14 PESTS OF COFFEE 



in all deta.ils. There is in the laboratory of the Depart- 

 ment a microphotograph of one of these which shows seven 

 segments in the antenn* quite clearly. This micro- 

 photograph is reproduced on Plate III, Fig. 1. Moreover, 

 a reduction in the number of segments, had it occurred 

 then, would not have passed unnoticed as the seven-seg- 

 mented antennae is one of the specific characters of the 

 species as described by Green. 



This sudden reduction in the antennal segments from 

 seven to three made it appear highly probable that the 

 insect was very variable. Mr. Newstead had, as early as 

 1898, described a variety of C. viridis under the name 

 Coccus viridis, var. africanum and this variety was, about 

 fifteen years later, given specific rank by him. It was 

 thought advisable, therefore, to make a study of the insect 

 from various parts of the world. Specimens have been 

 obtained from Ceylon, Java, Seychelles and Hawaii. 

 Those from Ceylon, Seychelles and Hawaii are still true 

 to Green's original description. With regard to those 

 from Java, Mr. Keuchenius writes as follows in a letter 

 received from him : — " The variability of Lecanium viride 

 is a difficult and troublesome question. Green, in his 

 standard work, does not mention at all any variabiUty and 

 therefore, in the beginning, I had thought that I had to 

 do with two different species ; but afterwards I came to the 

 conclusion that L. viride varies strongly. In the same loca- 

 lity and in the same garden and on the same kind of coffee 

 (but on different trees) one may find the following forms : — 

 (1) A large form with a very flat body which is of a green 

 colour, (2) a smaller form with a more elevated body 

 and of a darker dirty greenish colour. Between these 

 extremes there exist all kinds of nuances." The Mysore 

 form is different from all the other forms examined and 

 has been described as a new species by the junior author 

 in a paper read before the meeting of the Indian Science 

 Congress held in 1917. The following is his description 

 of the new species :-— 



Coccus COljEMANi, NOV. SP. Adult female. 



Characters as in C. viridis but antennse three-segmented, the first 

 and second segments being subequal the third from five to si:? times 

 the length of the first segment and having a number of apical and sub- 

 apical hairs. The dorsal " x "-shaped carina not found in any stage. 

 Deruuil cells more round tlian oval, few and scattered over the dorsimi 



