NORTH AMERICAN DIPTERA. 241 



Stratioiiiyia qiiateriiaria Loew (PL iii, figs. 25, 26). 

 ^tratiomyia quaternaria Loew, Centur. vi, 12. 



Length 'J, J 11 mm.; wing 9 mm. %. — Face black, whitish pile. Autennse 

 black, brownish on the underside of the third joint. Thorax black, with long, 

 brown, reddish pile, not quite as wide as the head ; scutellum black ; ajjical 

 margin and spines yellow. Abdomen black, with black and yellowish pile, and 

 marked with yellow as follows : a large, square, lateral marking on tlie second ; 

 a large lateral marking on the third, nearly as wide as that on the second, but 

 not touching the anterior margin its full width, and with an indentation on the 

 inner edge near the posterior margin ; fourth with a lateral margin widest ante- 

 riorly, or with a small triangle at the anterior angles ; fifth with a very narrow 

 or obsolete lateral margin, and a medial line not reaching the anterior margin ; 

 venter yellow, second segment with two elongated black spots along the anterior 

 margin, midway between the centre and lateral margin ; third with a central 

 black square of greater or less extent, sometimes consisting only of an anterior 

 marginal line; fourth black, with a wide lateral and narrow posterior margin (in 

 one specimen a narrow medial line) ; fifth black, with a narrow lateral and poste 

 rior margin. Abdomen wider than the female, sides of the second, third and 

 fourth almost parallel. Femora black, tip of the femora, base of the tibiae and 

 posterior tarsi yellow; outer half of the anterior and middle tibia? dark brown, 

 posterior tibia?, annulated with brown in the middle ; tarsi reddish brown. Wings 

 brown, hyaline ; veins red, discal cell emits three veins. 



9 . — Face, front and vertex black : whitish pile, a small spot below the ocelli, 

 and one on each side of the face yellow ; the yellow markings on the second ab- 

 dominal segment the same as in the male ; on the third segment the same as the 

 male, or much smaller, and consisting of a subtriangular spot at the anterior 

 angle and a narrow margin at the posterior angle ; the form of the yellow mark 

 ings on the third segment is the most variable character. 



Allegheuy, June 7, and Northumberland Coimty, Pennsylvania 

 (Aldrich) ; Agricultural College, Michigan, June 16 (Davis) ; Al- 

 gonquin, 111., Jime 4 (Dr. Nason) ; Denver, Col. (Bealesj. 



Stratioinyia iiiaenlosa Loew (PI. iii, figs. 13, 14, 15). 



Stratiomyiu maculosa Loew, Centur. vii, 19, 9 . 



Sfratiomyia msignis Loew, Centur. x, 7, % . 



Stratiomys denfuta Bigot, 9 Ann. Soc. Ent. France, xvi, 1879, 210. 



Stratiomys lacerata Bigot, % Ann. Soc. Ent. France, xvi, 1879, 211. 



Length % 9 14 mm. %. — Face black, with yellowish white pile; occiput nar- 

 rowly margined with yellow. Antennae black. Thorax black, with long, dense, 

 yellow pile; scutellum yellow, base black. Abdomen black, with yellow pubes- 

 cence, and marked with yellow as follows : the large lateral spots do not reach 

 the anterior margin, except near the angles ; second segment with a large sub- 

 triangular lateral spot; third with a large, square, lateral spot, which contains, 

 near the lateral margin, a small, oblique, black spot; in one specimen this spot is 

 wanting, and there is a small dorsal triangle at the posterior margin ; in this 

 specimen the square markings on the fourth segment contain a small oblique 

 black spot, and the yellow on the posterior margin is continuous. In the first 

 specimen (fourth segment) the spot is connected with the black, thus forming an 

 incisure into the square, yellow, lateral spot ; yellow not continuous on the pos 



TRANS. AM. ENT. SOC. XXII. (31) JULY, 1895. 



