PHYSQKERMES. 131 



and after parturition forms a mere shell, each pouch 

 or cavity (e, in both figs. 3 and 3 a) occupying one half 

 of the whole interior ; the cavities are separated by a 

 central wall (c, d, in figs. 3 and 3 a) having a long trans- 

 verse slit (/, in figs. 3 and 3 a), at the dorsal extremity 

 of which is situate the genital orifice (g). It would 

 seem, therefore, that as the ova are passed out of this 

 orifice they fall on either side of the partition-wall, and 

 are received into the pouches, the latter becoming larger 

 and larger as the process proceeds, until the pouches 

 finally occupy the whole of the interior and are filled 

 with eggs. Owing to the folding inwards of the 

 dermis along the ventral slit, it is impossible to trace 

 out the true position of the rostrum and the surround- 

 ing parts in the living insect, but by boiling it in 

 caustic potash the parts swell out. The rostrum (figs. 

 4 b and 5 U) is then seen to be placed towards the centre 

 between the cornicles (c c) and the cephalic extremity 

 (d d) ; immediately below the rostrum are four com- 

 paratively large attenuated processes, converging 

 towards and almost enclosing the rostral filaments ; 

 and between the posterior pair, towards their bases, is 

 an opening leading to the internal pouches for the 

 escape of the larvse. 



So far as known this genus is monotypic, and I 

 believe it is the only member of the Lecaniinae which 

 possesses internal marsupia or pouches. Mr. Claude 

 Fuller * has described a species of Callipappus, belong- 

 ing to the sub-family Monophlebida?, which has also 

 an internal marsupium, formed by the " complete 

 intussusception of several of the abdominal segments 

 of the mature females, .... in which the eggs are 

 laid and incubated." I have also found indications 

 of a similar internal marsupium in the monotypic genus 

 Aspidoproctnsrf but owing to the limited material at 

 my disposal I was not able to trace out its true character. 



* Fuller, ' Trans. Ent. Soc. Lend./ 1899, pt. iv, p. 436. 

 f Newstead, "On a New Scale-insect from Zomba, B.C.A.," ' Proc. Zool. 

 Soc.,' Dec., 1900, pp. 947, 948, pi. lix, figs. 1-9. 



