99 



pushed on. The latter soon became a mere pencil, and when 

 the skin was entirely filled it had disappeared^ It remained 

 distended a few seconds, and was then withdrawn ; this was re- 

 peated several times in rapid succession. 



After discovering these organs in acrasa, I examined every 

 species of Lepidoptera captured, in the hope of finding analo- 

 gous ones in them. I was successful in the following three 

 species : Danais erippus Cr., Agrotis plecta Linn., and Euplexia 

 lucipara Linn. In the former the organs, though much smaller 

 than in acraea, were similar in form, and also clothed with scat- 

 tered fine hair. But their position was very different ; they 

 were situated above, and one on each side of the anal parts, 

 instead of beneath them. In plecta and lucipara they were in 

 precisely the same position as in acrasa, but entirely dissimilar 

 in form. In plecta they consisted, when distended, of a single, 

 short (1.5 millim.) protuberance, thickly clothed and concealed 

 by a dense bush of fine radiating hair ; it returned into the 

 abdomen in the same manner as in acrasa. 



This structure is peculiar to the male sex, and is presumably 

 connected in some way with the act of generation. As all the 

 species which possess it are common, it is to be hoped that next 

 season observations will be made upon it, which will help to 

 determine its true function. H. K. Morrison. 



List of Coleoptera collected in the vicinity of Clif- 

 tondale, Mass., June 12, 1873. 



(Continued from page 18.) 



Collops tricolor Say. 

 Pseudebceus oblilus Lee. 

 Thanasimus nigrifrons Say. 



" thoracicus Oliv. 



Hydnocera humeralis Say. 

 Eucrwla humeralis Mels. 

 Asemutn mosstum Hald. 

 Criocephalus australis Lee. 



Rare in this vicinity. 

 Phymatodes variabilis Fabr. 



" varius Fabr. 



CalUdium antennatum Newm. 

 Molorchus bimaculatus Say. 

 Ncoclytus erythrocephalus F. 

 Clytanthus ruricola Oliv. 

 Leptura lineola Say. 



