ALEUROCHITON ACERIS. 87 



Morphological characteristics — Female. — Length 1.79 mm. Head 

 without median suture ; viewed from the side, one and one-half times 

 as long as wide. Compound eyes long and reniform, not divided. 

 Ocellus large and distinct, very nearly touching the upper margin of 

 the compound eye. 



The antennae are shorter than the combined length of head and 

 thorax. The second joint is broadly pyriform in shape; it exceeds 

 in length the half of the third joint. The length of the third joint is 

 0.241 mm., longer than all the succeeding joints combined. Joint IV 

 0.048 mm.; joint V 0.75 mm.; joint VI 0.058 mm.; joint VII 0.051 

 mm. in length. Joints III- VII are all provided with fine crosswise 

 wrinkles and with short hairs. The seventh joint is provided at its 

 terminus with fine bristles that are rather long. Joints III, V-VII 

 have small sensory organs. 



Rostrum three-jointed. The third joint twice as long and a little 

 more contracted than the second. All the joints provided with fine 

 hairs and with short scattered bristles. 



Scutellum triangular, provided with a longitudinal suture. 



The legs are rather long. Tibia : Joint I 0.46 mm. ; II 0.53 mm. ; 

 III 0.75 mm. in length. Metatarsus: Joint I 0.189 mm.; II 0.172 

 mm.; Ill 0.214 mm. in length. The joints provided with very fine 

 hairs and with spines that are more or less distinctly arranged in 

 rows. Third joint of the tibia more or less like that in Alevrodes 

 fToleteUa., fragaria., etc.; it has two claws, short and of the same 

 length as the apical bristles of tlie tarsus. The paronychium is large, 

 extended in spatulate or foliate shape, almost twice as long as the 

 claws. 



Wing bordered as in Al. proletella. Length 2.2 mm. "Width 1.1 

 mm. The middle vein forked behind the middle. The main branch 

 reaches the wing border. The submedian rein is long and delicate. 

 The middle vein of the hind wing is unbranched. 



Abdomen large, oval. The four ventral plates more finely reticu- 

 lated than in Aleitrodes proletella. The operculum of the anal aper- 

 ture is as long as it is wide ; its posterior margin sinuate. The lingula 

 as long as the operculum. The genital appendages sharply pointed. 



Male. — The anal aperture is smaller, the operculum is longer, 

 more contracted, and more strongly sinuate. The penis is only 

 slightly bent upward. The genital appendages are not so decidedly 

 curved; their terminus is pointed with shape of a claw, and below 

 the end there is a small sharp tooth. The terminus is provided with 

 a few long bristles. 



The puparium is arched, oval, slightly sinuate at the posterior 

 margin, and also sinuate across the anterior margin. The dorsal 

 side is almost completely covered with a white waxy crust. Only 



