268 FOREST ENTOMOLOGY. 



no metamorphoses. In addition to these characteristics, the creature 

 develops a strange morphological structure, inasmuch as peculiar 

 flabellfe are attached to its dorsal surface. 

 In short, it is a peculiar form of neuter 

 gender, and contemporary Avith ten or 

 twenty parthenogenetic generations (fig. 

 256). 



I have found it common in Northumber- 

 land, on the under side of the leaves of the 

 purple varieties of sycamore, and also on 

 Acer colcliicum ruhrum. As the green colour 

 of this creature contrasts with the species of 

 Fig. 256.-chaitophorus aceris ^hose plants referred to, it may be fairly 

 Ktlrr'^' m™^^^^^^ '^^^ily recognised, though it must be remem- 



British Apiiides.' Ray bered they are only mere pin-points in actual 



size, and often difficult to find. 

 Mr Theobald informs me that it is common in Cambridge, Devon, 

 and Kent. 



Genus Callipterus. 



This genus is rather important in forest entomology, inasmuch as 

 the species are all arboreal in their habits. Hence it may be well to 

 state the generic characters as given by Buckton — viz. : 



" Rostrum stout, short, does not reach to the second coxse. 



" Antenuce very long, often tipped with black ; third joint much 

 the longest. Seventh joint variable in length, but rarely less than 

 the sixth. 



" Head large, vertex flat, frontal tubercles none. 



" Cornicles very short. 



"Legs moderately long ; longest in the males. 



" Wings generally ample, iridescent, usually clouded with pigment 

 at the extremities of the veins. Stigmata long. Stigmatic cells 

 trapezoidal. 



" Abdomen : in some species the apterous females are hirsute. The 

 last abdominal ring is provided with two anal valves or papillae." 



In habits of life, however, they are quite distinct from other genera 

 belonging the tribe, as those hitherto considered are all gregarious, 

 Avhile the Calliptera, especially in the winged stages, are more or less 

 solitary. When they approach anything like gregarious habits, it 



