278 MR. a. brook's revision of the 



Entomobrta multipasciata, var. JSTicoletii, LiihJc. 



Terminal two segments of the antennae violet. There is a dot 

 between the antenute, two spots of colour on each side of the centre 

 of tlie basal margin of the fourth abdominal segment, and a dark 

 basal line on the fifth. There are no markings elsewbere, and 

 the general body-colour is yellow. There are, bowever, no stran- 

 gulations in the antennse and between the manubrium and dentes 

 as figured by Lubbock ; but I bave not observed these in any 

 species of Entomobrya. Tullberg included this as a variety of his 

 muscorum ; but I regard muscorum, Tullb., and muUifasciata, Tullb., 

 as varieties of the same species, and tbe variety muscorum comes 

 intermediate between the type and Lubbock's JSficoletii ; but as 

 I do not tbink it a constant form, I have not ranked it here 

 as a variety. I am now speaking of Tullberg's muscorum ; the 

 variety described under that name by Nicolet is much more likely 

 to be a young OrcTiesella. I have a specimen of O. cincta in my 

 collection almost identical with Nicolet's figure. 



I have one gathering of over 100 specimens, all collected from 

 a stunted elm in St. Clement's Bay, Jersey, in wbich there is not 

 only the typical muUifasciata, Nicoletii, and lanuginosa, but many 

 internaediate forms, so that I think there is little doubt of these 

 being varieties of the same species. I have photographed a good 

 many specimens, some of which are used to illustrate this paper, 

 descriptions of which will be found at the end. 



Entomobrya multifasciata, var. lanuginosa, Nic. 



This variety has uomarkings, and is usually rather more hairy 

 than the other varieties. The first mark that appears is one 

 between the antennae ; then those at the base of the fourth and 

 fifth abdominal segments, as in typical Nicoletii. After this the 

 markings on the fourth abdominal segment spread a little, the 

 line along the epimera begins to show itself ; next a double row 

 of dots along the segments from the metathorax to tbe third ab- 

 dominal segment ; and a third development of these brings us to 

 the typical multifasciata. In fact, unless all these forms are 

 reo-arded as one species, one might raise almost every half dozen 

 specimens to the rank of a species. Doubtless the nature of the 

 environment has something to do with the development of colour 

 in this species ; for instance, I have usually found specimens from 

 the low herbage on sandhills to be pale yellow and almost all 

 without markings, and those from the trunks of trees usually are 



