W. G. DIETZ 361 



gites somewhat paler. Eighth tergite short, brown, apical margin yellow- 

 ish. Eighth sternite brown, short, deeply incised each side, median lobe 

 relatively narrow, lobes and the margins densely covered with yellow 

 silken hair. Hypopygium rather short. Ninth tergite narrowed poste- 

 riorly, about one-half longer than wide, rounded posteriorly and transversely 

 impressed behind the posterior margin, the latter with small median emar- 

 gination and from its underside project two acute distant teeth. Ninth 

 sternite brown, emarginate posteriorly, bladelike processes slender, basal 

 part nearly straight, outer portion curved in form of a sickle; no pleural 

 suture; apical appendages smaller than usual; upper appendage narrowly 

 elongate ovate, obtusely pointed at apex; middle appendage ovate, drawn 

 out into an acute point above; lower appendage trapezoidal, circularly 

 emarginate posteriorly, the upper lobe curved downward and enlarged into 

 a ciliate knob, the lower lobe rounded and ciliate, the cilia longer, softer 

 and less regular. The lateral appendages with three processes, the upper 

 process rather broad at base, ending in two subequal, chitinized teeth; 

 the middle process broad, ovate, semichitinous, apex subacute, curved 

 inwardly; the lower process rather long, membranous and pendulous. 

 Legs: coxae and femora yellow, the. latter fuscous towards the apex; tibiae 

 yellowish fuscous, darker at apex; tarsi dark fuscous. 



Wings moderately wide, grayish subfuscous, apical partinfuscate; stigma 

 fuscous, a subfuscous cloud along anterior cross-vein; a small fuscous spot 

 over origin of praefurca and end of subcostal vein; marginal cell between 

 the origin of the praefurca and stigma white, a conspicuous white area 

 beyond the stigma extends across basal half of second submarginal and 

 first posterior cells into discal and fourth posterior cells; posterior margin 

 of outer half of first posterior cell paler; the ground color along the dividing 

 vein between the fourth and fifth posterior cells, is paler, a large white spot 

 at about two-thirds of second basal cell and two similar but much smaller 

 spots in anal cell. 



9, Length, 17.5 mm.; wing, 16 mm. 



Anterior leg: femur, 6.5 mm., tibia, 8 mm., tarsus, 10 mm. 



Antennae shorter and rather robust, the first five joints of flagellum 

 dark yellow, fuscous at the base, outer joints merging into fuscous, darker 

 at base. Mesonotal vittae less distinct, the fuscous color of the margins 

 and the middle stripe not so dark and pronounced. Abdomen yellow; 

 venter not fuscous along the middle; the dark fuscous dorsal stripe very 

 distinct and extending from second to end of seventh tergite, the pale 

 lateral margin of tergites is interruptedly edged with blackish. Ovipositor 

 short, 1.25 mm., basal part brown; valves very short, .75 mm., pale yellow, 

 bladelike; upper and lower valves of equal length. The legs are more dis- 

 tinctly yellow; femora black, tibiae infuscate, at apex. The white markings 

 of wings more in evidence, the white area in marginal cell extending broadly 

 into the first basal cell ; the outer half of the first posterior cell is not paler 

 posteriorly; the outer white spot in the anal cell is obliterated and the 

 inner spot extends well into the first axillary cell. 



TRANS. AM. ENT. SOC, XL. 



