PEECOPTERA OE NORTH AMERICA 93 



anal area of the hind wing is broader and the median 

 vein has fewer branches. 



Distribution. — Oregon Caves, Josephine Co., Ore., July 

 23, 1922 (E. C. VanDyke). 



Female holotype in the California Academy of Sciences. 



This may possibly be the female of the following 

 species P. vcnosa, but the relative size of the sexes does 

 not indicate this. 



Perla venosa, new species. 



(Plate 11, fig. 8; plate 18, figs. 11, 12.) 



Length to tip of wings, 20 mm. ; expanse, 35 mm. 



Color brown with a very broad yellow middorsal stripe. 

 Head brown at the sides deepening and connected across 

 the middle ocellus ; broadly yellow in front on labrum and 

 clypeus and with a small inverted mushroom-shaped spot 

 in the brown before the middle ocellus. Space between 

 the ocelli wholly yellow, continuous and wider to rear- 

 ward, and continuous with the broad stripe upon the pro- 

 thorax. Antennae and palpi yellowish brown. Eyes and 

 ocelli very small, the rear ocelli a little nearer to each 

 other than to the eyes. Hind angles of the head behind 

 the eyes rather prominent. 



Prothorax hardly broader than long, sharp angled. The 

 middorsal yellow stripe covers a third of its entire width ; 

 the edges of the stripe are parallel but ill-defined. Em- 

 bossed markings subob'solete, limited to a few obscure, ill- 

 defined oblique streakings. Legs brown with a dorsal 

 half ring of bright yellow just before the knees. Wings 

 flavescent-hyaline with brown veins. The apex of the 

 wing (portion beyond the cord) long and vein tips un- 

 usually numerous, especially the branches of the median 

 vein. 



Abdomen brown ; tails paler. 



Male. Abdominal segments normal to the 7th. Ster- 

 num of segment 7 emarginate at sides and extended 

 apically into a scoop-like lobe ; margin pilose. Sternum 

 of 8 similar, less extended but more pilose ; sternum of 9 

 much more extended, its ventral length being 3 times the 

 dorsal, and obliquely truncate apically from above down- 

 ward, a very little angulate and upcurved on the mid- 

 ventral line, pale on the scoop-like portion and pilose ex- 

 ternally. Segment 10 included ventrally in 9, cleft above, 

 and the edges of the cleft are laterally divided in a 

 rounded notch between two similarly rounded angles that 

 lie flat on the back ; between the four lobes thus formed 



