LUCY WRIGHT SMITH 
451 
Distribution. — Mission, British Columbia; San Francisco, Cali- 
fornia; Dilley, Oregon; Washington. 
cf . — Length to tip of wings, 36 inm.; length of antennae, 21 mm.; length of 
setae, 7 mm.; expanse of wings, 68 mm. 
9 • — Length to tip of wings, 47 mm.; expanse of wings, 83 mm. 
Very dark brown, or black, much darker than any of the other species, 
paler around bases of appendages. Head about the width of prothorax; spots 
outside the ocellar triangle dark; supra-antennal plate narrow, posterior angle 
slightly produced. 
Prothorax wider than long, front margin and sides nearly straight, posterior 
border convex, angles sharp; median reddish-yellow line narrow, more or less 
interrupted in the middle. Venter of the thorax varied with paler. Legs dull 
blackish-brovTi; wings very dark, clouded, veins blackish-brown. 
Abdomen paler brown, blackish on the pleura. 
Male. The genitalia very similar to Pt. californica, the ninth ventral seg- 
ment with hollowed scars on either side, the middle area broader at the base 
than tip. The tenth segment concealed below by the ninth, bifid above, the 
lobes, erect, transverse knobs as in Pt. californica, but smaller. The sub-anal 
plates broadly triangular. The supra-anal plate modified as a sperm-conveyer, 
above it appears as a trough evenly rounded, cleft at the tip. Before the cleft 
it is prolonged ventralward, ending in a sperm-cup (fig. 7). 
Female. The entire eighth segment modified in the formation of two large, 
flat, triangular processes, the cleft between them reaching to the posterior 
margin of the segment, the opposed margins straight (in one specimen they 
appear slightly concave), outer margins oblique, or a trifle convex, the pro- 
cesses reaching across segment nine (fig. 8). 
AVe have two males, one (alcoholic) from Dilley, Oregon, and 
one (alcoholic) from California; three females from California. 
Hagen’s manuscript species, Pt. infuscata 9 , and Pt. nigra cf , ap- 
parently belong here also. Professor Needham examined the type 
specimens, and placed them together under the name Pt. nigra. 
They were apparently taken together, both bearing the same 
label, San Francisco, and they agree well in general coloration. 
His notes and sketches from the types indicate their synonomy 
with Pt. princeps. 
Type specimen of this species in the Bank’s collection in the 
Museum of Comparative Zoology, at Cambridge, Massachusetts. 
Nymph unknown. 
TRANS. AM. ENT. SOC., XLIII. 
