80 U. S. NATIONAL MUSEUM BULLETm 209 



County, Cypress Mills, Dallas, Del Rio, Fedor, Galveston, Gillett in 

 Karnes County, Llano County, Lytle, Mineola, Ranger, Rock Island, 

 Rosser, San Antonio, Victoria, and Wilson County); Utah (Moab); 

 Wyoming (Lingle and Torrington); and Mexico, Baja California (El 

 Arco Mine, Hamilton Ranch, 20 miles north of Mesquival, and San 

 Ignacio). 



Collection dates are rather evenly distributed through the warm 

 months. The extreme dates are Apr. 17 at Corpus Christi, Tex., 

 and Oct. 1 at Mineola, Tex. Flower records comprise Stillingia 

 sylvatica and Monarda sp. 



This subspecies ranges from the Western border of Iowa and all but 

 easternmost Texas to Wyoming, Arizona, southern California, and 

 Baja California. Adults occur during the warmer months. 



Genus" Priocne mis Schi^dte 



Medium or small sized species of slender to stout build, the fore- 

 wing of the Nearctic species 3 to 13 mm. long; clypeus rather small 

 for the Pepsini ; pronotum of moderate length, its hind margin broadly 

 angled to a weak median notch; second intercubital vein strongly 

 curved and oblique posteriorly, nearly straight and perpendicular an- 

 teriorly; second recurrent vein reaching second cubital cell near its 

 middle; cubital vein often fading out before the wing margin; base 

 of first discoidal cell without an irregularity in the membrane; ner- 

 vulus beyond basal vein by about 0.7 to 1 .3 its length ; nerveUus end- 

 ing some distance before juncture of cubiteUa with discoidella; anal 

 lobe elliptical, about 0.35 to 0.55 as long as submediella (pi. 1, fig. 7); 

 hind tibia either smooth or serrate dorsaUy, always serrate in females 

 of the Nearctic species; brush on inner side of hind tibia of moderate 

 width, without a subapical constriction; last segment of tarsi beneath 

 without preapical bristles in the Nearctic species, in some exotic 

 species with a few, rather irregularly rowed bristles; tooth on tarsal 

 claws small, erect, acute. 



This genus is mostly Holarctic, but the subgenus Sjjhiciostethus has 

 a marsupial type of distribution. The four recognized subgenera are 

 keyed out below. 



Key to the subgenera of Priocnemis 



1. Wings reduced, not large enough for flying 2 



Wings of normal size 3 



2. Thorax constricted at the middle; teeth on hind tibia weak, tuberclelike; 



Chilean species Sphictostethus (some females) (p. 81) 



Thorax not constricted at the middle; teeth on hind tibia chevron-shaped; 

 Nearctic species Priocnemis (some females) (p. 89) 



