228 THE CANADIAN ENTOMOLOGIST. 



This is so with Disippus. The ends of the leaves have been eaten away 

 and only the sides need shaping. But if the residue is insufficient, or for 

 any reason does not answer the purpose, the caterpillar moves to another 

 leaf and begins cutting. 



ON A NEW PSOCUS. 



BY WM. H. ASHMEAD, JACKSONVILLE, FLORIDA. 



In my investigations of the insects of the Orange tree, I have dis- 

 covered another curious insect on some branches infested with Scale 

 Insects, and given me by Major A. J. Russell. I at first took them to be 

 Aphides, but on closer examination they proved to belong to Psocus. 



The eggs are laid in oval masses under and frequently on upper part 

 of leaf, and are protected by a closely woven web. through which are 

 sprinkled sooty particles. The young, when first hatched,, are very 

 active, white, Aphis-like looking creatures, from a dozen to twenty clus- 

 tered together, in all stages of development, beneath the web. On dis- 

 turbing they disperse from under it with surprising rapidity. They 

 probably prey upon the young Scale Insects and the decaying matter 

 caused by them. As I can find no description or mention of them, I 

 submit the following : 



Psocus citricola, n. sp. 



Elongate, pale yellowish ; head large, as wide as long, outer edge from 

 eye to eye forming a perfect half circle ; eyes are large and very promin- 

 ent ; maxillary palpi four jointed, the basal joint little longer than either 

 of the others, but narrower ; the others about even in length but gradu- 

 ally increasing in thickness, the last being the thickest ; antennas three- 

 jointed, first two short, same size, as wide as long ; the last joint is long 

 and filiform, reaching nearly to the end of abdomen, and covered with 

 long fine hair ; thorax narrower than head, slightly longer than wide, 

 rounded at ^dges, with a transverse suture dividing it into two parts (im- 

 mature specimen) ; abdomen longer than head and thorax together, eight 

 segments, the largest being nearly twice as wide as thorax ; legs six, rather 

 long, tarsi two-jointed, ending in two minute claws. The abdomen and 



