1908] ■ GIRAULT — ENCARSIA VERSICOLOR 53 



ENCARSIA VERSICOLOR SPECIES NOVUM, AN EULOPHID PARA- 

 SITE OF THE GREENHOUSE WHITEFLY, A LEY ROD ES 

 VAPORARIORUM WESTWOOD. 



BY A. ARSEXE GIRAULT, OFFICE OF THE STATE ENTOMOLOGIST, URBANA, ILLINOIS. 



Female: — Length, 0.62-0.69 mm.; av. length, 0.6545 mm.; expanse, exchid- 

 ing cilia, 1.309 mm.; width of fore wing, 0.145 mm.; length of fore wing, 0.545 mm.; 

 length of head (dorsal aspect), 0.109 mm.; thorax, 0.273 mm.; abdomen, 0.273 mm.; 

 length of ovipositor, balsam mounts, 0.145 ram. 



General color pale cadmium yellowy marked with variable dusky. Cephalic 

 sides of thorax, mesopleura, metapleura, tips of scape, base of pedicel, and occipital 

 region at apex of the neck with more or less dusky; apical joint of antennae sometimes 

 dusky. Basal two-thirds of dorsum of abdomen, tegulse, and cephalic half of axillae, 

 dusky, in the former case usually deeper on the two proximal segments and especially 

 at the meson, forming two (2) more or less rounded spots; incisions of abdominal 

 segments dorsad paler. A discal inverted triangular area with concave sides, in the 

 mesocutum, slightly duller in color; this becomes wholly black in the male. Eyes 

 blue green, apparently with a conspicuous central dark spot from lateral aspect, 

 but which varies in position with the aspect, always appearing in the plane of the 

 perpendicular; from latero-dorsal aspect, apparently two, one in the center of the 

 eye and one at its dorsal apex. Eyes prominent, rounded, and rather coarse, and 

 with moderately abundant short hairs. Caudal edge of mesoscutum, between the 

 bases of the parapsidal furrows, black or darkened, straight or very slightly convex. 

 Ocelli in a small isosceles triangle on the dorsal aspect of the vertex, somewhat nearer 

 the occipital margin, the lateral ones farther from the margin of the eyes on each 

 side than from each other, and the distance between them is at least twice greater 

 than the distance between either and the apical (cephalic) ocellus; the ocellar triangle 

 margined outwardly by two converging sutures meeting just cephalad of the apical 

 ocellus; medio-cephalic portion of the cephalic ocellus concolorous with body, the 

 caudal border margined with ruby red; the latero-caudal portions of the two caudal 

 ocelli concolorous, the cephalic borders margined with ruby red; the ocelli therefore 

 are ruby red and pale cadmium yellow. 



At the caudal margin of the vertex, beginning slightly caudo-mesad of each 

 lateral ocellus, at the occipital margin, and slightly obliqued latero-cephalad toward 

 the apical margin of each eye, is a conspicuous dusky or darkened carina, one on each 



