30 



and it was thus impossible lo rear the larva. Nevertheless I can give some 

 description of this larva. In some |)l;iiikl()ii samples from Taboga from 

 November and Decembei- H)15 1 lind lliice specimens ol ;iii Arhnciid- 

 larva. Since Arh. sicllala is the only species of the Arhaciida' known 

 to occur in the (lulf of Panama'), and since young specimens of lliis 



Fig. "). Skeleton of larvH of Arhacia stcllala. -'"/i- I" tin- right side is represented separately 



part of I ho ouUt end of the postoral rod. 

 al. anterolateral rod: b. body rod: da. dorsal arch; pci. posterodorsal; i)l. posterolateral; 

 po. postoral: ptr. posterior transverse: r. recurrent rod. 



species were fairly common in the said locality, there can be no doubt 

 that this larva does really belong to .1. slcllalo. 



None of the three specimens are quite fully developed, but the specimen 

 figured is in a sufficiently advanced stage to give the proof of the import- 

 ant fact that the larva of this species conforms closely with the two other 

 /Irftac/a-larvae hitherto known, viz. of A. lixiila and punciulata. The 



') It may perhaps iiardly be possible to distinguish with certainty the young specimens 

 of A. slellala from those of A. spatuligera; since, however, the latter species is not found to 

 the North of Guayaquil, there can be no (|uestion of the identity of these young specimens 

 from 'I'aboga with A. slellala. 



