419 



Xanthoencyrtus semiluteus n. sp. Fig. 8. 



Female : From aptenis differing structurally as follows : Head 

 nearly of the same shape but the eyes considerably smaller so that the 

 space between them from the antennal sockets to the occipital margin 

 Is only one-tenth longer than wide (by micrometer measurement), ap- 

 pearing to the eye a little wider than long, and therefore practically 

 as in scmiflavus although the space is sunken in after death as in 

 aptents; ocelli rather more minute, although more prominent by their 

 contrast in coloration with background, the posterior pair considerably 

 more remote from the eye-margins than their distance apart; antennae 

 nearly as in sanguineus^ Thorax nearly as in aptenis, the posterior 

 margin of pronotum more gently arcuate, the mesoscutum more trans- 

 verse and somewhat over twice as wide as its median length, the scu- 

 tellum broadly rounded at apex. Abdomen conspicuously large, over 

 twice as long as head and thorax combined or rather larger and 

 longer than in aptenis, the ovipositor shortly protruded. Head, thoracic 

 notum and basal tergite of abdomen very minutely reticulate, the sur- 

 face considerably more shiny than in sanguineus but much less so than 

 in aptenis. Pubescence very fine and sparse on head and thorax and 

 not easily detected. 



Length: T.17 (with head nearly vertical); width of vertex: 0.216; 

 width of mesoscutum : 0.278 mm. 



Head and base of antennae buff yellow (R.), the antennae gradu- 

 -ally shading into piceous beginning at the middle of the funicle ; thorax 

 maize yellow (R.), the underparts paler, the mesopleura especially being 

 yellowish white ; legs nearly maize yellow but paler at base ; abdomen 

 about salmon orange (R.). 



Male : Structuraly much like the male of aptents but the eyes are 

 a little smaller, with the space between wider, the posterior pair of 

 ocelli a little more remote from the eye-margin than their distance apart ; 

 scape of antennae narrower, the sixth funicle joint with a row of about 

 five clavate hairs and the base of the club with two or three more ; 

 thorax differing as in the female ; abdomen ovate, as long as the 

 tliorax. Head very finely shagreened and opaque, tlie tliorax sculptured 

 as in tlie female, the basal tergite of abdomen more coarsely reticulate 

 tlian in the female, although somewhat more finely than in aptents: 

 thorax and abdomen botli nnich less shiny. Puliescence mucli more 

 abundant than in the female, but not contrastin',; in color with the 

 body, and rather more abundant than in tlic male of apt ems. altliough 

 less easily seen. 



Length: (0.68 to) 0.865; vvidth of vertex: 0.214: width of mesoscu- 

 tum : 0.285 mm. 



Coloration nearly tmifonnly capucine yellow (R.). the scajie and 

 pedicel about concolorous, the funicle and club black, the legs paler 

 •or about light orange yellow ( R.) : in two of tlie paratopes the color- 

 ;ation is much redder I)Ut apparently (hw to discoloration. 



