34 Lake Maxinkuckee, Physical and Biological Survey 



siderable interest. The most interesting of the beetles in the lake 

 is a little creature belonging to the genus Stenelmis that lives in 

 the masses of lime or marl or algse which grow on the exposed 

 ends of the freshwater n)ussels living in the lake. This growth or 

 deposit is most marked on the shells of LaurpsiUs luteola which is 

 the most abundant species of mussel in the lake. These mussels 

 burrow more or less in the mud or sand, leaving usually one-tenth 

 to one-fifth of the posterior end exposed to the water. Upon this 

 exposed portion a mass of lime and algse slowly accumulates and 

 finally becomes one-fourth to one-half inch thick. In this mass 

 the little beetle, recently described as new by Professor W. S. 

 Blatchley from collections made by us and named by him Stenelmis 

 snlcatns, is quite common ; a collection of 20 to 30 mussels would 

 furnish 50 to 100 examples of the species. Specimens have been 

 found in similar masses on rocks in the lake, and it probably 

 occurs on other species of mussels though we have found none on 

 any except Lampsilis luteola. 



Click-beetles, especially the large conspicuous eyed Elater, Alaus 

 oculatus, were seen occasionally. The beautifully phosphorescent 

 larva of one was obtained at night on Long Point June 28, 1901. 



The fireflies or Lampyrids were exceedingly abundant in low 

 grassy places, flashing everywhere at night. The phosphorescent 

 larvae were abundant in the grass along the Inlet. 



A few stag-beetles were seen on Long Point. 



Snout Beetles, especially acorn weevils, were common, and most 

 acorns were attacked. One was seen on an acorn, and a snout- 

 beetle was seen June 7, 1901, with patches of eggs, on the tip of 

 a bulrush. 



The only species of beetles represented in our collections are 

 the following: 



Stenelmis sulcatus Blatchley 



Dytiscus hybridus Aube. 



Ihjhius biguttulus Germ. 



Acilius fraternus Harris 



Tropisternus glaher Herbst. 



Photuris pennsylvanica DeG. ; larvse. 



Dineutes sp; larvse. 



Psephenus lecontei Lee 



Cicindella sp. 



Melasoma interrupta 



