140 



from tlie lai'vtB, would be : — spinners, transforming in silken 

 cocoons ; body generally hairy, sometimes smooth, mostly 

 tuberculated, the hairs arising from the tubercles, and dis- 

 posed in stellated clusters or tufts. Antennae of the winged 

 insect, for the most part, fully pectinated on both sides, at 

 least in the males. Pseudo-Bomhyces : — imperfect spinners, 

 transforming generally in cocoons formed of a gummy matter, 

 which becomes more or less membranous or jjaper-like, some- 

 times changing without making a cocoon ; body mostly naked, 

 or sparingly hairy, sometimes tuberculated, the tubercles not 

 setiferous, and the hairs (when tiiere are any) arising immedi- 

 ately from the skin, and not from tubercles. Antennse of the 

 perfect insect seldom fully pectinated to the tip in the males, 

 often simple in the females. Other characters may be added, 

 but it is difficult to generalize in this way, for the exceptions 

 will always multiply in the formation of large groups. You 

 will not suppose that I think these two series should follow each 

 other, but rather that they are parallel, and both begin and end 

 at the same point, running together or coalescing at their ex- 

 tremities. 



None of the Sphinges described in your letter are known to 

 me. One of the larvoo sketched in youi- letter is named " Ps. 

 epiminis " by you. From its form I should have supposed it to 

 be rather my Cyphocampa. Is there not some mistake about 

 the name ? 



DOUBLEDAY TO HARRIS. 



[Without date; received March 9, 1840.] 



I am going to start two difficulties ; the first, the transit from 

 Psyche to Bomhyx ; the second, as to the j)lace of Limacodes. 

 I must freely confess that I caimot find any better location for 

 them, yet I cannot quite reconcile myself to their present sta- 

 tion. In regard to the Psyclildce^ I must also tell you that the 



