304 S. W. WILLISTON. 



joint distinctly longer than the second, very convex in front, brown or black. 

 Occiput thickly light yellowish pilose. Thorax black, light grayish yellowish 

 dusted, with four narrow stripes, the median ones divergent and posteriorly ab- 

 breviated, the outer ones abbreviated and interrupted. Scutellum dark testa- 

 ceous. Abdomen black, shining, the sides sometimes deep red ; with black hair 

 and moderately abundant spinous bristles, the sides in "front broadly free of the 

 latter ; fourth segment with an opaque, light yellowish gray, entire cross-band, 

 suddenly and moderately dilated in the middle in front to the anterior margin 

 of the segment, in the middle behind with a slender point. Legs luteous reddish, 

 the femora, except the distal end, black ; front tarsi of female moderately dilated. 

 Wings uniformly subinfuscated. 



Numerous specimens, C/onnecticut, Massachusetts, New Hampshire, 

 Pennsylvania, District of Columbia, California. 



This is very probably Walker's species, but I do not feel sure ; 

 his specimen was from Nova Scotia. 



Sanndersia luaculata n. sp. 



Mule. -Differs from f^. skiniferu, in the anteunre being rather smaller, in the 

 coxse and legs being wholly yellowish red, in the marking of the fourth ab- 

 dominal segment being confined to a symmetrical, much smaller, tridentate spot, 

 touching the anterior margin and emarginate on the sides; and in the larger 

 size. Length 14 mm. 



One specimen. New Mexico. This species must resemble S. ( Mlcro- 

 palpus) macula Macquart (Dipt. Exot. ii, 3, 46, 2, pi. v, fig. 2), from 

 South America. 

 Sauiidersia bicolor n. sp. 



'J, 9 ■ — Base of alidomen light yellow, the distal part pitchy black ; legs black, 

 tibiffi reddish. Length 10-14 mm. 



Head yellowish white, front with a broad ochraceous stripe. Antennse black, 

 basal joints more or less reddish ; third joint considerably longer than the second, 

 broad, strongly convex in front. Thorax black ; sides of dorsum, and the pleurse 

 in large part, obscurely yellow or testaceous ; dorsum light yellowish pollinose, 

 with four inconspicuous stripes, interrupted at the suture, the median ones diver- 

 gent and abbreviated behind. Scutellum obscurely testaceous. Abdomen light 

 yellow ; hind margin of the third segment above brown ; a large oval spot on the 

 first segment below the scutellum and the fourth segment, except a triangular 

 spot at the tip above, pitchy black ; sides in front broadly bare of spines. Legs 

 black, the tibije reddish or yellowish ; front tarsi of female moderately dilated. 

 Wings strongly brownish infuscated ; tegulfe browu. Venter with spines along 

 the middle. 



Numerous specimens, New Mexico, Arizona, California, Washing- 

 ton. The third antennal joint in the female is narrower than in the 

 male. 

 Blepliaripeza leucophrys Wiedemann, Auss. Zw. ii, 308, 49 {Tachina) ; 



Schiner, Novara Exped. 336 ; Blepliaripeza rufipalpis Macquart, ii, 3, 55, 1, pi. 



vi, fig. 1, ler Sujipl. 158 ; Bigot, Ramon de la Sagra, 815 ; Belvoisia rufipalpis 



V. d. Wulp, Tijdschr. v. Ent. xxvi, 25. 



Hab. — Connecticut, Pennsylvania, San Domingo, South America. 



