430 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 43. 



One male, Ithaca, New York, April, 1900 (O. A. Johannsen). 



Nearly related to spinosissima Strobl, but the presence of the ven- 

 tral hind tibial spine and the absence of the additional mid tibial 

 spines will separate it at once. Its black color and spinulose hind 

 tibia will separate it from any described species. 



GenusDOHRNIPHORA Dahl. 



In my paper on the subgenera in PJiora ^ I left the species I now 

 include in this subgenus in Phora Latreille, which is not tenable, but 

 at that time I did not consider the concinna group as congeneric 

 with doJirni Dahl. Kertesz includes incisuralis ^ Loew, venusta 

 Coquillett, and divaricata Aldrich in DohrnipTiora, which was created 

 for the reception of dohrni by Dahl^ in 1898. It is evident that 

 those species I now include in this subgenus are very closely allied 

 to dohrni, and I am therefore placing them all in Dohmiphora. 



^ TABLE OF SPECIES. 



1. Species with distinct large spines on hind tibiae in addition to the series of small 



hair-like setulee 2. 



Species without any large spines on hind tibise, at most some short setulse on 

 antero-dorsal or antero-ventral surface 3. 



2. Halteres black, thin veins complete ahdominaUs, p. 430. 



Halteres yellow, thin veins not reaching the wing margin abbreviata, p. 431. 



3. Entirely black species, at most the knee joints or fore tibise brownish yellow 4. 



Species mostly yellow, at most the thorax brownish * 6. 



4. Hind tibia? with short setulae on one or both anterior surfaces 5. 



No setulse on either anterior surface of hind tibise Jcnabi, p. 431. 



5. Large species 2§-3^ mm. third antennal joint large and pear-shaped in male; 4-5 



setulse on antero-dorsal surface in addition to the 4-5 on antero-ventral surface. 



crassicornis, p. 431. 

 Smaller species 1^-2^ mm. third antennal joint in male normal; only the antero- 

 ventral hind tibial setulse present concinna, p. 431. 



6. Larger species 2-3 mm; hind tibise with 4-5 serial setulse on antero-dorsal surface. 



incisuralis, p. 432. 

 Smaller species 1\~2\ mm; hind tiljise with setulse on antero-dorsal surface 



venusta, p. 432. 

 DOHRNIPHORA ABDOMINALIS Fallen. 



A large species, the female being very conspicuous with its red 

 abdomen. The male is entirely black, though it is said to have the 

 abdomen sometimes partl}^ black in Europe (Schiner). The com- 

 plete wing veins, black halteres, and presence of only two hind 

 tibial spines distinguishes it from ahhreviata von Roser. It is very 

 probable that this species occurs in America though so far not 

 recorded. 



>Joiam. Nat. Hist. Soc, Glasgow, 1909. 

 «Cat. Dipt., vol. 7, 1910, p. 398. 

 3 Sitzb. Ges. Nature Freunde, Berlin. 



< D. venusta and the male of incisuralis are sometimes very dark, but the legs and lower parts of 

 pleurae as well as the hind margins of abdominal segments are yellow. 



