404 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.51. 



abundant in the collections, being represented by 25 lots of material 

 from different parts of the Americas. Two lots — one from Jamaica 

 and one from Mexico — show a median dark brown stripe more or 

 less developed. One collection from Brazil, of which the host is 

 unknown, is remarkable in that the thorax of all the pupa cases is 

 yellow, whereas the abdomen is uniform dark browm. This phase is 

 very striking and so far has not been met with in any of the other 

 collections. A fourth phase, and a fairly common one, has the 

 dorsal disk dark brown and the submarginal area, together with the 

 marginal tubes, yellow. It has been received from Florida, Brazil, 

 and Costa Rica. Still another phase has the entire dorsum brown 

 with the exception of the margmal tubes, which are yellow. This 

 has been received from Argentina and Paraguay. 



A. jioccosus is common in the islands of the West Indies and occurs 

 also in Florida, Mexico, British Guiana, Brazil, Argentina, Canal 

 Zone, Chile, and Paraguay. In addition to the orange, lime, grape- 

 fruit, etc., Jioccosus has been taken on the sea grape (Coccolola 

 uvifera), Plumeria species, Baccharis genistelloides, guava, a coarse 

 grass, and a climbing vine. 



ALEUROTHRIXUS (ALEUROTHREXUS) HOWARDI (Quaintance). 



Plate 62, figs. 12, 13. 



Aleyrodes hoivardi Quaintance, Tech. Ser. 12, Bur. Ent., U. S. Dept. Agric, 1907, 



p. 9. 

 Aleurothrixus hoivardi Quaintance and Baker, Journ. Agric. Research, vol. G, 



1916 p. 466. 



This species occurs upon the same hosts and in the same regions 

 as jioccosus. It was first recorded for the United States by Prof. 

 P. H. Rolfs, September 25, 1900, at Miami, Fla., on sea grape. 



Type— Cut. No. 10823, U.S.N.M. 



aleurothrixus (ALEUROTHRIXUS) PORTERI Quaintance and Baker. 



Plate 62, figs. 8, 11. 



Aleurothrixus porteri Quaintance and Baker, Journ. Agric. Research, vol. 6, 

 1916, p. 466, fig. 3. 



This species has been treated by the writers in their recent paper 

 on the white flies attacking citrus plants. It is a common species in 

 Chile. 



Type.— C&t. No. 20190, U.S.N.M. 



Philodamus, new subgenus. 



Pupa case with margins usually not angled; margin vathout an 

 apparent double row of wax pores or teeth, but with a single row. 



Type. — Aleurothrixus {Pliilodam.us) interrogationis (Bemis). 



