130 



be referred to willingi but until the 9 of this has been bred it is 

 impossible to make any definite statements. 



With regard to the larvae, our figures on Plate V, Figs. 5 and 6 

 of the revision are correct ; we would call attention to the distinct 

 diflferences in the dorsal tufts which are clearly visible in the photo- 

 graphs. In the text (pp. 63 and 64) instead of "segment 11" should 

 be substituted "segment 11" and we would point out that there actually 

 is in willingi a small dorsal hair pencil arising out of the raised tuft 

 on this segiTient but the hairs forming it are very apt to be rubbed 

 off when the larvae crawls around and it is only in freshly moulted 

 individuals that it is clearly visible. We append a description of both 

 larvae drawn up from the living specimens : 



O. VAGANS (mature larva). 



Head black. Body dull gray-black marbled with white with coral-colored 

 eversible glands; two anterior and two posterior lateral black hair pencils; 

 eighth abdominal segment (seg. 11) with a dorsal tuft of black hair surrounded 

 at the base by white feathery hairs; subdorsal rosettes of similar white hair on 

 meso- and metathorax and on abdominal segments 5-7; first four abdominal 

 segments with heavy light-brown dorsal tufts intermingled sparsely with white; 

 lateral rosettes of short white plumed hairs on all the segments; subspiracular 

 tufts of long white plumed hair, each tuft with a central black plumed hair 

 which is occasionally double; on the meso- and metathorax the number of 

 black hairs is normally 2-3. 



O. WILLINGI (mature larva). 



Head black. Body and lateral black hair pencils as in the preceding; 

 8th abdominal segment with a fine black hair pencil arising out of the dorsal 

 tuft; the dorsal tufts on abdominal segments 1-4 are mouse gray without an 

 admixture of white hairs except that they are bordered laterally by the usual 

 white rosettes which occur further on the meso- and metathorax and on 

 abdominal segments 5-7; the prothoracic hairs are quite characteristically tinged 

 with ochreous; the lateral and subspiracular ttifts are pale gray, the hairs 

 being much less plumed than in the preceding species; the central black hair 

 is also merely barbed, not plumed. 



The distinctions in the color and quality of the hair can be readily 

 seen in the cocoons which are formed of the larval hairs loosely spun 

 together; that of vagans is much deeper in color and lacks the slight 

 ochreous tinge found in willingi cocoon. 



With regard to our figures in the revision on Plate III, we might 

 say that the type (Fig. 1) does not show the close approximation 



