182 THE ENTOMOLOGIST. 
the same box with them. Body brown. Basal joint of forceps 
rather broad, grey, with one or two small hairs on its outer side ; 
terminal joint brown, directed inwards, thick at.its base, but 
otherwise long and slender. Prolongation of 3rd longitudinal 
vein very weak. 
The specimen described as var. a. represents, I believe, only 
an individual mutation, and var. b. is in all probability the normal 
male. In the absence of positive proof as to this, it seems con- 
venient to treat them as varieties; but the only special characters 
of var. a. are the better-defined third longitudinal vein, the paler 
legs, and the greater number of antennal joints. Of these 
characters, the first two are certainly variable, while the number 
of antennal joints has been found to vary in another species.* 
The specimen described as var. b. was the only male found, 
and no doubt its brown colour is a secondary sexual character. 
It is to be observed that Dactylopius was the only Coccid 
genus present in every instance, so that if the Diplosis is asso- 
ciated with one genus in particular, it must be this. I do not 
suppose that it is a true parasite, but rather that it breeds under 
the Coccide, feeding on their refuse products. 
Institute of Jamaica, Kingston, Jamaica, June 8, 1892. 
A PRELIMINARY LIST OF THE INSECT-FAUNA OF 
MIDDLESEX. 
Compitep sy T. D. A. Cocxerett, F.Z.8., F.E.S. 
(Continued from p. 134). 
LEPIDOPTERA. 
Emmelesia affinitata, St., field at back of Bishop’s Wood, 
Finchley side (Vaughan); MHaretfield, one in 1889 (Wall). 
FE. albulata, Schiff., Mill Hill, two on the common (South) ; Old 
Oak Common, common (Godwin); at lamps in Millfield Lane 
(Vaughan); Ruislip, abundant, 1883 (Watts); Harefield, very 
common (Wall); Kaling (Adye). H. decolorata, Hb., Mill Hill, 
not scarce amongst ragged robin (South); Clutterhouse Lane, 
common, larve in capsules of Lychnis diurna (Godwin) ; Bishop’s 
Wood (Vaughan); Harefield, rather common (Wall); Finchley 
(Shepherd) ; Ealing (Adye); [Northwood (South) ]. 
Eupithecia oblongata, Thnb. (= centaureata), Mill Hill (South) ; 
common generally (Godwin); Camden Town, Kentish Town 
(Vaughan) ; Chiswick, common, larva on flowers of fennel and 
seeding cabbage (Sich) ; Harrow-Weald (Rowland-Brown) ; South 
* See Dr. B. Wagner on the Hessian Fly, in drd Rept. U.S. Entom. 
Comission, Appendix, pp. 12 and 14 (1888), 
