262 BOARD OF AGRICULTURE. 



The best method of removing all the bark-lice, as well as the 

 Thrips, is to wash the plants thoroughly with strong soap-suds, 

 and give them frequent showerings with the hose. 



The Plant-house Aleurodes. — (PI. 1, fig. 9, enlarged ; fig. 9a, 

 pupa, enlarged.) Mr. J. L. Russell has found this insect, which 

 belongs to the same family as the Coccus, in great abundance on 

 the tomato in his garden in Salem, and also on some of his 

 house-plants, especially Salvia splendens. I have also found it 

 on fuschias in February and March in all its stages. In this 

 genus the females are winged as well as the males, and the two 

 sexes are much alike ; the antennae are 6-jointed, with the 

 second joint lengthened, and in the fore wings, which are broad 

 and covered with a fine white powder, there is but a single vein. 



The young, or larvae, of the present species, which seems to 

 be the Aleurodes vaporarium Westwood, so called from living 

 in hot-houses, is somewhat like the young of the two other 

 genera of bark-lice mentioned above, being broad, oval, thick, 

 with the middle of the body raised longitudinally ; the segments 

 are distinct, and there are two very short anal hairs. The abdo- 

 men is wrinkled transversely, the head and thoracic segments 

 being smooth. They are .03 of an inch long. The pupa is 

 convex, rather thick, oval, elliptical, with a fringe of hairlike 

 filaments around the edge of the body, from the top of which 

 arise from six to nine long hairlike filaments, secreted, as Sig- 

 noret states, from the surface of the' body on each side, project- 

 ing straight up ; two of which arise from the head. It is yellow- 

 ish-green, and .03 of an inch long. Just before the imago 

 emerges, the head and thorax of the pupa are very convex, and 

 much higher than the abdomen, and the eyes of the adult are 

 very prominent. 



The adults have pale, yellow bodies and pure white, unspot- 

 ted, powdery wings, with dark-red eyes ; the beak is very long 

 and dusky at tip, and reaches beyond the base of the thorax. 

 The second joint of the antennas is twice as long as the basal 

 one, and is nearly globular ; the median vein of the fore wing 

 is forked just beyond the middle of the wing. 



Early in September they were so abundant on the tomato as 

 to rise in clouds like snow-flakes from the leaves, on being dis- 

 turbed, according to Mr. Russell, 



This genus seems allied to the Psyllidse, in the females being 



