WILLIAM G. DIETZ 127 



Thorax ivory yellow, shining. Pronotul scutum with pale brownish stripe 

 each side of median line; srutellum brownish anteriorly. Lateral praescutal 

 stripes chestnut brown, curved slightU' outward, anteriorly; the median stripe 

 reddish-l)rown, with paler median line, and narrowed posteriorly. Scutum 

 concolorous, polished, each side with two large, coalescent, reddish-brown 

 spots, the antero-exterior spot being the smaller. Scutellum and post not um 

 concolorous, the former slightly, the latter more markedly, infuscate along the 

 middle. Legs slender, yellowish, pubescence very short, black, appressed, 

 tibiae slightly infuscate at tip, outer joints of tarsi brownish; metatarsi longer 

 than the tibiae. Wings hyaline with yellowish tint, costal cells pale yellow, 

 stigma bro^vn, costo-apical portion somewhat infuscate; veins C, So and Cu 

 yellowish, others bro\\Ti. Costal veins, vein R and veins M^- *'"' ^, finely and 

 sparsely setulose. \'enation as in figure. 



Abdomen sordid yellow, shining, with ill-defined, pale brown dorsal stripe, 

 the apical half of the seventh and eighth tergite nearly entirely light brown; 

 a lateral row of black strigae. Neuter pale, eighth sternite with V-shaped 

 incision, the margin of which is fringed with stiff, yellow hairs, longer and form- 

 ing a pencil on the somewhat prominent, lateral angles of the incision. Hypo- 

 pygium yellow; ninth tergite brown, moderately impressed anteriorly, a deep, 

 rounded impression posteriorly and emarginate in the middle of the posterior 

 border; each side of this emargination and from beneath the margin, projects 

 a black, tooth-like process. Outer appendages lanceolate, attenuate outwardly 

 and incurved towards each other. 



Holotype: d" ; Plummer's Island, Maryland. July 28, 1912. 

 (W. L. McAtee.) 



Paratypes: one male, Hazleton, Pennsylvania, August 20, 

 1912, (W. G. Dietz) has the lateral abdominal strigae, much more 

 marked; one male, Ridgeway, Ontario, Canada, August 15, 

 1910, (M. C. Van Duzee), has the antennal flagellum darker, the 

 occipital triangle not apparent, the thoracic stripes ferruginous. 

 A male specimen from Aweme, Manitoba, Canada, (E. Criddle), 

 has the occi])ut less shining, the triangular spot distinct, but paler. 

 Stigma a shade paler than in the holotj'pe. It is larger — length, 

 16.5 mm.; wing, 15 mm. 



In its shining occiput and unicolorous antennae flagellum, the 

 present species closely approaches P. s(klahs Loew, but is readily 

 distinguished, by its very slentler, pale yellowish-fuscous an- 

 tennae, the flagellar joints of which are not emarginate beneath, 

 the deeply incised eighth abdominal sternite and very deejily 

 impressed ninth tergite. 



TRANS. AM. ENT. SOC, XUV. 



