THE CAUSE or MIMETIC RESEMBLAKCE. 591 



Fig. 3. Fig. 4. 



Fig. 3 ( X 3). — An ant-like Bast-Afj-ican Heinipterous insect, Myrmoplasta myra 

 (Gerst.), seen from above and from the left side. (From Gerstaecker, 

 Article 6, Hemiptera, p. 9, in Fr. Stuhlmann's Zool. Ergeb. 1888- 

 1890, Berlin 1893.) 



Fig. 4. — An ant-like N.- American beetle, Eudeixes -pici-pes (Fab.), seen from 

 above and from the right side. 



(Zool. Ergeb. einer Eeise in Ost-Afrika, Fr. Stuhlmann, Bd. I. 

 no. ix. 2 ; Article 6, Hemiptera, p. 9 : Dietrich Eeiiner, Berlin, 

 1893). 



Among Coleoptera the resemblance to ants is very common. I 

 select as an example a little Longicorn {Euderces picipes, Fab.), 

 ■wbicli I found very abundantly upon the heads of Umbelliferous 

 plants at Pine Lake, Hartland, "Wisconsin, in July and August 

 1897, when visiting Dr. C. A. Leuthstrom. Ants were also very 

 common on the same flower-heads. The appearance and move- 

 ments of the beetles were extremely ant -like, the suggestion of 

 a stalked abdomen being conveyed by an oblique white line 

 crossing the elytra in a very shallow depression in which the 

 dark ground-colour of the insect appeared to be of a more intense 

 black than elsewhere. The increased darkness was in reality 



42* 



