of the Family Tabanicltc. 357 



other genera. His D. moroccanus, (J (Mem. Soc. Zool. Fr. 

 V. p. 623, 1892), from Morocco, is a male species of Silvius, 

 but I am not able to identify it with any description of a 

 Silvius from the Pahearctic Region, many of the males of the 

 described species being not yet known ; the eyes are hairy in 

 this specimen, and the face and the second joint of the an- 

 tennae moderately pubescent : his D. barbatus, ^ (/. c. p. 622), 

 from Piedmont, is also a male species of Silvius with the 

 face and the first two joints of the antennae densely pubes- 

 cent ; the eyes are bare : his D. hxcmatopotides , ? (/. c. p. 624), 

 from N. America, is a specimen of Tubanus frutellas^ Will. : 

 his D. nielas, ? (/. c. p. 625), from Sidney, is a specimen of 

 ApocampUi subcanus, Wlk. (see Ric. Ann. & Mag. Nat. Hist. 

 (7) viii. 1901, p. 287) : his D. notatus, ? (/. c. p. 622), from 

 California, is a species of Silvius apparently identical with 

 Silvius quncb'ivittahis, ? , Say, Journ. Acad. Phil. iii. p. 33 

 (1823) ; id. Compl. Wr. ii. p. 54 (1859); Wiedem., Auss. 

 zweifi. Ins. i. p. 200 (1828) (C/injsops) ; Osten Sacken, Cat. 

 Dipt. N. Amer, p. 226 (1878) ; Will. Trans. Ivans. Acad. 

 Sci. X. p. 131 (1888). 



Williston distinguishes his species S. polUnosus from Say^s 

 species by the absence of blacki>h stripes on the thora.^ ; 

 these are present in Bigot's specimen. Williston suggests 

 that these two species may belong to the genus Neniorius. 

 Bigot's specimen certainly bears a strong general resem- 

 blance to Chrysops [Nemorius) vitripenjiis, Mg., though the 

 first joint is considerably longer in C. vitripennis, as Williston 

 remarks. 



The latter author describes a species as Dichelacera scutel- 

 lata from Brazil, but suggests it may belong to the genus 

 Diachlorus, though the fore tibiie, not being curved, seem to 

 exclude it from this genus, and the absence of a tooth on 

 the third joint of the antennre from Dichelacera. If it 

 should be finally placed under Diachlorus, the name will have 

 to be changed, beuig already used for a species described by 

 Macquart. 



Diachlorus varipes, Rondani, is said by the author to be 

 nearly related to D. atcenia, Macq., which is a synonym of 

 D. ferruyata, F. 



The species named by Walker Diachlorus vurius, ^ , belongs 

 to the Pangoninae, having ocelli, and spurs on hind tibiae ; 

 the antennae being lost, it is impossible to identify it further, 

 but it probably belongs to the subgenus Diatomineura and 

 comes from Chili. In List Dipt. pt. v. Suppl. 1, p. 269, 

 W^alker notes that the fore tibiae are straight and slender, 

 thus differing from other species of the genus. 



