93 



In the above characters the two examples before me coincide ; 

 they differ very widely in the nature of the inequalities of the 

 surface ; in one of them having the hind legs developed to such 

 an extraordinary degree that these are longer than the body, 

 while the hind tibiae are strongly compressed, and dilated to 

 such an extent that their greatest width is scarcely less than half 

 the width of the prothorax. ; and in one of them having lateral 

 depressions for the reception of the posterior legs. 



It will probably be observed that these characters come very 

 near those of Archdeacoa King's genus, Byzenia, which that 

 learned author attributes to the Byi^rhidm (Tr. Ent. Soc. N.S.W., 

 II., p. 74). I have very little doubt that Byzenia is really very 

 near the species I am describing (or that it is a Ulster id), but the 

 Archdeacon says its " legs are not received into cavities," and 

 this is, perhaps, inconsistent with generic identity. In the de- 

 scription of Chlamydopsis, Professor Westwood implies (though 

 he does not state it quite categorically) that there are no cavities 

 for the reception of the legs, and, therefore, I suspect Byzenia 

 and Chlamydopsis are identical (the memoirs characterising them 

 were read in the same year ; 1 believe Westwood's was published 

 before the other). As regards the insects before me, the existence 

 of cavities to receive some or all of the legs would perhaps justify 

 their having a new generic name (or names), but as they are 

 clearly close allies of Chlamydojjsis I do not think any confusion 

 will arise if I attribute them to the latter genus in the doubt as 

 to the relation of its legs to the body. 



I believe the two species described below to be parasitic on 

 fossorial HymenoxAera^ as I found them both (in difierent years 

 and different i^laces) on the top of rotten fence posts in which 

 Ilymenoptera were making their nests. 



C. sterncdis, sp. nov, Mas (?). Subopaca ; piceo-ferruginea, 



antennis pedibus elytrisque dilutioribus ; subtiliter punctu- 



lata et strigosa, puncturis strigisque confuse intermixtis, illis 



squamas minutas ferentibus ; prothoracis lateribus fortiter 



bisinuatis, disco a basi ad apicem gradatim elevato cristam 



magnam formanti (crista apice subbifido, lateribus declivibus 



longitudinaliter bisulcatis, facie anteriori verticali subnitida 



punctata); scutello haud perspicuo; elytrorum humeris valde 



callosis ; pygidio propygidioque verticalibus ; pedibus brevi- 



bus ; prosterno medio longitudinaliter late fortiter carinato, 



carina media longitudinaliter profunde sulcata. Long,, 14- 1, ; 



lat., f 1. (vix). 



The posterior four tibiae are triangular ; the apex of the triangle 



being regarded as the point of attachment to the femur, its longest 



side is the inner margin, and its other sides (subequal) are the 



external margin of the tibia and the obliquely truncate apex of 



