ORIKXTAI, (JOLIJCMnoi.A. 83 



possessing a median cereus to tlie fifth segment of tlie atxlomen. 

 A new sub-family -the Heteroniuncin;e — has been created for its 

 reception. A second new genus, FseudocypJLoderns, with a single 

 species, occurs in nests of Termites near Lake Chilka. 



In no instance has a new genus been created unless I Jiad at 

 my disposal at least five specimens, and many of the new species 

 have only been founded after an examination of a series of twenty 

 or moi-e examples. At least nine apparentl}'- new species, and 

 two new genera, ha^'e been left undescribed owing to there being, 

 in these particular instances, only one or at the most two speci- 

 mens of each at my disposal. A few years' experience with the 

 Collembola is sufficient to teach that, apart from colour and size, 

 such structural features as the number of teeth to the claws of the 

 feet, and the relative lengths of the antennal joints, frequently 

 cannot be relied upon for specific purposes, unless several spe- 

 cimens are at hand for comparison. 



Unless definitely stated otherwise, the descriptions have been 

 drawn up from specimens preserved in alcohol. In this connection, 

 it is important to take into account the fact that a variable amount 

 of contraction of parts frequently takes place. The relative 

 lengths of the trunk segments, and the joints of the antennse, are 

 difficult to represent with complete numerical correctness, owing 

 to the contraction (or telescoping) that takes place in many in- 

 stances from this cause. However, in almost every instance the 

 numerical ratios given in this paper have only been arrived at 

 after having made a series of measurements on several specimens. 

 These measurements were obtained by the aid of a Leitz drawing 

 apparatus and a Zeiss micrometer'. In all cases the measurement 

 of the relative lengths of the trunk segments has been taken 

 along the mid-dorsal line of the body. 



As regards the terminology employed, I ha,ve in every instance 

 used the word body to denote the whole insect, excluding, of coui'se, 

 the appendages, and the word trunk to mean the thorax and 

 abdomen. As regards the configuration of the farcula, I have 

 described that organ in the extended attitude, projecting back- 

 wards. The terms dorsal and ventral and anterior and posterior 

 are used with reference to the organ in that position. The 

 use of these terms in this connection has been made solely foi- 

 purposes of description, without any reference to their being of 

 moi'phological value. 



The measurements of the length of the different species refer 

 to the body only, and do not include either the antennae or 

 furcula. 



Owing to the fact that it has not been possible in India to 

 consult certain Papers of the earlier zoological literature, a few 

 of the references to the original descriptions of genera and species 

 have been quoted on the authority of Tullberg's " Sveriges 

 Podurider " ; these are denoted thus f. 



The majority of the specimens are to be found in the collection ' 

 of the Indian Museum, Calcutta, and the reference numbers to« 



6* 



