NORTH AMERICAN TETRASTtLCHUS BURKS 581 



Varying from dull brown to shining black, faintly iridescent; vari- 

 able areas on scape and pedicel of antennae, trochanters, apices of 

 femora, tibiae, and basal segments of tarsi yellow or white. 



Female. — Length, 0.9-1.8 mm. Antennae inserted at level of ventral 

 margins of compound eyes ; apex of scape not reaching anterior ocellus, 

 all funicle segments subequal in length and equal in width; club short, 

 globose, wider than funicle segments and as long as two funicle seg- 

 ments ; length of malar space two-thirds as great as height of compound 

 eye ; postocellar line twice as long as ocellocular line. Mesopraescutum 

 longer than wide, lacking a median groove and having one row of 

 bristles at each lateral margin, posterior pair of bristles much longer 

 than more anterior ones, as in figure 19, c; submarginal vein of fore- 

 wing with three to five dorsal bristles ; apex of hindwing blunt. Sur- 

 face of propodeum smooth or very slightly roughened anteriorly, 

 median carina only present ; spiracles almost touching anterior margin 

 of propodeum ; gaster clothed with fairly long bristles. 



Male. — Length, 0.8-1.3 mm. Antennae inserted slightly dorsad of 

 level of ventral margins of compound eyes ; funicle segments enlarged 

 near bases and bearing numerous, conspicuously long bristles, first seg- 

 ment one-half as long as second; gaster slightly shorter than thorax. 



Type locality. — Washington, D. C. 



Type. — U.S.N.M. No. 2619. (The type specimen, a male, is in 

 very poor condition; only fragments of the thorax remain. A wing 

 from this type was at one time preserved on a slide, but that slide 

 cannot be found.) 



Hosts. — Anagyrus spp. parasitic on the grape mealybug, Pseudo- 

 coccus maritimus (Ehrhorn) ; Aphycus lounsburyi (Howard) parasitic 

 on Lecanium spp. ; the cotton and melon aphid, Aphis gossypii Glover ; 

 the apple aphid, Aphis portii De Geer; Aphis spp.; Cycloneda san- 

 guinea (Linnaeus) (may be incorrect) ; the European fruit lecanium, 

 Lecanium corni Bouche; the terrapin scale, Lecanium, nigro fascia- 

 turn Pergande; the European peach scale, Lecanium persicae (Fab- 

 ricius) ; the false maple scale, Phenacoccus acericola (King) ; Phen- 

 acoccus helianthi Cockerell; Physokermes insignicola (Craw); Pul- 

 vinaria bigeloviae Cockerell ; the black scale, Saissetia oleae (Bernard) . 



Distribution. — Occurs over most of the United States, especially 

 in the Southeast and on the Pacific coast; specimens from South 

 Africa can, also, be placed under this name. 



Remarks. — It is possible that this species is always a hyperpara- 

 site. It is very likely that the species will eventually be shown to- 

 be very widely distributed over the world and have a lengthy 

 synonymy. 



