34 WHIRLIGIG BEETLES. 



Cosmia frapezina, abundant ; C. diffinis, common ; C. affitiis, 



common. 

 Dianthecia cucubali, one specimen. 

 Hecatera serejia, two specimens. 

 Miselia oxyacanthcB. 

 Phlogophora meticulosa. 

 Eiiplexia lucipa}'a, six specimens. 

 Epuiida nigra. 

 Hadena protetis, If. denttna, H. chenopodii, H. oleracea, H. 



thalassina. 

 Caloampa vetusia, one specimen. 

 Abrostola hiplasta, very common. 

 Flusia palchrina, one specimen; P. gamma, P. iota, P. 



chrysitis, three specimens. 

 Gonoptera libatrix. 



Amphipyra pyramidea, two specimens ; A. tragopogonis. 

 Mania jnama, six specimens; M. typica. 

 Catocala ntipta, abundant. 



Mbirlicjio Bcctlce. 



By Robert Gillo. 



Plate II. 



EVERYBODY most probably know the WhirHgig Beetles, yet 

 perhaps few have ever examined them. I will therefore 

 endeavour to describe what I think to be some of the 

 principal features of their external structure, together with a short 

 notice of the various species that inhabit Britain and constitute 

 the genus Gyrinus. Even the most casual observer cannot have 

 failed to observe that they are quite unlike any other of the water 

 beetles ; hence, in classification they stand alone and without any 

 connecting links between them and the more usual forms of 

 Aquatic Coleoptera, of which we may take the Dytiscus or Acilius 

 as types. 



