1915.] 181 



and Dipterous larvae. Some of the trees were evidently dying from 

 the effects of such a concentrated attack. Both the ordinary beech 

 ti'ees and the bronze-leaved varieties appear to be equally affected. 



FONSCOLOMBIA FRAXINI KciU. 



Abundant on the trunk of an ash tree, in Woking town : July. 

 Examples were observed on a young ash at Groring-on-Thames, in 

 March. I have found the same insect sparingly on the branches of 

 ash trees, at Bearsted, Kent. 



KuwANiNA PARVUS Mask. 



Examples of this insect have been sent to nie by Mr. J. C. F. Fryer 

 (of the Board of Agriculture), who found them on gnarled branches 

 of cherry trees imported from Japan, in a nursery garden at St. Albans, 

 Herts. 



Mask ell's description of Spliaerococcus parvus is meagre and 

 poor, and his figures of the insect are quite useless. As the species 

 does not appear to have been adequately figured, I give drawings of 

 the three stages of the insect, and add a few notes of characters that 

 appear to have been overlooked by Maskell. 



Adult female (fig. 6-a). The antennae — as noted by Maskell — consist of a 

 single-jointed .conical tubercle, bearing one or two stout hairs on its apex 

 (fig. 6-b). The dermal pores are of two sizes, namely, minute quinque-locular 

 pores confined princiijally to the marginal and sub-marginal regions, and others 

 of vei'y much larger size (fig. 6-d) \isually confined to the abdominal segments, 

 but sometimes extending on to the thorax. These larger pores are dorsally 

 disposed. Situated on the venter, medio-posteriorly to the hinder spiracles, is 

 a pair of circular cribriform plates (fig. 6-c). The anal ring (fig. 6-e) bears six 

 short stout setae. Maskell distinctly states that the anal ring is " simple, 

 hairless." The organ is extremely small and the setae are frequently broken 

 off, but their position is always indicated by the presence of the circvilar bases 

 from which they spring. My examples of the adult insect average 0.75 mm. 

 in length. 



Nymph (fig. 0-f). The antenna, in this stage, is distinctly 2-jointed 

 (fig. 6-g), with sometimes an indication of a third. The dermal pores are again 

 of two sizes, but are comparatively few in number. The distribution of both 

 the larger and smaller pores is curiously casual and asymmetrical, varying in 

 different individuals. It seems possible that tlieir incidence is determined by 

 exposure, that part of the insect that is lauried in the tissues of the bark being 

 devoid of these structui'es. 



Larva (fig. 6-i). My drawing shows the larva at an advanced stage. The 

 antenna (fig. G-j), as desci'ibed by Kuwanu, is 3-jointcd, the 3rd joint elongated 



