452 



ARACHNIDA PHALANGIDEA 



CHAP. 



Fm. 237. Nemastoma 

 lugubre. 



the mature state at all seasons of the year. There are about 

 twenty European species, but only t\vo of these, N. lugulre and 

 N. chrysomelas, have as yet been found 

 in Britain. N. lugubre is a very common 

 animal, and though it does not obtrude 

 itself upon public notice, its little black 

 body with two pearly white spots must 

 be a familiar object to all insect collectors 

 who have occasion to search under stones 

 or among moss in damp places. Its 

 legs are short and stout, but those of 

 N. chrysomelas, which is a brighter 

 coloured Harvestman with spots of dull 

 gold colour, are long and slender. 



Fam. 4. Trogulidae. Coriaceous 

 and very hard integument. Anterior part of cephalothorax pro- 

 duced into a bifurcate " hood." Often a " trochantin." 



The Trogulidae are very slow-moving Phalangids of moderate 

 or large size (a sixth to half an inch in body), found under stones 

 or in damp moss and debris. They are Mite- 

 like in general appearance, and may readily 

 be distinguished from all other Harvestmen by 

 the presence of the " hood" (Fig. 230, p. 442), 

 the hollo wed-out under surface of which forms 

 a chamber, called by Simon the " camerostome," 

 in which lie the basal portions of the pedipalps. 

 Only a single immature specimen has 

 been found in England, belonging probably to 

 the species Trogulus tricarinatus. It was 

 I'nund in Dorsetshire. Some members of the 

 family are not uncommon in various regions 

 of the Continent. There are four genera, 

 Dicranolasma, Anelasmocephalus, Calathocratus, FIG. 238. 

 ;i nd Trogulus. Two other genera, Amopaum and Differ s?mou.) H 0d ' 

 Metopoctea, have been established, but the former 

 is probably the young of Dicranolasma and the latter of Trogulus. 

 According to the monograph on the British Phalangidea by 

 the Eev. 0. Pickard-Cambridge, cited above, the following species 

 have been recorded in this country. They all fall under the 

 sub-order Plagiostethi : 



