70 



" discal cross-vein " is decidedly before the middle of the discal cell. 

 The most striking feature of the venation in this specimen, how- 

 ever, and a variation not mentioned by Verrall, is the position of 

 the fifth vein, as the posterior cross-vein is wanting and the vein 

 extends to the edge of the discal cell ; the fusing gives the appear- 

 ance that it was a part of the fourth vein as shown in Figure 2. 

 If this variation should prove constant I would propose the name 

 americana. The typical venation, as figured by Meigen, is 

 shown in Figure 1. A true representative of the genus Spania has 

 not before been recorded from North America. Specimen in the 

 collection of the Boston Society of Natural History. 



Ptiolina edeta (Walker). 

 Spania edeta Walker, List Dipt., pt. 3, p. 489, 1849. 



This species belongs to the genus Ptiolina. I have taken it on 

 the "Alpine Garden" (5000 feet), Mt. Washington, New Hamp- 

 shire, July 4, 1914. It has also been recorded from Alaska by 

 Coquillett. 



Hilarimorpha pusilla, sp. nov. 



d\ — Head and antennae black, the third joint of the antenna about twice as 

 long as wide, minutely pubescent, and the two-jointed style slightly more than 

 one-half its length; ocelli yellow, prominent. Thorax and abdomen dull black 

 with a thin brownish pollen. Halteres dark brown. Legs light brown. _ Wings 

 brown, with darker-brown vein, the venation similar to the figure given in 

 Wilhston's Manual (fig. 1, p. 160) except that the second basal cell is slightly 

 longer. Length 2.5 mm. 



Two specimens: holotype, Hanover, New Hampshire, July 1> 

 1908; paratype, Norwich, Vermont, July 8, 1908. In the collec- 

 tion of the Boston Society of Natural History. 



Allognosta Osten Sacken. 

 Table of Species. 



1. Abdomen with the center more or less yellowish 2. 



Abdomen a uniform black or bronze 3. 



2. Thorax and scutellum black, discal cell large and angular, halteres dark 



brown at the base of the knobs fuscitarsis Say. 



Thorax and scutellum dark bluish green, discal cell small and less angular,, 

 halteres entirely yellow similis Loew. 



3. Antennae with the third joint long and cylindrical, pleura black 



obscuriventris Loew. 

 Antennae with the third joint short and conical, pleura reddish 



brevicornis, sp. nov. 



Allognosta similis (Loew). 



Metoponia similis Loew, Cent. IV, 44, 1863. 



A study of the types shows that two species are involved - 

 They consist of two males, one bearing the label similis, in 



