NORTH AMERICAN DIPTERA. 237 



yellowish white tomentum ; scutellum yellow, the black base narrower than in 

 the male. Abdominal markings the same as the male, except that markings on 

 the second segment are usually contiguous at the posterior angles. 



Ill a male specimen in the U. vS. National Museum the marking 

 on the posterior margins of the third segment are contiguous, form- 

 ing a margin similar to that on the fourth. A female from Illinois 

 has the markings on the posterior margin of the third cojitiguous 

 and widely interrupted on the fourth. 



Montana (Morrison, Univ. Kans.) ; \Yisconsin (Loew); Brook- 

 ings, S. D. (Aldrich) ; Custer, S. D. ; War Bonnet Canyon ; Lincoln, 

 August ; and West Pt., Neb. (Univ. Neb.) ; Cheyenne, Wyoming, 

 June 15 (collection C. V. Riley) ; Spanish Peak, Col. (Osten Sacken ), 

 Mus. Comp. Zool. ; Carlinville, 111. ( Robertson). 



Stratioiiiyia senaria Loew (PI. iii, fig. 10). 

 Striifi(imi/in seiMriii Loew, Centur. vi, 7. 

 Length 11 mm. ; wing 9 mm. 9 • — Face, front and upper part of the occiput 

 black, with whitish tomentum; a yellow spot below the oc^elli, facial orbits and 

 lower part of the occiput, dull yellow. Antennae black. Thorax black, with 

 yellowish white tomentum ; scutellum yellow, with a narrow black base, spines 

 red. Abdomen black; second, third and fourth segments with transverse yellow 

 markings along the lateral posterior margins, those on the fourth short and nar- 

 row, third with a small yellow spot at the anterior angles ; fourth laterally mar- 

 gined with yellow; fifth with a narrow lateral margin and a central stripe not 

 reaching the anterior margin ; one specimen shows a short, obsolete, central 

 stripe on the fourth ; venter black, second segment broadly margined with yellow, 

 or yellow with black maculations on the lateral anterior margins; third, fourth 

 and fifth with a narrow posterior margin of yellow. Femora black, tips of the 

 femora, tibiae and tarsi yellow; in one specimen the anterior and middle tibife 

 are anuulated with brown in the middle, and the outer half of the posterior 

 tibiae is brown. Wings of a uniform dai'k brown. 



Two specimens, St. Augustine, Fla. 



In the type, a i , the markings on the second segment are some- 

 what triangular, and those on the third and fourth nearly of equal 

 size. 



Stratioinyia iievada^ Bigot. 



Stratiomi/s nevadse Bigot, Ann. Soc. Ent. France, xxxviii, 24. 



Long. 10 mill. % . — Nigra, facie, thorace scutelloque longe et dense cinereo 

 villosis ; abdomen nigro piloso ; halteribus fuscanis, clava prasina ; spinis scutelli 

 pallide testaceis, apice fuscis ; tibiis basi, late fere albis, tarsis fulvo notatis, apice 

 infuscatis; alls pallidissime flavis, macula stigniaticali pallide castanea. 



Entierement noire, excepte : cotes de la face, thorax, ecusson, longuement et 

 assez densement converts de poils gris; abdomen avec des poils noirs et courts; 

 epines de l'ecus.son blanchatres, a pointe brune ; balanciers roussatres avec la 

 massue d'un vert clair ; base des tibias largement blanchatre, tarses roussatres 

 avec. I'extremite brunatre; ailes un pen roussatres ainsi que le stigmate. 



TEANS. AM. ENT. SOC. XXII. JULY. 1895. 



