256 journal of economic entomology [vol. 9 



Distribution of Species 

 Species of Lachnosterna Captured at Trap Lights 

 A Comparative Table on a Basis of 10,000 Beetles 



Lan- 30 mi.. .Dodge- 40mi Bara- 50mi.. .Ripon 



caster ville . . 35 mi. . . . Madison . . 35 mi. . . boo 



No. beetles caught. . . 440,000 271,600 ? 110,285 14,519 



No. beetles identified 12,246 16,268 10,839 16,847 14,519 



L. fusca 9,669 9,328 3,903 934 1,290 



L. rugosa 1 5,967 8,483 7,628 



L. grandis 83 4 59 12 959 



L. dubia 20 6 7 547 111 



L. hirticula 25 225 4 4 



L. gibbosa 47 251 4 2 



L. ilicis 33 173 19 10 



L. balia 52 1 10 



L. tristis 29 2 



L. nitida 15 4 7 1 2 



L. implicita 19 1 



L. marginalis 3 1 30 



Other species 5 6 4 6 3 



(L. vehemens, nova, prunina, inversa, villifrons) 



As will be seen by the accompanying table, there is a remarkable 

 variation in distribution of species within a short distance of thirty 

 or forty miles. Seventeen of the nineteen species known to occur 

 in Wisconsin were taken in these traps. Mr. J. J. Davis adds L. hornii 

 and L. crenulata}, collected at Baraboo June 2, 1914, and a specimen 

 •of L. crenulata from Milwaukee County is also in the Milwaukee 

 Museum. Not less than 10,839 specimens were determined for any 

 station, ranging upward to 16,847^ — at Baraboo. The entire catch at 

 Ripon has been determined specifically .^ 



In this comparative table computed on a basis of 10,000 beetles, it 

 is seen that L. fusca is more cosmopolitan than any other species 

 and' is dominant at Lancaster and Dodgeville. L. rugosa did not 

 appear at Lancaster, the southwest station, but is dominant at the 

 three northeasterly stations. 



L. implicita, which was found most abundant by Dr. S. A. Forbes in 

 Illinois in 1906, is rare at Lancaster and did not appear elsewhere 

 except a lone specimen out of 14,519 determined from Ripon. 



Only males of L. gibbosa and L. nitida were attracted to our lantern 

 traps, and L. tristis also is but slightly attracted. 



1 After this paper was sent to the editor three specimens of L. crenulata were 

 found in the trap collections from Baraboo. 



2 Much praise is due Mr. Neale F. Howard, now assistant at the Ohio State Univer- 

 sity, Mr. Stewart Chandler and Mr. T. T. Haack for their great care and painstaking 

 efforts in determining all but a few of these specimens. The rarer species have been 

 passed upon by Mr. J. J. Davis. 



