124 



[November, 



[Ab an addition — small — but of some interest, as being the very latest — to the 

 list of errors and confusions about C. socius, it may be added that in the report of 

 the meeting of the Entomological Society, September 5th, 1888, given in the October 

 number of this Magazine, p. 117, Mr. Champion is said to have exhibited Cathor- 

 miocerus maritimus from the Isle of Wight ; whereas, the species exhibited was 

 C. socius, and was, in fact, duly announced as such at the meeting. — D. Sharp, 

 October 3rd, 1887.] 



NOTES ON SOME BEITISH AND EXOTIC COCCIDM (No. 11). 

 BY J. W. DOUGLAS, F.E.S. 



Fig. 1. 



Male unknown. 



Pseudococcus ulmi, n. sp. 



$ adult. Oval or ovate, brownish-yellow, closely 

 covered on the upper-side with white mealy powder, less 

 so on the lower side ; margin all round with distinct, 

 horizontal, conical, white, granulose projections, two of 

 them at the posterior end much longer than the others ; 

 about the rostrum many hairs, a scant series along 

 the margins of the body between the projections, six on 

 the ano-genital ring, and four or five on the lobes. 

 Antennse (Fig. 1) slender, tapering, of nine joints ; 1st 

 stout, long ; 2nd and 3rd longest of all ; 2nd one-sixth 

 longer than 1st ; 3rd shorter than 2nd, about as long as 

 1st ; 4th short, half the length of 3rd ; 5th one-fourth 

 longer than 4th ; 6th shorter than 5th ; 7th and 8th 

 still shorter, sub -equal ; 9th nearly as long as 3rd, with 

 a long, obtuse apex ; all with a few projecting simple 

 hairs, more numerous on 9th joint. Legs (Eig. 2) stout, 

 with distant simple hairs ; tibiae very long ; tarsi one- 

 third the length of the tibiae ; claws very short. It 

 should be noted that most of the apical hairs on the an- 

 tennae, tarsi and claws appeared to be capitate, but this 

 was due to the adventitious presence of extraneous 

 matter, for under a high microscopic power they proved 

 to be simple. Length, 4, breadth, 2"5 mm. 



This species is a Bear ally o£ Ps. aceris* cesculi, mespili, and 

 platani, but, according to the descriptions of these species by Signoret 

 (Ess. Cochen., pp. 363 — 368) it differs from them in several respects, 

 especially in tbe relative proportions of the joints of the antennae. 

 It differs still more from Ps. hrunnitarsis and Ps. hederce, but it re- 

 sembles them in being devoid of digitules on the tarsi (the former 

 species has them on the claws only). 



