180 PROCEEDINGS OF THE ACADEMY OF [Oct., 



above cited localities. As this character may be typical of nitidulus, 

 we had better adhere to Osten Sacken's name for our form. 



Spogostylum vierecki new species. 



Similar to vandykei Coquillett. Pile of face black, but a few pale 

 hairs near oral margin, margins of mesonotum, and pleura mostly 

 black. Thorax, scutellum, and abdomen with yellowish white tomen. 

 The wings also differ from each other in their maculation. 



cf . Black; tibiae, bases of tarsi, knob of halteres, lateral margins 

 of abdomen, part of venter, and genitalia, tawny. Wings hyaline; 

 basad of humeral cubital vein, middle spot in first basal, veins at 

 bases of first, second and third submarginals, first and fourth pos- 

 teriors, broadly clouded. Costa to tip grayish. Opaque; mesonotum 

 slightly shining. Pile of head black, with slight mixture of pale 

 along oral margin. Collar and pleural pile pale. Some stiff black 

 hairs or bristles along margins of mesonotum, of scutellum, and on 

 pleura at roots of wings. Pile of lateral margins of first abdominal 

 segment white, of remainder of abdomen, black. Legs with black 

 bristles. Tomen pale yellow on : head, thorax, scutellum, and legs. 

 On second and following abdominal segments, nearly white, and 

 dense. Three or four spots of black tomen on apical margins of 

 second to fourth segments. Structurallj'' normal of Argyramoeba, 

 with veins connecting second and anterior branch of third veins; 

 fifth vein between discal and third posterior cells withan angulation, 

 sometimes with a small stump into latter cell. Length, 6-9 mm. 



9 . Similar, but the tomen of abdomen is mostly yellow with the 

 series of black spots more pronounced on other segments. 



Type. — d^; Alamogordo, New Mexico, April 25, 1902, (Viereck & 

 Rehn), [A. N. S. P. No. 6203]. Parahjpes.—dd", 6 9 ; topotypical, 

 7cf , 1 9 ; El Paso, Texas, April 4-5, 1902, (Viereck & Rehn). 



ANISOTAMIA Macq. 



1840. Macquart, Dipt. Ex6t., ii, (1), 81. 



Some confusion exists regarding the validity of this and Ogccdocera 

 Macq. (1840). There is general agreement that the two may be 

 synonymous, and for the present they had better be considered so. 

 Becker 1 tries to separate them, but apparently, judging from an 

 examination of his descriptions and table, he did not know either 

 material or literature regarding these genera. Anistomia has priority 



1 1913. An. Mus. Zool. Ac. Imp. Sci. St. Petersb. xvii, 421-502. 1912. 



