1886.] E. T. Atkinson — On the Homopterous Family Coccidae. 289 



Gmelin ed. Syst. Nat. i (4) 2215 (1788) : Olivier, Enc. Meth. vi, p. 91 (1791) : 

 Haworth, Trans. Ent. Soc. i, p. 308 (1812) ; Bouche, Schadling Gart. Ins. p. 51 

 (1833) : Burmeister, Handb. Ent., ii, p. 74, t. 2, f. 2 (1835) : Amyot and Serville, 

 Hist. Nat. Ins. Hem. p. 629 (1843) ; Walker, List Horn. B. M. iv, p. 1080 (1852), 



Pediculus coffeos, Ledermau, Microscop, t. 9 (1762). 



Diaprostocetus adonidum, Costa, Prospetto di una &o. (1828). 



Trechocorys adonidum, Cartis, Gardiner's Chron. iii, p. 443 (1843). 



Coconidia, Amyot, A. S. E. F. p. 476 (1848). 



Pseudococcus adonidum, Nietner, Obs. Enemies of Coffee-plant Ceylon, p. 4 

 (1861). 



Dactylopius adonidum, Targioni-Tozzetti, Cat. p. 32 (1868) : Signoret, A. S, 

 E. F. (4 ser.), viii, p. 842 (1868) ; (5 ser.) v, p. 307, t. 6, f. 1, la, a d (1875) : Corn- 

 stock, Rep. Agr. Un. States for 1880, p. 341, t 11, f 1, la-d (1881). 



The species which Signoret assigns to D. adonidum, Linn, is de- 

 scribed thus : — 



?. Long, 2| — 3; broad, 1| millims. White, a little yellowish: 

 a median dorsal band, brown ; feet and antennas a little brownish, 

 powdered with a large quantity of farinose matter secreted by spinnerets 

 or pores scattered over the entire body : besides this, each lateral lobe 

 or segment presents a secretion which forms a more or less long woolly 

 appendage around the entire body, increasing in length towards the 

 end of the abdomen, where there are four much larger appendages, 

 of which the two internal are the longest and extend to end of, or 

 beyond the body. Antennas 8-jointed, of which the eighth is the 

 longest, then the third and second, the fourth and fifth are of equal 

 length and shortest, the sixth and seventh a little longer than the 

 fourth and fifth ; there is a slight pubescence especially at the tip of 

 each joint. Feet rather long with a rather spare pubescence ; tibiaa 

 twice as long as the tarsi ; claw stout and long with slender digitules, 

 which are furnished with a very small knob at the tip, abdomen with a 

 more or less distinct and rounded cicatrix on the sutures of the 1-2 

 segments and the median line ; an obiong cicatrix on the sutures of the 

 5-6 segments on each side nearer the margin than the median line ; 

 on each segment a large number of spinnerets in the shape of rounded 

 dots and some scattered hairs. Each lateral lobe presents a space with 

 rounded spinnerets and two more or less stoat, conical spines which 

 form the apparatus for secreting the cottony matter of which each 

 lateral appendage is made : those of the lobes of the extremity of the 

 body have a much larger number of spinnerets and the two conical 

 spines are also much larger ; a little lower down, two hairs arise, of 

 which one is large, around these is condensed the secretion furnished 

 by the spinnerets. The genito-anal ring is very broad, punctured, and 

 furnished with six rather long hairs. 



d . The larvae undergo the change in a cottony envelope and their 



