1908] OIRAULT — ENCARSIA VERSICOLOR 55 



of the marginal vein also arises another row of about 7 bristles. Stigmal vein in- 

 definite, sometimes apparently entirely absent, but in reality short or sessile, near the 

 costal margin, paler, and with a hook-like termination. Basal half of forewing 

 slightly dusky, especially that portion of its surface bounded by the marginal vein; 

 a more or less round, conspicuous, naked area just below and beyond the stigmal 

 vein, reaching the costal edge, but not invading the caudal half of the wing; also a 

 more or less distinct bare path around the margin of the apical half of the wing, 

 from the naked area in the stigmal region around to a point on the caudal margin of 

 the wing just opposite to it, appearing as if the second row of cilia was absent. Bristles 

 or fringes of forewing long, especially on the caudo-apical aspect. Forewing moder- 

 ately ciliated; opalescent. 



Marginal vein of hind wing longer than submarginal, and bearing from 7 to 8 

 bristles along its edge, and 2 shorter ones at its junction with the submarginal; the 

 interior of the wing bears two main rows of cilia, one near the costal edge, and the 

 other following the caudal margin but farther from it. A portion of a third, and 

 perhaps a fourth, present between the two in the basal half of the wing. Costal 

 fringes short. 



From ventral aspect, the cheeks have two furrows, converging towards the oral 

 opening, and originating from opposite ventro-lateral margins of the eye. Ventum 

 uniformly concolorous, the cox^e and trochanters paler; labrum dark. Ovipositor 

 not exserted, included within the slightly projecting valves; in balsam mounts, 

 however, generally free for its entire length, but not reaching beyond the tip of the 

 abdomen. Mandibles minute, apical half fuscous, blunt, and with three sinuations 

 or obtuse and delicate teeth at apex. 



[Described from 77 specimens.] 



Male: — Length, 0.50-0.58 mm.; av. length, 0.546 mm.; expanse, excluding 

 cilia, 1.090 mm.; width of forewing, 0.145 mm.; length of forewing, 0.491 mm.; 

 length of head (dorsal aspect), 0.091 mm.; thorax, 0.199 mm.; abdomen, 0.219 mm.; 

 length of genitalia, exserted, 0.109 mm. 



Differs markedly from the female in color, the dusky areas of the body present 

 in the latter, piceous black or nearly so in the former, with the exception of the general 

 color of the wings. 



Tlie triangular area on mesoscutum, barely duller or slightly dusky in the 

 female, black in the male, the triangular area of the ocelli black, most of the abdomen, 

 excepting extreme apex, black, including the ventum, the antennae dusky, the coxae 

 and femora marked with dusky; most of the metapleura black; cheeks and axillae 

 black; marginal and submarginal veins darker; thoracic venter more or less duskv. 



