WILLIAM G. DIETZ 113 



long, infuscate at base and ajicx, the latter pointed; lower valves very short, 

 scarcely two-fifths the length of the upper valves, broad, acuminate. 



Holotypc: d'; South Park, Colorado. June 20, 1916. (I-:. J. 

 Oslar.) 



Allotype: 9 ; topotypic, June 10, 1916. 



Paratypes: one male and one female, topotypic; one female; 

 Cochetopa, Colorado, July 3, 1913, (A. K. Fisher). 



In appearance this species appears closely allied to Tiptda 

 cervicula Doane, but the formation of the ovipositor, aside from 

 other characters, easily distinguishes it. Dedicated to Mr. E. J. 

 Oslar. 



A badly mutilated specimen, which I collected in this locality 

 — Hazleton, Pennsylvania — is closely allied. The head is deep 

 ferruginous, opaque, antennae missing; thoracic dorsum orange- 

 yellow, stripes as in oslari; scutellum, postnotum and base of 

 abdomen, dark orange-yellow. The specimen was immature, the 

 abdomen contracted; it is probabl}^ a female. 



One paratype in the collection of the United States Biological 

 Sui'voy. 



Pachyrhina hybrida spec. n. (PI. V, fig. 22.) 



Closely allied to and congeneric with F. oskiri. Antennae entirely black; 

 somewhat flattened, not serrate. Underside of head, pleura and sides of abdo- 

 men, dark yellowish. 



Male. Length, 8. .5 mm.; wing, 11 mm. 



Head. Dark brown above, underside and proboscis yellowish, periorbital 

 margin yellowish-white; face whitish on the sides, fuscous in the middle; 

 frontal prolongation very short, brown; palpi and mouth parts brown, the 

 former short. Antennae stout, not elongated, entirely black, flagellar joints 

 scarcely longer than wide, somewhat flattened, the last joint long, slender, 

 styloid; the antennae, with the exception of the four basal joints, clothed with 

 a dense pubescence, but without hairs or whorls of bristles. 



Thorax. Grovmd color blackish. The dorsum densely sordid yellowish- 

 pruinose. Pronotal scutellum whitish on the sides; the mesonotal stripes broad, 

 darker, the median stripe wider anteriorly and divided by a dark line; the 

 lateral stripes extending obliquely upon the scutum. Scutellum velvety black 

 anteriorly, brownish-yellow each side posteriorly. Postnotum with median 

 black line. Pleura dark yellowish-gray. Halteres yellowish, infuscate towards 

 the apex, club fuscous, apex grayish-white. Wings grayish, somewhat infu.s- 

 cate, especially in costal portion of the wing; cell M ' wath short petiole, other- 

 wise, venation as in P. oslari, vein So' present. Legs slender, brown; coxae 

 yellowish-gray, femora towards the base yellowish, and like the tibiae, blackish 

 towards the apex, outer tarsal joints black. 



TRANS. AM. ENT. SOC, XLIV. 



