Pomona College; Journal of Entomology 439 



color dark orange red to dark Ijrown with a reddish tinge ; abdomen greenish 

 white; thorax often Hghter colored laterad. 



Head moderately deflexed, with eyes not as broad as thorax, very finely 

 l)unctate. Posterior margin of vertex slightly elevated narrowly, arcuate ; 

 vertex not raised plate-like ; discal area almost plane ; with a very shallow 

 and slight depression in center; anterior margin quite strongly protruding over 

 insertion of antennae, emarginate roundly at median suture ; anterior ocellus 

 under protrusion of vertex at base of facial cones. Facial cones medium in 

 length, subacute, quite strongly divergent, subvertical to subhorizontal, usually 

 not visible from above, moderately pubescent. Antenn;e normal, inserted un 

 frons at base of facial cones laterad. 



Thorax quite strongly arched, more coarsely punctate than vertex. Pro- 

 notum short, depressed below head and dorsulum ; proepimeron usually only 

 moderately visible, occasionally very prominent. Dorsulum strongly ascending, 

 roundly acute cephalad. Scutum quite broad. Metasternal spurs small. 

 IVings hyaline, almost two and one-half times as long as broad, broadest across 

 first marginal cell, subacute to roundly acute apically, usually the latter ; radius 

 as long as second cubital ; radial cell very slender throughout ; marginal cells 

 subequal, the second a trifle larger ; anal angle usually concolorous with the rest 

 of marginal veins, some times dark brown. 



Male. — Abdomen more slender than that of female ; flexible at fourth and 

 fifth ventral sclcrites. Genital plate not large; ventral plate normally rounded 

 caudad and horizontal dorsad ; claspers quite long, slender, acute, simple ; 

 anal valve rather small, extending scarcely to base of claspers ; composed of 

 two simple elliptical flaps, with a row of hairs dorsally. Pubescence sparse 

 and brief. Female. — Genital segment moderately large, longer than preceding 

 ventral sclerite ; dorsal plate longer and less acute than ventral ; genital pore 

 inclined toward anal tergite ; pubescence sparse. 



Described from numerous males and females collected by C. F. Baker in 

 Santa Clara County, California, and three specimens in Ormsby County, 

 Nevada. 



This species is quite closely related to T. aurantiaca and T. fulvida Craw- 

 ford. As was noted in T. aurantiaca there is in this species more or less 

 gradual variation in the characters mentioned as variable in the foregoing 

 description. Among all the specimens studied, three males were found to have 

 a slightly more acute wing and a black anal angle, the two characters seem- 

 ing to be associated. 



Trioza mexicana n. sp. 

 (Fig. 152, I; 153, P; 154, G; 155, H) 



Peng^h of body (female) 2.6 mm.; length of forewing 3.6 mm.; greatest 

 width 1.5 mm.; width of vertex between eyes .52 mm.; with eyes .87 mm. 

 General color reddish brown, usually quite dark, occasionally lighter. 



Head somewhat deflexed, with eyes not as broad as thorax, punctate. Pos- 

 terior margin of vertex arcuate, scarcely elevated ; vertex not raised plate-like, 

 finely pubescent ; discal area almost flat, with a slight foveal depression near 



