2(J0 BRITISH APSIDES. 



to make the above measurements from a specimen 

 mounted by M. Richter, of Montpelier. 



General colour, yellow. Antenna3 with five articu- 

 lations : the last three joints are much ringed. Vertex 

 fiat, and without the horns seen in the larva. Eyes 

 large ; stemmata obvious. Wings folded flat on the 

 back. Cubital vein is once forked; and it does not 

 reach to the cubitus. First and second oblique veins 

 unite just before they touch the cubitus. Rostrum 

 reaches to the second coxae. Legs short, tarsi with 

 two claws. 



The general appearance of the larva is so coccus- 

 like, that the venation shown by the imago is a little 

 unexpected. 



Although this Aphis takes its specific name from 

 the palm-tree, it really affects many other plants in 

 the hot-houses of the horticulturist. M. Lichtenstein 

 says that the larva is very abundant on Latania, 

 Calamus, &c. It occurs here on Orchis and other 

 plants. To the naked eye, they appear as black spots 

 surrounded with white rings. They make patches on 

 the leaves composed of twenty or more individuals. 

 "When once the Aphis attaches itself, it does not appear 

 again to move from its place, but the young rove about 

 for some time after their birth. 



M. Lichtenstein thinks that the imago has some 

 resemblance to Vacuna (Thelaxes), but it certainly 

 wants the characteristic cornicles. I am unable to 

 state the venation of the lower wings. 



I counted at least eight embryos within the abdominal 

 cavity of the imago; so the imperfect sexes of this 

 species arc clearly viviparous. 



The generic name of this insect must not be con- 

 founded with Cerasaphis, of Amyot, which feeds on 

 the cherry tree. 



