1921.] 191 



Caudal setae slightly longer than those of the anal ring. Ceriferous tracts 

 (cerarii) confined to the margins of the abdominal region, none on frons or 

 thorax; from five to seven pairs of these cerarii can he distinguished. Spines 

 of the anal tract relatively slender, acutely pointed ; the preceding two (or 

 three) tracts with smaller and more slender spines; beyond this point the 

 cerarial spines tend to become setiform. The gradual transformation of the 

 cerarial spines is represented in tig. 6, a~e. Similar setae, or setiform spines, 

 are scattered over the dorsum ; those on the frontal area larger and more 

 crowded. Small trilocular pores numerous, evenly distributed, not concen- 

 trated on the cerarii. Some larger circular pores (associated with short but 

 stout ducts) are scattered sparsely over the body. 



Length 2-5 to 3 mm. ; breadth 1 to 1*25 mm. 



Wicken Fen, Sept. 1920. The insects were found on the undei sur- 

 face of the foliage of various plants, including Tlupatorium cannahimim, 

 Si/mphytum officinale, TIrtica, Li/simachia, Convolvulus, and Sjjiraea. 

 Many were wandering freely ; others occupied angles between tlie 

 prominent veins of the leaves, in which position the anterior half of the 

 body was pi'otected by a loose canopy of white secretionary matter. 

 These canopies remain attached to the plant after the insects have 

 vacated them. Specimens kept in captivity forced their way into 

 crevices of the box, in which they constructed dense white ovisacs. 



Allied to Tiihernlcus, from which it may be distinguished by the 

 number of the cerarii (2 in liibernicus, 5 to 7 in j^fd^K^inus), by the 

 form of the cerarial spines, which are very much stouter in hihernicus 

 (compare a and h with /"and _^), and by the absence of a circumscribed 

 denser area on the anal cerarii. The tibia of the mid leg of pahidinus 

 is proportionately much longer, being approximately three times the 

 length of the tarsus. 



p^ ^ipersia tomlini Newst. — An unfortunate mistake occuri'ed in my 

 remarks (Ent. Mo. Mag., Ivi, June 1920, p. 122) on this sj)ecies. 

 T there refer to a reduction in the number of the antennal joints "being 

 brought about by a partial or complete fusion of the 2nd and 3rd joints." 

 This should read '* of the 3rd and 4th joints." 



Ripersia europaea Newst. — Examples of a Rlpersia, taken on roots 

 of grasses in nests of Lasius nifjer, at Minehead (Somerset), Sept. 1920, 

 have been determined by Prof. Newstead as europaea. Although no 

 record of this species as a British insect has appeared in print, I 

 understand from Prof. Nevvstead that it has been taken in this country 

 on several occasions by Mr. Tomlin and Mr. Donisthorpe. 



Ripersia halophila Hardy. — On roots of Suaeda fniticosa, Sfatice 

 hinervosa, RndAr/neritr iiiarifima(B\ixkemij Point, Norfolk, 19.vii.l920). 

 The insects were particularly abundant on the roots of Suaeda, wliicli, as 



