W. O. DIETZ ,J0O 



. median stripe fuscous, narrowly edged with darker, wide anteriorly, nar- 

 rowing posteriorly, median dividing line gradually widening, subfusiform; 

 spaces between the lateral and median stripes more yellowish and beset 

 with fine yellowish pubescence ; mesonotum behind the suture more grayish 

 fuscous, stripes indistinct. Scutel yellowish gray with median darker 

 line. Metanotum gray with narrow median and wider lateral, fuscous 

 lines. Pleura sordid yellowish, whitish pollinose dorsad to a dark brown 

 stripe extending from the neck to mesosternal suture, ventrad the dark 

 brown color gradually becomes effaced; mesosternum slightly infuscate. 

 Halteres fuscous, pedicle pale at base. 



Abdomen: Venter yellow, tergum yellowish gray, first tergite gray; a 

 narrow median and wide lateral, longitudinal, dark brown stripes, inter- 

 rupted by the pale latero-posterior margins of the segments and not ex- 

 tending beyond the sixth tergite; tergites 1 to 4 with a short, transverse line 

 each side behind the anterior margin. Eighth tergite brown with yellow 

 apical margin; eighth sternite dark brown, lateral incisions moderately 

 deep, lobes yellowish, densely clothed with pale yellow hair, the median 

 lobe narrower than the ateral lobes. Ninth tergite brown, slightly nar- 

 rowed posteriorly and impressed above behind the apex, the posterior mar- 

 gin somewhat produced in the middle and from its inferior margin arises 

 a short, downward projecting process which ends in a shorter median and 

 two longer lateral teeth, the latter somewhat diverging; ninth sternite 

 yellowish fuscous, with broad median chitinized suture, posterior margin 

 broadly emarginate and from its middle arise a pair of slender, bladelike 

 pi'ocesses, their basal half strongly curved upwards, apical part straight, 

 nearly horizontal; no pleural suture; upper apical appendage broad, leaf- 

 like, almost quadrate; the middle appendage apparently consisting of two 

 plates, the outer conical, horizontal and ending in a prolonged point, 

 a short rounded knob extends from near the base of the anterior margin, 

 the inner plate arises from near the base of the outer, is broad, its poste- 

 rior margin fringed with soft hair; the inferior appendage bilobed, the upper 

 part expands into a rounded knob, fringed with short hairs, the lower part 

 nearly quadrate, shorter and partially curved upon itself. The lateral 

 appendage ends in two processes, the upper broad, strongly chitinized, of 

 nearh- equal width from base to apex, the latter rounded, fuscous; the 

 lower process clawlike, chitinized, basal part rather broad with a toothlike 

 process on its lower margin; the apical part blackish, very slender, acute, 

 curved inwardly. Legs yellow, base of anterior and middle coxae, fuscous 

 anteriorly, apices of femora and tibiae, and outer tarsal joints dark fuscous. 



Wings grayish fuscous; costal and subcostal cells yellowish; stigma, a 

 spot over the praefurca, an elongate patch in second basal cell along the 

 margin of the fifth longitudinal vein and a spot in basal portion of anal 

 cell, fuscous; the space beyond the stigma is conspicuously white, the space 

 before the stigma less so; first posterior cell, except at base and ill-defined 

 median patch, whitish; discal cell, except at apex, white; fourth and fifth 

 posterior cells, basal and anal cells, more or less margined with white. 



TRANS. AM. ENT. SOC, XL. 



