56 NATURAL HISTORY OF KERGUELEN ISLAND. 



The introductioa of the Psocidse iuto foreign countries is very e.as.j. 

 Two species, living in Ceylon upon the coffee-tree, have been collected 

 near liio de Janeiro by Mr. B. P. Mann, on the coffee-trees introduced 

 long ago from Ceylon. Perhaps they are also introduced in Ceylon, 

 Atropos oleagina occurred in Ceylon, and was stated to have been im- 

 ported with oilcake from England; but there is no evidence that the 

 species is British. Other species of Atropos and Fsocus occur in many 

 parts of the world. The curious instance that R. eclipticus has aborted 

 wings, like most of the Kerguelen insects, would in this case not be a cer- 

 tain proof for the habitat. But it is certainly not impossible. 



NOTES. 



Note 1. — As the presence or the absence of the ocelli is a very im- 

 portant character, I have spent a considerable time in examining those 

 organs. I confess that there ure still some doubts about this matter. 

 In the middle of the head, and in the same direction with the upper 

 ends of the eyes, is a transverse air-bubble, or better, a hole filled with 

 air, assuming the shape of the cerebrum, narrower toward the middle 

 from behind, rounded at the end. But the two sides differ in shape. 

 The left side is cylindrical, rounded at the outer end, with a cup like a 

 watch-glass, imitating well the cornea of an ocellum ; the right side has 

 a similar shape, but the outer end is in some way extravasated, begin- 

 ning from the place where on the left side the cornea-like cup begins. 

 The place filled with the extravasation is represented on the left side b3^ 

 a hollow space, to be seen well marked in the interior of the head. A 

 third anterior ocellus is entirely wanting, although the parts are all 

 quite visible, and I see two little prominences which would rei)resent 

 the beginning of the two nervous commissures encircling the oesopha- 

 gus. Though the whole interior of the body is transparent, and the 

 digestive organs are quite visible, I cannot distinguish anything be- 

 longing to the nervous system, not even the ganglia; probably they are 

 too transparent. After all, I consider the above transparent, transversal 

 organ to be the cerebrum, and the ocelli as wanting, the more so since the 

 Psocidse known have either three ocelli or none, but never two. And 

 even h(?re, if the two posterior ocelli only were represented, they are much 

 more separated from each other than in any species hitherto known.* 



Note 2. — The antenuce were broken; on one side only eight joints re- 

 mained, on the other, twelve; but lying near by was the apical part of 

 • 



* So la,r^e a iimuber of joints iu the auteuujB ia onlj^ to be found in species without 

 ocelli. 



