464 U. S. NATIONAL MUSEUM BULLETIN 216 part 3 



trochanters pale fulvous, the tibia and tarsus palest, the last segment 

 of tarsus brown; hind trochanters and femur light fulvous; hind tibia 

 light fulvous, its basal 0.08 db brownish fulvous, its apical 0.65 ± 

 progressively infuscate toward apex, the apical 0.25 ± quite dark; 

 hind tarsus white, the basal 0.25 ± of first segment and apical 0.4 of 

 last segment, fuscous. 



The coloration figured and described is the one t3^pical for the Al- 

 leghanian and Carohnian faunas. In specimens from the Canadian 

 zone and cooler parts of the Transition zone there is usually an increase 

 of both infuscation and of fulvous, the fulvous tinging parts of the 

 pleura, and the hind coxa more completely fulvous. In these speci- 

 mens there is often a pair of fuscous sublateral stripes on the face of 

 the female. In females from the Rocky Mountains and westward 

 the abdomen is usually more contrastingly banded with fuscous, 

 to produce individuals quite similar in appearance to M. discoidalis. 

 In the Sonoran fauna the infuscation of the hind tibia is usually 

 more intense and sharply defined, and the apex of the femm* of the 

 male is often fuscous. 



There are several forms in the Neotropic region which are very close 

 to this Nearctic species, and it seems probable that larger collections 

 and further studies will show that some of them are only subspecifically 

 distinct from it. 



Specimens (71 d^, 1049) : From Alabama (Langdale) ; Alberta (Medi- 

 cine Hat); Arizona (Oak Creek Canyon and Parker Creek in Sierra 

 Ancha) ; British Columbia (Enderby, Oliver, and Victoria) ; California 

 (Anderson in Shasta Co., Camino, Cedar Pass in Modoc Co., Davis, 

 Enterprise in Butte Co., Fish Camp, Hamilton City, Leona Heights, 

 Menlo Park, MiU Valley, Oaldand, San Jose, and Sierra ville) ; Colo- 

 rado (Boulder and Lyons) ; Connecticut (Lebanon) ; District of Colum- 

 bia (Washington) ; Florida (Winter Park) ; Georgia (Holcomb Creek 

 in Pickens Co.) ; Kansas (Riley Co.) ; Maryland (Bowie, Cabin John, 

 College Park, Glen Echo, Plummers Island, shore of Potomac near 

 Nanjemoy, Takoma Park, and Tliomas Road near Cumberland) ; 

 Massachusetts (Humarock) ; Michigan (Ann Arbor, Clare Co., East 

 Lansing, Gladwin Co., Isle Roy ale, Macldnac Island, Manistee Co., 

 Midland Co., Montcalm Co., Roscommon, and Van Buren Co.); 

 Minnesota (Itasca Park and Virginia); Mississippi (Vicksburg); 

 Missouri (Columbia) ; New Hampshire (Durham) ; New Jersey 

 (Moorestown) ; New York (Bemus Point, Farmingdale, Greene Co., 

 Ithaca, Ludlowville, and Shelving Rock on Lake George); North 

 Carolina (Andrews at 1,800 ft., valley of Black Mts., Crabtree Mead- 

 ows in Yancey Co. at 3,600 ft., Raleigh, Southern Pines, and Wallace) ; 

 Ohio (Hincldey, Montgomery Co., Puritas Springs, and Put-m-Bay 

 on South Bass Island) ; Ontario (Ottawa and Sudbury) ; Oregon (Sis- 



