On the continent this species occurs in woods, and on heaths, etc., but in Britain it is seemingly confined to salt marshes. Although it has been recorded from the Suffolk coast, and other places, the best localities for it are probably the salterns, from Gravesend to the Isle of Sheppey, and at Southend and Shoeburyness. [Illustration] Pl. 48. 1, 2, 3. LACKEY MOTH. 4, 5, 6, 7. GROUND LACKEY. [Illustration] Pl. 49. 1, 1a, 1b, 1c. LACKEY: _eggs, caterpillar, chrysalis and cocoon_. 2, 2a. HYBRID BETWEEN LACKEY AND GROUND LACKEY: _eggs and caterpillar_. 3. GROUND LACKEY: _caterpillar_. {111} _Malacosoma_ hybr. _schaufussi_, Standf.--In 1884 Dr. Standfuss made some experiments in crossing three species of _Malacosoma_, and one of these was the pairing of _M. neustria_ [male] with _M. castrensis_ [female]; the offspring he christened as above. Since that time others have succeeded in crossing the two species with varying results. On August 13, 1906, Mr. Percy Richards sent me a small batch of eggs (Plate 49, Fig. 2a) laid by a female, _M. castrensis_, that emerged in a breeding cage, and had paired with a captured male, _M. neustria_, he introduced. The larvæ hatched out one or two at a time, from April 7 over a period of more than a fortnight. Few of the caterpillars would commence to feed, and of those that took to the plum and sallow with which they were supplied, only four reached maturity. Three of these pupated during late June and early July, and three moths, all females, have emerged up to date, one on July 28, another on August 6, and a third on August 13. The second specimen was very much crippled, probably owing to the cocoon having been accidentally injured. One caterpillar was still feeding on August 14, but died about the 26th. The mature larva (Plate 49, Fig. 2) has the head and markings thereon like _neustria_, also the black spots on the first thoracic segment, but they are rather large and inclined to unite. The bluish line along the sides is dotted and freckled with black rather more thickly than in _castrensis_; the dorsal line is very thin, but bluish as in _castrensis_, and the red lines on each side of it are broad. In colour the three moths are deeper brown than any form of either parent species that I have seen, but the transverse lines, and especially the outer, are most like those of _neustria_. It should be mentioned that much information on Hybridism in the Lackey moths and other species will be found in Tutt's "British Lepidoptera," vol. ii. {112} THE PALE OAK EGGAR (_Trichiura cratægi_).