W. G. DIETZ 357 



Thorax : Collare pale yellow, edged with fuscous anteriorly and a fuscous 

 spot in the middle. Mesonotum yellowish brown, anterior margin to pleura 

 dark brown; stripes concolorous, the laterals incompletely margined with 

 fuscous, the median stripe narrowly margined externally with fuscous, a 

 short line anteriorly each side of median line does not reach the anterior 

 margin, interstices between the vittae a trifle paler with a row of pale 

 hairs; behind the suture are two larger median and two smaller lateral, 

 ring-like fuscous spots. Scutellum yellowish fuscous. Metanotum grayish 

 fuscous with abbreviated fuscous median line and a darker patch each side. 

 Pleura sordid yellow, whitish poUinose; a conspicuous dark brown stripe 

 extends from the neck to the mesosternal suture, widening and somewhat 

 paler posteriorly. Halteres fuscous, pale at base. 



Abdomen: Venter yellowish fuscous; tergiim a trifle darker, dorsal and 

 lateral stripes inconspicuous, the lateral very narrow, more or less inter- 

 rupted by the pale posterior margin of the segments, a short transverse 

 fuscous line each side behind the anterior margin of tergites 2 to 4. Eighth 

 sternite reddish brown, darker about the middle; incisions about two-fifths 

 the visible length of the sternite, lobes fringed and beset with golden yellow 

 hair. Ninth tergite brown, markedly narrowed posteriorly, apical margin 

 rounded and slightly emarginate each side and impressed above, a short, 

 downward directed process from the middle of its under margin ending in 

 two divergent teeth. Ninth sternite yellowish brown, with moderately 

 wide, chitinized median suture; posterior margin emarginate, from its 

 middle arise two bladelike processes, nearly straight with a very deep 

 emargination near the base posteriorly. Apical appendages very similar 

 to those of doanci, except that the fringe of the inner plate of the middle 

 appendage is much longer; the upper portion of the lower appendage is 

 more conspicuously prolonged. Lateral appendages with three processes, 

 the latter, excepting the first, membranous; this appendage consists of 

 two laminae, converging posteriorly and forming the middle process, which 

 is acutely triangular, pointed, at the upper margin of the inner plate is the 

 upper chitinized process, rather broad, of medium length, slightly widened 

 and blackish at the apex; between the two laminae is a connecting some- 

 what corrugated membrane; lower process pendulous, undulated, of mod- 

 erate length. Coxae yellow, anterior fuscous at base anteriorly. Legs 

 yellow, apices of femora and tibiae and outer tarsal joints fuscous. 



Wings grayish, subfuscous towards the apex, costal, and subcostal cells 

 and stigma yellowish, a fuscous spot at each end of the stigma; a similar 

 spot over origin of praefurca; a subfuscous cloud across bases of first sub- 

 marginal and first posterior cells, a subfuscous line in second basal cell be- 

 yond its middle and along the fifth longitudinal vein, the distal section 

 of the latter and its end branches faintly margined with fuscous; a large 

 white space beyond the stigma extends across basal half of second sub- 

 marginal and first posterior cells into the discal cell; outer part of first and 

 second and third posterior cells not at all white; the whitish space before 

 the stigma not distinctly limited, extending diffusely into the first basal 



TRANS. AM. ENT. SOC, XL. 



