PROC. EXT. SOC. WASH., VOL. 21, NO. 4, APR., 1919 



The antennae and legs are present but minute and very greatly 

 reduced; it has not so far been possible to locate any spiracular 

 or marginal spines, although they probably occur in the species. 

 The band of multiocular disk pores running from each spiracle 

 to the margin of the body is very heavy, probably including 

 several hundred of these pores closely crowded together. 



Genus Saissetia Targ. 

 Saissetia oleae (Bern.) 



This species is represented by two lots of material, one from 

 Buenos Aires, Argentina, on Pittosporum tobira, May, 1911, with 

 collection number 8, the other from the same locality, on Nerium 

 oleander, during the same period, with collection number 5. 



Saissetia silvestrii Leon. 



There are a few specimens of what seems without question to be 

 this species in the collection from Buenos Aires, Argentina, on 

 Celtis tala, May, 1911, under collection number 24. The species 

 was originally described from Cacheuta, somewhere in the 

 subandean region of the republic from Zuccagnia punctata, and 

 with no further records of its distribution in Argentina available, 

 the evidence indicates a probable artificial introduction into 

 Buenos Aires. 



Saissetia argentina, n. sp. 



(PL 4,%. 11; pi. 7, fig. 1, A-H.) 



Adult Female. Occurring on the small twigs and branches of the host, 

 frequently closely crowded in clusters; leaving a whitish mark, formed by 

 waxy secretion when detached from the host; maximum length 2.75 mm., 

 maximum width about 2.75 mm., height 2.25 mm., strongly convex, irreg- 

 ularly hemispherical, apparently normally covered with a thin transparent 

 coating of hard wax which is very easily deciduous, leaving only a few small 

 irregular wax scales on the more prominent points on the dorsum; surface 

 of both wax and body faintly shining, smooth, body surface usually with 

 a low elongate mid-dorsal ridge, this not noticed in a few specimens and typi- 

 cally with two shallow pits on each side of the middle line on the dorsum, 

 these sometimes confluent so that there is apparently only a single elongate 

 but short, shallow groove running lengthwise on the body on each side of the 

 middle line; with a slight suggestion of a cubical form, due to the presence 

 of faint traces of broad slightly rounded ridges at the four "corners" of the 

 body, these elevations very indistinct or wanting, lateral only, not con- 

 tinued onto the dorsum; body surface in a band all around the margin faintly 

 pitted and rugose, this rather broad band occurring between the margin 

 and a lateral row of pits similar to those described as present on the dorsum, 

 but less developed and more numerous; the body shape usually more ir- 

 regular than described, in crowded specimens; body color reddish brown, 



