432 D. J. SCOURFIELD OX A NEW COPEPOD FOUND IN 



has been given to the subject owing to the endeavour to discover 

 the life-histories of mosquitoes and other insects supposed to be 

 connected with the dissemination of tropical diseases. Last year 

 a very elaborate paper was published by Picado (8), in which 

 he gives details of the facts previously elucidated, and of his 

 own work on this subject in Costa Rica. It appears that no 

 less than about 250 species of animals have been found living 

 in this peculiar environment, 49 being new to science. They 

 belong to almost all groups of Invertebrates, but naturally 

 insects and their larvae predominate. The Amphibia are also 

 represented. A very full account of this paper has been recently 

 published by H. Scott in the Zoologist (12). 



When once this peculiar habitat had been pointed out, it was 

 natural that somewhat similar situations should be searched, and 

 records have indeed been made of animals found living in the 

 pitchers of Pitcher-plants and Sarracenias, the holes occurring 

 occasionally in bamboos, the tops of palm trees, and in various 

 other places. 



It occurred to me that perhaps the little collections of water 

 which are sometimes to be found in the hollows and crevices 

 on the trunks and exposed roots of trees might possibly be 

 inhabited by some member or members of the Entomostraca, 

 the group in which I am more particularly interested. This 

 proved to be the case ; at least I am now able to report that 

 on several occasions I have found the minute Copepod about 

 to be described in such little reservoirs of water on trees in 

 Epping Forest. Up to the present it has been found nowhere 

 else, and, on the other hand, I have never found any other 

 species of Entomostraca in the same places. 



The new species evidently belongs to the Harpacticid genus 

 Moravia T. and A. Scott, and I propose to call it M. arboricola 

 on account of its tree-dwelling habit. 



The genus Moravia is very closely allied to the well-known 

 genus Canthocamptus, and is, in fact, even now included in the 

 latter by some authors. It was instituted by T. and A. Scott in 

 1893 (14) for a species found in Loch Morar, in Scotland, which 

 they named M. andevson-smithi, believing it to be new, but 

 which subsequently proved to be identical with C anthocamptus 

 brevipes Sars, described thirty years previously (11). A month 

 or two later in the same year, 1893, Mrazek described as new 



