412 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 51. 



with several longitudinal rows; length 0.48 mm. Proximal segment 

 of hind tarsus armed with two longitudinal rows of spines, one com- 

 posed of four spines and one of five spines. Other smaller hairs are 

 present and a thicker spine is present on, its distal extremity; length 

 0.16 mm. Distal segment armed with four spines; length 0.042 mm. 

 Foot (pi. 63, fig. 12) with a central hairy paronychium and short curved 

 claws. Antennae of seven segments (pi. 63, fig. 10). Segment II 

 subpyriform, 0.06 mm. long, armed on its distal extremity with three 

 or four prominent spines and numerous smaller hairs. Segment III 

 subcylindric, tapering proximad and distad; the proximal half pos- 

 sesses imbrications, the distal half has usually six prominent trans- 

 verse annular sensoria, and one distal circular fringed sensorium; 

 length 0.114 mm. Segment IV 0.042 mm., subcylindric and armed 

 with three or four transverse sensoria. Segment V 0.045 mm., sub- 

 cylindric, and with usually four transverse sensoria. These are very 

 fine and not prominent, as upon the other segments. Segment VI 

 0.054 mm., subcylindric, with four rather prominent transverse 

 sensoria. Segment VII 0.06 mm,, subcyhndric, rather narrower 

 than the other segments and armed with three or four transverse 

 sensoria and two or three minute circular fringed ones; distal ex 

 tremity tipped with a prominent bristle. 



Adult male. — Similar to the female in general appearance, but 

 smaller. Length from vertex to tip of claspers 1.28 mm. Antennae 

 similar to those of the female. Segment II 0.054 mm.; Ill 0.111 

 mm., with usually six transverse sensoria; IV 0.045 mm., with about 

 four transverse sensoria; segment V 0.045 mm., with three or four 

 transverse sensoria; segment VI 0.051 mm., with five or six transverse 

 sensoria; segment VII 0.06 mm,, with four or five sensoria. Hind 

 tibia 0.368 mm. long; hind tarsus 0.128 mm. for the proximal seg- 

 ment, and distal 0.08 mm. long. Claspers (pi. 63, fig. 13) 0.102 mm. 

 from the distal extremity to the shoulder, and 0.084 mm. across to 

 the shoulder, tapering, upcurved, and armed each with three large 

 spines and a series of smaller hairs on its inner distal margin. Penis 

 nearly as long as the claspers, tapering and upcurved at the tip, and 

 bulbous at the base. Length of forewing l.g6 mm. 



DIALEURODES (DIALEURODES) CITRIFGLU (Morgan). 



Plate 65, figs. 1-14. 



Aleyrodes citrifolii Morgan, Spec. Bull. Louisiana St. Exp. Sta., 1893, p. 70. 

 Aleyrodes nubifcra Berger, Bull. 97, Florida Agr. Exp. Sta., 1909, p. 67. 

 Aleyrodes nubifcra Morrill and Back, Bull. 92, Bur. Ent., U. S. Dept. Agric, 

 1911, p. 86. 



The species described and figured by Morgan is easily separated 

 from citri, redescribed by Riley and Howard in the same year, by 

 the characters of the egg, pupa case, and of the adult. The egg in 



