80 THOMAS SAY FOUNDATION 



Head yellow entirely across both front and rear, the yel- 

 low of the occiput sending a lobe forward to the middle 

 of the ocellar triangle. The brown is restricted to a broadly 

 X-shaped mark covering rearward the ocelli and frontal 

 tubercles, and forward the middle half of the M-mark of 

 the frons. Between the hind ocelli and the eyes is a 

 fainter wash of brown. Antennae and palpi pale brown, 

 the palpi the darker brown. 



Prothorax one-half wider than long, rectangular with 

 parallel sides a little convex, and angles somewhat ob- 

 tuse. Outside the lateral margin is a linear flat vertical 

 declivous area. The yellow middorsal line is narrowest at 

 the foremost of the bosses (between a pair of opposed 7- 

 shaped ones) and is very wide behind. Bosses few and 

 covering less than half the sides: the innermost line of 

 them running rearward from the 7s is bordered externally 

 by a series of broader irregular bosses and a single pair 

 of curved bosses lies farther out toward the sides. The 

 middorsal pale stripe is continued, first narrowly and then 

 broadly upon the mesosternum, with extensive mottling 

 over the remainder of the thorax, and with large fuscous 

 spots at the sides of meso and metathorax beneath. Legs 

 yellowish, brownish on the carinae, and blackish on the 

 tarsi. Wings, subhyaline with rather heavy brown 

 veins. There is a faint wash of fulvous along the stigma, 

 and a heavier one along the costal space before the 

 humeral crossveins. Between the latter and the tip of 

 subcosta there are only two or three costal crossveins. 



Abdomen brown with the two apical segments yellow. 

 Tails brown with a few of the very short basal segments 

 yellow. The tails are stouter and their hair coat shorter 

 than in P. varians. 



Male. The abdominal segments are normal to the 9th 

 which is but little produced on the ventral side and mod- 

 erately shortened dorsally. Segment 10 is deeply and 

 widely cleft on the middorsal line, and the hind angles 

 beside the cleft are produced into long recurved genital 

 hooks that are linear, regularly curving and thinly clad 

 with soft hair externally. The supra-anal process bears 

 at its tip a linear, regularly arcuate, decurved process 

 rounded on the downward end, and the paragenital plates 

 beside its base appear to end in bluntly rounded edges, 

 without angulation. 



Female. Subgenital plate similar to that of P. postica 

 but shorter, and with a minute median notch in its well 

 chitinized tip. 



