424 



Transactions of the Society. 



exclude the Echinosomatinse, and perhaps also the Pyragrinx, 

 which have Pygidicranine affinities ; on the other hand, if we 

 define it by the presence of gonapophyses in the female, we bring 

 in the Allostetkinse. Unfortunately, the latter organs have not 

 been examined in the Diplatyinn\ h'arscliiellinie, and Pyragrinse. 

 The Karschiellinse are a very primitive group, having segmented 

 caudal setae in the larval instars like the Diplatyinss, and probably 

 gonapophyses are present in the females of both. Fortunately 

 there is no difficulty in discriminating these groups, all of which 

 are well characterized by other features. It therefore becomes 

 a merely academical question whether we shall include in the 

 Pygiclicraninte those groups in which the female has gonapophyses 

 but reduced telson. As a matter of pure convenience, therefore, I 

 prefer to define the Pygidicraninse as that group in which either 

 the telson is free, or, alternately, in which the female has gona- 

 pophyses ; in some cases, both features may be present simul- 

 taneously. This, I admit, is presuming for the moment the presence 

 of gonapophyses in the female of the Pyregrinse, Karschiellin.r. 

 and Blajidicinas, which remains to be demonstrated. 



The original feature of this arrangement' is the inclusion of the 

 Allostethinse on the strength of the presence of gonapophyses of 

 the female, which has not previously been recorded. 



Table of Sub-families. 



1. Femora compressa ac carinulata (gonapophyses 

 ? adsunt). 



2. Antennae setaceaa, segmentis 15-25, quinto 

 elongato. 



3. Corpus apterum ; metanotum larvale ; 

 rnetasternum postice truncatum ; 

 cerci larvarum haud segnientati ; 

 virga simplex ; oculi parvi 



3, 3. Corpus alatum ; metanotum haud 

 larvale ; rnetasternum postice con- 

 cavum ; cerci larvarurn segmentati ; 

 virga bifurcata ; oculi magni . 



2, 2. Antenna? 25-33 segmentate, quinto et sexto 

 brevibus. 



3. 1 penis abortivus ; antenna? crassae, 

 segmentis 4, 5, et 6 transversis ; 

 cerci larvarum segmentati ; (genera 

 ethiopica) ..... 



1. Anat.elix.e. 



2. DlPLATYINiE. 



3. Karschiellix^e. 



3, 3. A.mbo penes perfecti ; antennae 

 setaceae, segmentis 4, 5, et 6 bre- 

 vibus, sed haud transversis ; cerci 

 larvarum haud segmentati . . 4. Pygidicraninje. 



