448 Pomona College Journal of Entomology 



The cephalic and thoracic color markings are quite characteristic and con- 

 stant. There is a variation, however, in the discal macula of the vertex. In 

 some specimens this macula extends arcuately to the post-ocelli, and is quite 

 broad, while in others it is narrow and does not attain to the post-ocelli. In 

 some individuals it even tends to disappear entirely. Although the variation 

 is gradual and quite complete, it seems advisable to separate as a variety those 

 forms in which the macula is scarcely present or entirely wanting. 



The cephalic markings are quite uniformly of a white or flavous white 



color. In a few individuals this varies toward flavous rather than white. A 



second variety seems to e.xist in which the cephalic markings are distinctly 



flavous. The thoracic markings vary widely from white to dull dirty yellow. 



Paratrioza ocellata nigra n. var. 



General characters same as for species. Discal area of vertex without 

 macula or stripe. 



Paratrioza ocellata flava n. var. 

 General characters as for species. Cephalic markings dark flavous. Thoracic 

 markings lighter flavous. 



Paratrioza cockerelli (Sulc.) 



(Trioca cockerelli Sulc.) 



(Fig. 153, S; 155, L) 



Length of body 1.3 mm.; length of forewing 2.6 mm.; greatest width 1.0 

 mm. ; width of vertex between eyes .39 mm. ; with eyes .60 mm. General color 

 light brown to brown, as seen with the naked eye ; vertex colored very similarly 

 to P. ocellata but less markedly so ; thorax not so distinctly striped as 

 P. ocellata. 



Head deflexed, with eyes not as broad as thorax, very finely punctate. 

 Vertex raised plate-like, pubescent ; discal area with a small foveal impression 

 posteriorly on each side of the median suture ; emarginate on aterior margin 

 above insertion of antennse; scarcely emarginate at median suture; anterior 

 ocellus under projecting vertex. Facial cones very small, subacute when viewed 

 from in front, scarcely visible from side ; projecting outward from face over 

 insertion of antennje; labrum prniuinent ; antenna inserted on frons more 

 nearly in front than in P. ocellata. 



Thorax arched, punctate. Pronotum arched, depressed below dorsuluni ami 

 iiead slightly; prcepimeron mostly concealed. Dorsulum small, subacute 

 cephalad. Wings hyaline, small, a little more than two and a half times as 

 long as broad, broadest across first marginal cell ; radius about as long as 

 second cubital ; marginal cells subequal. 



Male. — Genital segment rather small ; claspers long, arcuate, obtuse at apex ; 

 anal valve long, straight on anterior luargin, with a posterior, triangular lobe 

 projecting from almost entire vertical length ; vertical axis shorter than hori- 

 zontal axis from tip of jjosterior lobe to center of anterior vertical margin. 

 Pubescence sparse. Female. — Genital segment very similar to that of P. 

 ocellata; ventral plate relatively a little larger. 



