OF EPPING FOREST. I^I 



Geims ANDRICUS {Hartig). 



So far as we know at present, the genus Andvicus includes a 

 greater number of oak gall-making species than any other of our 

 genera. I have kept the generic named Andvicus for both gener- 

 ations. Adler gives Aphilotrix as the generic name ot the 

 agamic generation. Some species have no sexual generation 

 [A. seniinationis (Gir.), A. quadvilineattis (Htg), etc.) ; these have 

 only one generation a year. 



The agamic forms of this genus have the antennae as 

 a rule 14-jointed, 13 antennae joints being the exception. The 

 colour varies, a few species being quite black. 



The sexual forms differ from the agamic in having the 

 antennae as a rule 13-jointed. Andvicus cuvvatov (Htg), however, 

 has 14-jointed antennae. The colour is not so variable, the 

 majority of species being quite black. 



I have found that in some cases the agamic forms of this 

 genus are apparently much more common than the corres- 

 ponding sexual generation. This is especially the case with such 

 species as A. callidoma (Htg.) and A. fecundatvix (Htg.) A. 

 callidoma is fairly common in Epping Forest, but I have only once 

 found A. civvatus (Adler). A. fecundatvix again is exceedingly 

 common, but I have not been able to find a single specimen of 

 A. pilosus (Adler), in spite of repeated search. I have also 

 obtained several specimens of A. malpighii (Adler), but have 

 not met with A. nudus. This might be due to the fact 

 that these catkin galls are easily passed over unnoticed ; 

 but I do not think that this is entirely the reason, as I thoroughly 

 examined the catkins on a great number of trees without success. 

 During two days' collecting in the neighbourhood of Lynton, 

 North Devon, I found all three species to be very common at 

 the beginning of June, 1900. 



(11.) Agamic Generation I. Andricus sieboldii (Htg.) 



Inquiline. Synevgus incrassatns (Htg.) 



Gall. 



Appear through the bark of the stems of the oak, usually 

 near the base not far from the ground. They are found as a rule 

 on small oaks in hedges, and on old pollard oaks. The galls 

 penetrate deeply into the wood, stunting the growth, and some- 

 times killing the younger plants. Colouv, Cherry red when young. 



