328 Annals Entomological Society of America IWole Wis 
the posterior face abruptly truncate and somewhat concave; tegulz 
ferruginous. Wings hyaline, slightly dusky on the broad apical mar- 
gins, and with a slight violaceous reflection; the costa yellowish, espe- 
cially about the marginal and submarginal cells, and beyond the former 
a blackish streak extending to the tip of the wing; nervures fuscous. 
Legs ferruginous, with yellowish pubescence. Abdomen obscure fer- 
ruginous, punctured, shining, iridescent, clothed with yellowish pubes- 
cence, more dense on the apical margins of the segments; basal segment 
rounded at base and more closely punctured than the following seg- 
ments, the apical margin slightly contracted; third segment with a 
large, transverse, yellow macula on each side, and the apex, of the 
fourth segment is narrowly margined with yellowish; in one specimen 
the spots on the third segment are very large, while the two basal 
segments have a small obsolete, luteous stain on each side at base, and 
the fourth segment has an angular yellow mark on each side; the base 
of the third, fourth, and fifth segments are sometimes more or less black- 
ish; the apical segment is armed at tip with three long acute spines, the 
central one the longest; ventral segments ferruginous, with their base 
more or less blackish. Length 6—6% lines; expanse of wings 11—11% 
lines. 
‘Two specimens. This species has some resemblance to S. dubia 
Say, in the markings of the third abdominal segment, but is otherwise 
very distinct.” 
There are two specimens in the collection at Philadelphia both 
marked types. The writer has examined both and has one before him 
marked type number 568-2 which varies a little from the above descrip- 
tion. The yellow mark in front of the eyes starts well within the emar- 
gination, is quite broad and extends downward along the lower lobe of 
the eye. There is a narrow yellow streak behind the eyes. The 
antenne are slightly ferruginous beneath. The body color of the thorax 
is black but all the sclerites have a marked tendency to be tinged with 
ferruginous. The pronotum has two large triangular spots which are 
joined together in front by a narrow darker band and extend back to 
the tegula. The postscutellum has a broad yellow band and the 
tegule are light ferruginous almost flavous. The median or last seg- 
ment of the thorax, has a ferruginous spot on the dorsal surface of each 
side lobe and on its central part a slight tinge of the same color. The 
wings are subhyaline with a stained area along the costal border. The 
costal, end of the media, stigmal, first cubital and radial cells with a 
small portion just beyond the radial are light yellow and covered with 
short yellow hair. The area from just beyond the radial to near the 
end of the wings is slightly smoky and gives a light purplish metallic 
reflection at some angles. The nervures are light ferruginous or flavous. 
The base of each segment of the abdomen has a black band and there 
