44 The West American Scientist. 



adult female, however, have nine joints, instead of only eight; 

 and the species therefore belongs to the allied genus Pseudococcus. 

 I append herewith a description of this species. 



Pseudococcus yuccae n. sp. Adult female pale greenish, thinly 

 covered with a white mealy powder not concealing the ground color; 

 body elongate-ellipsoidal, the posterior end deeply emargiriate; 

 margins bearing a row of flattened white cottony tufts, the two 

 anal dnes not exceeding one-third length ol body; legs blackish-' 

 brown, the articulations whitish; antennae dark brown, apex of 

 each joint except the last one whitish; antennae slenderest in the 

 middle, nine- jointed; joint 3 is the longest, and is nearly twice as 

 long as 2; joint 9 is next in length, and is one-fifth longer than 8; 

 joints 4, 5, 6, 7 and 8 becoming successively slightly shorter, but 

 the difference in length between 4 and 8 is scarcely perceptible; 

 joints 1 and 2 sub-equel in length and shorter than either of the 

 others; joint 1 is more robust than the others, and is as broad as 

 long, being considerably broadest at its base; joint 2 is twice as 

 long as broad; when laid backward, the last two antennal joints 

 project beyond the posterior side of the front coxae; tarsi one-third 

 as long as the tibiae, the claw bearing a distinct tooth on the under- 

 side beyond the middle; digitules not knobbed; on the underside 

 of the second abdominal segment is a dark colored transverse 

 ridge about equaling the tarsi in length; length of body 6 m. m. 



Lives on the leaves of Yucca whipplei. At the time of my 

 visit, July 5th, none of the females had secreted a cottony egg-sac, 

 nor did I succeed in obtaining either the eggs or the young larvae 

 of this species. From one ot the adult females I bred an inter* 

 esting Chalcid-fly, and as it clearly represents a new species and 

 is so characteristically marked as to be readily recognized, I ap- 

 pend a description of it herewith. 



Blastothrix yuccae n. sp. Female. Antennae evenly clothed 

 with short depressed hairs; scape compressed, and greatly dilated 

 below, its greatest width about equaling three-fourths its length-, 

 six or seven times as wide as the pedicel; the latter is twice as 

 long as broad, and is slightly shorter than the first funicle joint; 

 funicle joints decreasing considerably in length and increasing 

 slightly in thickness towards the apex, the sixth funicle joint but 

 slightly longer than thick, about two-thirds as long as the first 

 funicle joint; club three times as long as last funicle joint and 

 much more robust, the apex bluntly rounded; thorax luster- 

 less, coarsely punctured and clothed with depressed coarse 

 white bristles; apex of mesoscutellum, bearing eight long black 

 bristles; abdomen quite coarsely punctured and clothed 

 with stout depressed white bristles; curved front tibial spine 

 bifid at the tip; wings hyaline, marginal vein two-thirds as 

 long as the stigmal, but slightly longer than the postmarginal; 

 end of stigmal vein bilobed, but destitute -of the usual tooth pro- 

 jecting toward the costa; near the base of the stigmal vein is a 

 large oblique hairless space; submarginal vein bearing a row of 

 stout bristles; color black, each end of scape apex of pedicel, 



