68 PROC. ENT. soc. WASH., VOL. 21, NO. 4, APR., 1919 



plates, judging from an examination of Green's figures and a study 

 of this, the only other species at present included in the genus. 



Genus Eriococcus Targ. 



This genus is represented in the collection at hand by four 

 species, of which three appear to be undescribed, while the speci- 

 mens of the fourth have been referred to a species already de- 

 scribed from South America, although there are some variations 

 in the material from what appear to be typical specimens of the 

 species in question. 



So far as the writer knows, there are at present four described 

 species of the genus Eriococcus reported from South America. 

 Three of these, together with the three new species are included 

 in the following key. Eriococcus parcispinosus Leon. (Bol. Lab. 

 Zool. gen. e agr. R. Scuola sup. d'Agr. Portici, vol. V, 1911, p. 

 248, fig. VII) is obviously a species of the genus Erium, as it is at 

 present recognized, which will be discussed later in connection 

 with Erium armatum (Hemp.) Eriococcus diversispinus Leon. 

 (Bol. Lab. Zool. gen. e agr. R. Scuola sup. d'Agr. Portici, vol. \ , 

 1911, p. 249, fig. VIII) is not included in the following key to the 

 species of the genus since it is known to the writer only from the 

 original description. Assuming that Leonardos description and 

 figures are completely accurate in such details, it may be readily 

 separated from the other known South American species by the 

 presence of only a pair of spines on each margin of each abdominal 

 segment and by the relatively small size of the anal lobe spines. 

 Such structures as the pores of the hind coxae and femora and the 

 cup-shaped body glands which are mentioned in the following 

 key and descriptions can be studied satisfactorily only in stained 

 specimens. 



Key to South American Species of Rriococciis. 



a . Abdominal body spines confined to the margins of the segments, two 

 large and one small, stout, blunt-tipped spines occurring on each 

 margin of each abdominal segment; anal lobe spines stout, blunt- 

 tipped araucariae Mask. 



aa . Abdominal body spines varying in number but always present on the 

 dorsum, all spines slender, nearly sharp-pointed at apex ; anal lobe 

 spines elongate, slender. 

 b . Dorsal body spines small, distinctly smaller than the largest marginal 



spines, not very numerous nor conspicuous. 



c . Subapical hair of anal lobes longer than largest anal ring hair; apical 

 hair of anal lobes more than twice as long as anal ring hair 



mendnzae n. sp. 



cc . Subapical hair of anal lobes a little shorter than longest anal ring hair; 

 apical hair about twice as long as anal ring hair leguminicola n. sp. 



