66 Transactions. — Zoology. 



trochanter, nor any terminal spike on the tibia ; the tarsal and 

 claw digitules are all fine hairs. Anal ring compound, with 

 six hairs ; anal tubercles inconspicuous, setiferous. Mentum 

 dimerous, with some hairs at the end. Margin of body bear- 

 ing a few small conical spines wide apart (sometimes absent), 

 which are in pairs or threes on the abdominal segments ; and 

 similar spines are very sparsely scattered on the dorsum, 

 where there are also some scattered fine hairs. Epidermis 

 bearing many circular spinnerets of two sizes ; those on the 

 dorsal surface being twice as large as those on the ventral. 



Larva dark-red, flattish, elliptical, active. Length about 

 •J^in. Antennas thick, with six joints, of which the last is the 

 largest. Feet also rather thick ; tarsus longer than the tibia ; 

 the digitules are all fine hairs. Anal tubercles normal, with 

 moderate setae. Margin of body with only a few very small 

 spines. 



Male unknown. 



Hab. In the Sandwich Islands, at Honolulu ; but said to 

 have been introduced from Japan : on Citrus and a great many 

 other trees and plants. My specimens have been sent to me 

 by Mr. Koebele. 



This insect belongs to the same series of the genus as 

 Dactylopius globosus, Mask., or D. graminis, Mask., in which 

 the female is enclosed in a cottony sac. The species to which 

 it seems most nearly allied is Dact. (Bergrothta) toivnshendi, 

 Cockerell, described in Annals and Mag. of Nat. Hist., 

 November, 1893, from New Mexico. I cannot by any means 

 accept " Bcrgrothia" ; but the species in question appears to 

 be quite near to that from Honolulu. I have been particular 

 in describing the antennae and feet, in which the principal 

 differences exist. In the New Mexico insect the comparative 

 lengths of the antennal joints are somewhat different, the 

 digitules of the claw have " large knobs," and there is a long 

 hair on the trochanter : there are also slight differences in the 

 spinnerets and in the marginal spines. Mr. Cockerell does 

 not describe the larva of D. toivnshendi, and merely says, 

 regarding the cotton, " A small, oval species, covered by a 

 white sac." For the present I shall leave my insect as 

 separate. 



The name which I have attached to this insect seems to 

 be appropriate, whether it should turn out hereafter to be 

 distinct or only a variety. For Mr. Koebele in his first letter 

 to me says, "It has been introduced from Japan within the 

 last three years, and hundreds of trees have been destroyed by 

 it in Honolulu." And in a subsequent letter he says, " It is 

 not confined to Citrus trees, but attacks almost any kind of 

 shrubs and trees. For this reason no plants were allowed to 

 leave Honolulu for the other islands for nearly two years. I 



