Baker & rióles.— thk aleyrüdid.e of south america 643 



abouf half filling the orífice; lingula spatulate, the distal 

 extremity exposed caudal of operculum, lobed, and usually 

 armed Avith two prorainent spines. 



Adiilt usually with oue flexure in radial sector of 

 forewing and no trace of media excepting in freshly emer- 

 ged specimens. Antennae of seven segments, Segment III 

 the longest, IV to VI subequal; segments imbricated. 

 Sexes nearly equal in size. 



Type. — Alevrodes pergandei Quaintance. 



Key to the species of the r/enus Trialeurodes 



I. Pupa case Avith a row of setaem esad of the 



margin and arouud the entire dorsum... shaivimdus 

 Pupa case without a row of setae mesad of the 



margin and around the entire dorsum.... 2 



II. Pupa case with varying number of large 



papillae on dorsum near the mesón vaporar loriim 



Pupa case lacking papillae, other than those 



mesad of the margin imadiitiis 



Trialeurodes unadutiis, n. sp. 



It is with somo hesitancy íhat we place this forra in 

 the genus Trialeurodes. The closeness of the papillae of 

 the pupa case to each other and tlieir nearness to the 

 margin give them the appearance of marginal teeth but a 

 study of the early stages resul^ed in placing tho species 

 here. We ha ve only one collection and this was taken on 

 Drim//s Winteri, by Prof. C. E. Porter, February 1913, 

 in Prov. Malleco (Chile). 



Early stage. Size 0.45 mra. long, 0.5G mm. Avide; co- 

 lor, light yellow. Margin entire, sub-marginal papillae 

 closely set together and projecting to the margin, bluntly 

 rounded at apex. Vasiform orifice sub-cordate, cephalic 

 margin straight, the caudal portion of the orifice crossed 

 Avith many reticulate lines, operculum sub-cordate, filling 

 one-half of the orifice; lingula not visible, two long setae 

 at caudal margin of the case. 



Pupa case. Lám. LXXIV, Fig. D. Size, 1.44 mra. in 

 length, 0.84 rara, in A\idth; color bright yellow. Margin 



