Jan., 1908.] The Ohio Species of the Genus Disonycha. 
427 
D. mellicollis. Say. Oval, similar in form to xanthomelaena. Head 
blue-black between the eyes and posteriorly, front yellow, a few deep 
coarse punctures near each eye. Thorax pale yellow. Prothorax yel¬ 
low beneath, metathorax piceous, abdomen piceous at the middle with 
apical segment and wide border yellowish. Femora entirely yellow; 
tibia piceous; paler at the base; tarsi piceous. Length 4.5-5. mm. 
Occurs in Louisiana, Texas and Colorado. Also reported 
from Cincinnati, Ohio. 
D. collata. Fab. Oval, slightly oblong, sub-depressed. Vertex and occi¬ 
put black, front yellow, a few coarse punctures close to the eyes. 
Thorax yellow, immaculate. Prothorax beneath yellow, metasternum 
black. Abdomen piceous with the last segment and sides broadly 
yellowish, densely punctured with a distinct pubescence. Femora 
pale yellow, tibia at tips and tarsi piceous. Length 4.-4.5 mm. 
Occurs in Georgia and Florida. Reported from Cincinnati, 0. 
Life History Studies. 
While at the Ohio State University Lake Laboratory at 
Sandusky the past summer, opportunity was afforded to do 
some work on the life history of D. quinquevittata, the life cycle 
of which species, as far as I am aware has never been studied. 
Fig. 1. Disonycha quinquevittata 
Dorsal and ventral view of adultbeetle, 
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The beetles and larvae in this region feed upon a small scrub 
willow, Salix interior, which grows in rather isolated and well 
defined patches on the sand plain on the lake side of Cedar Point, 
and when I arrived at the Laboratorv about the 25th of June, 
the beetles were quite abundant, and some larvae were found 
although not as many as later on. 
