The Peak Tree Psylla. 



253 



stripe. The scutellum of the mesothorax is broadest cephalad 

 and slightly smaller than the praescutum; color, crimson with a 

 whitish curved tooth projecting cephalad from the lateral angles. 

 The postscutellum of the mesothorax is barely visible on the 

 meson but is quite distinct each side the scutellum ; color, brownish 

 red. The scutum of the metathorax which bears the hind wings 

 is narrow meseally but nearly ais wide as the iscutum of the meso- 

 thorax laterally; color crimson mesally merging into black at 

 the sides. The scutellum of the metathorax is nearly round,, 

 slightly raised, and light crimson in color. Beneaith, the thorax 

 is marked with large iri'egular black spots. The legs are of a 

 light yellowish brown color, except the thickened femurs which 

 are black; all of the legs are thickly set with short hairs and the 

 tibiae and first tarsal joints of the hind legs are armed at theii? 

 distal ends with densely black short spurs, five upon each tibia, 

 three being set very close together on the under side, and two on 

 each tarsal joint; the hind coxae are the largest and have a long 



Figure 8. - Venation of wings; s, stigma: c, clavus; c, s, claval suture. 



spur projecting caudad against the abdomen and which aids the 

 insect in leaping., The relative size and shape, and the venation 

 of the wings are shown in Fig. 8; the hair line beneath the front 

 wing represents the natural size of the wing. The front wings 

 have a slight yellowish cast which partially obscures their 

 transparency; in some specimens there are also yellowish shades 

 in the cells. The hind wings are transparent and more delicate 

 than the thicker, firmer front ones. The very strong veins of 

 the front wings are always of a light yellowish brown color and 

 are pro\ided with short hairs on each side throughout their 

 length; the stigma (Fig. 8, s) is usually but a little lighter in • 

 color than the veins; the tip of the clavus (Fig. 8, c) is brownish 



