TRICHOPTERA IN DORSET. 111."; 



and May, but it is not common. L. luridus, Curt., another rarer 

 species, occurs in June and July about ponds at Morden, Bas1 

 Lulworth, and on the backwaters of the Frome at Ilford. evidently 

 breeding in either still or slowly moving water. These three species 

 are local. Anabolia nervosa, Curt., is very abundant on the Frome 

 system and also on the Morden Park lake at the entry and outfall 

 of the stream. It may be seen in multitudes running up the flags 

 and rushes evidently when first hatching out, on bright warm 

 days from early to late fall. It will even settle on the collector 

 sitting by. At other times the insect hides by day in the bank 

 growth. L. rhombicus has a similar habit. Of species of Stenophylax, 

 stellatus, Curt., is far commoner than latipennis, Curt., coming to 

 light freely like the very common permistus, McLachlan. S. stellatus 

 is found mostly in September, occurring often in Winfrith, bred 

 from the village brook, also on the Frome and on the Puddle at 

 Carey. S. latipennis occurs at Iford in September. Nearly all my 

 specimens of permistus have been taken in April and May, perhaps 

 hibernated. It occurs freely at Winfrith, Bockhampton. and along 

 the Frome, often harbouring of a day in outhouses. Micropterna 

 lateralis, Steph., occurring along our heathland brooks in June in 

 those spots " that seem to lie sacred to flow'rets of the hills, and 

 sacred to the sky," is retiring and seldom seen. Halesus radiatus, 

 Curt., is very numerous by streams at Morden, Moreton and Iford. 

 H. digitatus, Schr., is not so common, but occurs on Winfrith Heath 

 by the Frome. These species sometimes dance gregariously in the 

 sunshine. They often come to light at night. Drusus annulatus, 

 Steph., has occurred in May on our Winfrith brook, although this 

 is but very rarely swift. It is not common. I have no record of 

 Chaetopteryx villosa, Fab., from this area, though it will surely 

 occur on streams here, as in other parts of Dorset, from early to 

 late autumn. The variable Sericostoma personatum, Spence, is 

 abundant on all the rivers, and lends some animation in summer 

 to many a stream as it wends its way through the green pastoral 

 tracts. I have seen it ovipositing in the pond in Morden Park. 

 Like most of the Sericostomatidae it does not travel far from the 

 water, and flies by day and of an evening readily. Notidobia alums, 

 Steph., is abundant, especially in May, at Lower Bockhampton, 

 Iford and Moreton, and is of similar habits, and very noticeable, 

 resting on the herbage. Goera pilosa, Fab., is common in June 

 and July at Iford and Moreton. Silo nigricornis, Pick, is another 

 frequent species flying over rivers in the sunshine at .Morel on. 

 Stafford, and Bockhampton, notably in May, but also late, in the 

 season. The whole family tends to be diurnal. Lepidostoma hirtum, 

 Fab., another of our common river caddis-flies, is found at Easl Stoke. 

 Holme and Moreton in July, August and September. Brachycentrus, 

 subnubilus, Curt., swarms on the Frome in April and May. sporting 



