CHARLES W. METZ. 145 



Posterior face of propodeura quite small ; borders rounded, without 

 raised ridge. Punctures of abdomen usually sparse; first segment 

 finely, sparsely punctured ; the punctures small and separated by 

 about six times the diameter of one puncture ; remaining segments 

 practically impunctate. 



Yellow JSIarkings. — Lateral marks short, not reaching more than 

 about one-third the length of scape above antennal sockets, but narrow 

 (much more so than in coloradensis) , and tapering to a point ; supra- 

 clypeal mark usually broader than long, (figs. 112-113). Except for 

 dark tegulae and wing bases the markings of the thorax are the same 

 as in P. coloradensis. Legs with front of fore tibiae, basal third of 

 middle and hind tibiae, and basal portion of tarsi yellow. 



Genitalia. — Resemble those of coloradensis but are much smaller, 

 apices of stipites rounded and heavy, instead of tapering ; basal lobes 

 less pronounced. Seventh ventral plate does not dififer from that of 

 P. coloradensis except in size, (Fig. 56). Eighth ventral plate differs 

 only in being smaller and somewhat stouter, (fig. 66). 



Female. — Resembles the male in size and puncturation. Abdomen 

 finely but usually closely punctured ; occiput usually almost impunc- 

 tate. Lateral face marks fill lateral areas below base of clj'peus, from 

 which they slant off gradually above to tip somewhat above antennal 

 sockets, (fig. 118). Legs black, except spots at base of tibiae; thoracic 

 markings as in male. 



Habitat. — Rocky Mountain States. Type locality, " Rui- 

 doso Creek, N. M., 7000 feet, taken on Scrophularia, July. 

 (E. O. Wooton)". 



Specimens examined : 68, representing N. M., Ariz., Colo., 

 Wyo., Nev., Ore. Taken at altitudes ranging from 4000 to 

 8000 feet, from June to August. 



This is a very variable species in both sexes. The ab- 

 dominal puncturation varies from that of the typical form 

 with only the first segment distinctly punctured, to others 

 with almost the entire dorsum punctured. A series of forty 

 specimens from Ormsby County, Nev. collected by C. F. 

 Baker almost all have yellow on the tegulse in both sexes, 

 and have heavily punctured abdomens. In some the lateral 

 face marks are broader above the antennae than in the typical 

 form, and end almost abruptly (fig. 113), but between this 

 and the typical form are all variations. Seven specimens 

 from Sheridan, Wyo. are about midway between the two 

 above forms in puncturation, and markings. They have just 



TRANS. AM. ENT. SOC . , XXXVII. (19) 



