30 [February, 



Eeaumur's figures, however, are not very specialized in detail, and 

 although his account of the life-history of the insect is very inter- 

 esting, yet his description of the insect itself is not sufficiently 

 characterized to enable us to identify with precision the species which 

 he describes. We must, therefore, refer to more modern writers for 

 assistance in the determination of the species under consideration. 

 Westwood (Int. Class. Ins., ii, p. 448), describes only one species of 

 one genus, viz., Aleyrodes chelidonii, and he mentions that the wings 

 have only one strong central nerve, pointing out that Burmeister is 

 incorrect on this point in his figure (i andb. d. Ent., ii [i], Taf. ii, 

 fig. 7). I note that both of these authors mention the species as 

 having antennae of six joints, and Burmeister {ih., p. 82) describes 

 the 2nd joint as very long, 3rd, 4th, and 5th equal. Curtis {op. cit.) 

 describes his species, A. cocois, as having 7-jointed antennae, of which 

 the 2nd is the longest. Now% in both of the species under considera- 

 tion, it is the 3rd joint which is the longest, and which is, as Burmeister 

 described his 2nd, very long. I should suppose that both Burmeister 

 and Westwood did not count the basal joint when describing the 

 antennsB as 6-jointed, and then in that case the 2nd joint would really 

 be the 3rd. But Curtis, while describing the antennae as 7-jointed, 

 still says that the 2nd is the longest, so that, as he obviously did not 

 count the basal joint, the antennae of his species would really have 

 had eight articulations.* I have experienced considerable difficulty 

 wdth the antennae of the dried specimens sent to me, for they were 

 nearly all broken, and it was only in one or two instances that I was 

 able to preserve the antennae in a complete state. They appear to me 

 to consist of seven joints, of which, undoubtedly, the 3rd is much the 

 longest. 



With reference to Aleurodes cocois, Curtis says (/. c.) : — 

 " There is a little white mealy fly, which sometimes infests the cabbages, and 

 an allied species has been sent from the West Indies, which differs from it in its 

 structure and economy. # * * On carefully examining the leaves of the cocoa- 

 nut it is evident there are two distinct insects upon the under-surface, an Aleyrodes 

 and a Coccus. They adhere to the under-side of the leaf, and are surrounded by a 

 white cottony or resinous powder ; both sexes of the Aleyrodes at rest, and with 

 their wings closed, are exhibited of their natural size on a portion of the leaf (fig. 1), 

 and also some oval animals producing the white powder in abundance from the 

 margins of the sides, and these I suppose are the larval state of the Aleyrodes. 

 There are also numbers of white linear cases, as shown at fig. 5, which I consider to 

 be the pupa of a male Coccuh ; indeed, I found one of the perfect insects sticking 



* c. /., Ent. Mo. Mag., xxiv, p. 265, for a summary of various authors' statements of the 

 number of joints in the antennae of Aleurodes.— J. W. 1). 



