136 HYMENOPTERA. 



sixth, I found the larvae in some numbers feeding upon 

 the alder, near Poole, in Dorsetshire ; the larvae all fed up 

 by the 20th of the month, and buried themselves in mould 

 in a flower-pot ; about the middle of September they began 

 to appear in their imago state, and by the end of the month 

 all were developed; I succeeded in breeding twenty-two 

 specimens. 



In the work above referred to, a coloured figure of the 

 larva is given, and which is said to be one of extreme accu- 

 racy ; as this differs materially from those which I found, I 

 add the following description: — 



Description of the larva of Croesus septentrionalis, — The 

 caterpillar, when full grown, one inch in length: 



Livid-green ; the head black ; ten narrow transverse 

 stripes on the back ; with eleven round black spots on the 

 sides, and a double row of ovate ones outside the black spots ; 

 a triangular black spot above, at the apex of the body; tinted 

 with yellow towards the head, and also towards the apex. 

 With three pairs of articulated legs, and six pairs of fleshy 

 prolegs. 



In the " Annual " for 1864, I have reported the capture of 

 Hemichroa Alni, in company with Eriocampa ovatOj and 

 I there stated that all the examples that I had seen of the 

 former insect were males ; such I had really believed them 

 to be ; the fact of this species being furnished with two seti- 

 ferous appendages, which in some species characterize the 

 males, misled me ; my friend Mr. M^Lachlan detected 

 the error ; I therefore take this opportunity of rectifying as 

 far as possible this egregious oversight. All the specimens 

 of Hemichroa that I have seen are females; this leaves the 

 problem as to the male o^ JEriocampa ovata just where it 

 was ; the female is a common insect in this country as well 

 as on the Continent, but no one appears to know the male. 



