AMERICAN DIPTERA. ">7i 



again quite recently by Coquillett as occurring in Alaska, Colorado 

 and New Hampshire; by a second European species (velutina), and 

 by a third which has not heretofore been described. All have passed 

 in American collections as a single species. 



Triuenra aterrima Meig. (Plate viii, fig. 50.) 

 1764. Mouche noire avec mi trail noir sur la moitie" du bord extcrieur de I'aile. 



Geoflfroy, Hist, abreg, d. Ins. d. env. Paris, ii, 533, 76 (Meigen). 

 1794. Musca aterrima. Fabricius, Ent. System., iv, 334, 93. 

 l?i»!». Musca aterrima, Coqnebert, Illnst. icon. Ins., PI. 24, fig. 3. 

 L802. Phora aterrima, Latreille, Hist. Nat. Crust, et Ins.. lii, 464. 

 1804. Trineura atra, Meigen, Klass. u. Beschr. enr. zw. Ins. 1, 2,313, PI. xv. 



fig. 22. 

 1804. Phora aterrima, Latreille, Hist. Nat. Ius. et Crust., xiv, 394; Diet. 



d'Hist. Nat., xxiv, 197,594. 

 1S05. Tephritis aterrima, Fabricius, Kyst. Antl., 323. 



1809. Phora aterrima, Latreille, Gen. Crust, et Ins., iv, 360. 



1823. Phora atra, Fallen, Faun. Suee. Phytomyzides, 7, 7 (Schiner); Meigen 



says Trineura atra. 

 1830. Phora atra, Meigen, Syst. Beschr., vi, 224. 

 1830. Phora stictica, Meigen, 1. c, vi, 225. 



1849. Phora aterrima, Walker, List. etc.. iv, 1138 (occurrence in N. A.). 

 1864. Trineura aterrima, Schiner, Fauna Austr. Dipt., ii, 349. 

 1892. Trineura aterrima, Strobl. Wien Ent. Zeit., xi, 204. 



(Reduces stictica to a variety.) 

 1901. Trineura aterrima, Becker, Monog. Phor., p. 80. 



Geoffroy evidently did not apply a scientific name to the species. 



Coqnebert probably referred to the species as Musca aterrima, but I 



can find no positive statement. The chronological order of the three 



.publications in 1804 is unknown. Meigen in 1830 regarded his 



genus Trineura (1803) as a synonym of Phora Latr. (1796). I 



have nol ascertained the name under which Walker referred to this 



species, but Osten Sacken records it from North America on his 



authority. As far as I know, Schiner was the first to use the na 



Trineura after Meigen himself discarded it. 



Wholly deep velvet-black, in the female a little less intense. Wings hyaline, 

 the heavy veins usually black, but sometimes only the costa is black and the 

 others brown, costal vein reaching a little less than half the length of the wing. 

 Fourth vein only a little curved, ending at the apex of the wing, seventh vein 

 wholly absent or very indistinct, legs velvety black, fore tibise and tarsi yellow- 

 ish or reddish, male abdomen bent in a nearly uniform curve for the most of its 

 length. Hypopygittm in consequence turned partially forward. Front tarsi 

 not enlarged, middle and hind tibise with a single external bristle on the basal 

 half. Middle tibia; of male with four to six bristles on the hind side, female 

 with only two or three. 



TRANS. AM. ENT. SOC. XXIX. (48) DECEMBER. 1903 



