THE JUMPING PLANT-LICE OR PSYLLID^E OF THE NEW WOELD. 85 



acute, divergent, two-thirds or fully as long as vertex, slightly 

 pubescent. Antennae about one and a half times as long as width of 

 head, segment III thicker than succeeding segments. 



Thorax strongly arched, punctate. Hind tibiae with three apical 

 spines on inner side. Wings about two and a half to two and two- 

 thirds times as long as broad, narrowly rounded to subacute at apex; 

 Rs usually rather short. 



Genitalia. — Male. — Genital segment very large; anal valve very 

 large, produced caudad into a large, broad flap on each side; much 

 broader at apex than at base; apical margin concave, with a fringe 

 of long hairs; with a ridged rib extending into posterior lobe as well 

 as axis. Forceps large, clavate, arcuate inward, apex coarsely 

 toothed or serrated. Female. — Genital segment almost as long as 

 rest of abdomen, acute, dorsal valve longer than ventral, apex 

 slender. 



Described from several specimens from Colorado (no data) ; sixteen 

 males and females from Placer Count}^, California (Koebele), on 

 Amelanchier alnifolia NuttaU, September 24-30, 18S5. These latter 

 are very similar to ohtusa Patch, a species found on another species of 

 Amelancliier in Maine. 



r?/pe.— Cat. No. 18085, U. S. Nat. Mus. 



TRIOZA FRONTALIS SULCATA Crawlord. 



Trioza sulcata Crawford '10a: 233. 



Trioza frontalis sulcata Crawford '11a: 436. 



The differences between the varietal form and the species are slight. 

 Coloration depends on the age of the individual largely, and perhaps 

 this may account for the difference between them. Color dark 

 reddish brown. Prsescutum distmctly less arched than in species; 

 notum finely and inconspicuously pubescent. 



Described from several specimens from Colorado (no data). 



TRIOZA OBTUSA Patch. 

 Trioza ohtusa Patch '11: 18. 



Length of body 2.1 mm.; length of forewing 2.6 to 3.1; width of 

 head 0.77. General color reddish brown; newly emerged individuals 

 pale green, older ones light reddish to dark, wings often dark and 

 smoky; vertex often covered with a white powdery substance. 



Very similar and closely related to frontalis, differing as follows : 

 Body usually larger, head and thorax relatively distinctly broader, 

 especially the head; vertex finely pubescent, a little more bulging in 

 front; genal cones thicker at base, relatively shorter. Antennae only 

 about one and a fourth times as long as width of head, segment III 

 sometimes thickened, often not. Thorax strongly arched, sometimes 

 very finely pubescent. Wings large, often smoky; Rs very long, 

 reaching nearly to apex of wing. 



