478 ENTOMOLOGICAL NEWS [Dec., '14 



The genitalia are of great importance in differentiating species. 

 These were largely used by Scudder in his work. In certain 

 forms the genitalia are moderately variable. 



Meeting of May 28, 1914. Mr. Philip Laurent, Director, 

 presided. Ten persons were present. 



Dr. Calvert exhibited some colored drawings which he had 

 made from living males of Anisagrion allopterum Selys (Odo- 

 nata) in Costa Rica, which illustrate what he believes to be 

 changes in color accompanying advancing age of the imago. 

 The recently transformed individuals with softer chitin and 

 no pruinosity are predominantly pale cinnamon brown. Those 

 with firm chitin and some pruinosity are chiefly black. Both 

 these extremes, as well as many intermediates, were obtained 

 in the vicinity of Cartago. The pale brown forms were de- 

 scribed by Selys as variety rubicundum. The speaker had sug- 

 gested in the Biologia Centr all- Americana that such color 

 changes as above indicated probably occurred in this species, 

 but he did not then have the evidence in support of this view 

 which he now possesses. If this be correct, Anisagrion allop- 

 terum furnishes a parallel to other species of that genus and 

 to Hesperagrion heterodo.vum whose color changes have been 

 described in the Biologia. 



Dr. Calvert also exhibited a few Costa Rican Dynastine 

 Scarabaeidae (Coleop.) showing marked development of the 

 cephalic or prothoracic horns and, after remarking on the very 

 scanty information which exists as to the functions of these 

 horns, read the verbatim statements of such observations which 

 have been recorded for this group in different parts of the 

 world. These indicate that in different species the horns are 

 used as weapons, as instruments for scraping through bark, 

 for anchoring the beetle, or for carrying the female. Photo- 

 graphs from a living male of Dynast cs per sens which had been 

 kept in a room in Cartago, Costa Rica, for a month, feeding 

 on sugar cane, were also shown. 



Mr. Laurent showed some cocoons of Callosoinia angnlifcra 

 that had holes in them that he thought were made by wood 

 mice. 



