow pile ; frontal 

 triangle, medial facial Hue and mouth, black ; occiput totally yellow, lateral por 

 tions somewhat dilated. Antennae black, second joint brownish. Thorax black, 

 with blackish pile; a tuft of yellowish pile on the pleura below the humeri ; 

 scutellum yellow, base narrowly black, spines reddish. Abdomen black : a lateral 

 posterior triangle on the second, an elongated spot on the lateral posterior mar 

 gins of the third and fourth, which narrows toward the lateral margins, usually 

 connected on the fourth ; and a central disc or subtriangular spot on the fifth 

 segment yellow ; venter yellow, base of the segments variably marked with 

 black, which is more conspicuous on the third and fourth segments ; femora black, 

 tips of the femora, the tibise and tarsi, yellowish ; tibise obscurely annulated with 

 brown. Wings brownish hyaline. 



9 . — Face, front and occiput, yellow ; vertex black, with a yellow spot on each 

 side of the ocelli extending over the vertical angle ; there is a narrow black 

 fasciae and fnmtal line that connects the black surrounding the base of the an- 

 tennae with that of the mouth and vertex ; sometimes the frontal line is bifur- 

 cated, thus forming a yellow spot below the ocelli ; there is also a small black 

 spot on the orbit opposite the base of the antennae, but this and the frontal line 

 in Some specimens is entirely wanting. The yellow spots on the third and fourth 

 segments are larger and connected on both segments, thus forming irregular 

 posterior borders; the discal spot on the fifth is also larger, leaving only a narrow 

 lateral and anterior margin of black. 



California (Baron) ; Mt. Hood, Oregon (^Morri.son, Univ. Kans.) ; 

 Summit Station, Sierra Nevada, July 4 (H. EdAvardsj. 



