216 THE CANADIAN ENTOMOLOGIST. 



brood. These larvae, if placed on any flat surface, turn on their backs 

 and begin at once to web the body fast to it, pushing themselves along 

 under the web with the aid of the folds of the body and the jointed 

 appendages of the anal plates. From my observations I believe this to 

 be the purpose for which these appendages are supplied, supplemented at 

 later stages, when its body becomes heavier, by the spinous process 

 placed on the upper anal plate. After falling from the web and seeking 

 to enter the ground, it assumes the normal position, hitching itself along 

 on its ventral surface with the aid of its head and thoracic legs. 



Some of the larvae of the 1901 brood remain unchanged in their cell 

 at this date, June 16th, and, I presume, will not appear as imagoes until the 

 autumn, thus insuring, as do lepidopterous larvae, a perpetuation of the 

 species. 



LARVA OF DATANA FROM ARIZONA IDENTIFIED. 



In the March number of The Canadian Entomologist, page 74, 

 I described a, to me, unknown larva, which, according to a statement of 

 Mr. Win. Beutenmuller, of the American Museum of Natural History 

 of New York, is that of Datana robusta, Strecker. Heretofore the 

 imagoes of I). robusta had all been taken in Texas, and Dr. Dyar in 

 Prof. Packard's Bombycine Moths, Vol. I., page 120, is quoted as saying 

 that the larva of Robusta was yet unknown. Some have claimed that the 

 species described as Robusta too much resembled Perspicua, but it will be 

 seen that the larva is distinct, and the imagines of both these species are 

 entitled to the names as first described. The body colour of Robusta 

 larva is black, and the lines are yellow. Perspicua larva has a body of 

 strata or lemon yellow and eleven pitchy reddish lines in the 3rd or 4th 

 stage, and in the 5th stage the body is of the same colour, but the lines 

 are blackish red, according to Mr. James Angus. In the third stage of 

 Perspicua larva, as described by Dr. Dyar, the body colour is dark red 

 and the stripes bright yellow. 



Mr. Beutenmuller wishes it to be known that he alone is responsible 

 that these two larvae were not turned over to Mr. L. H. Joutel for 

 figuring. He was on the point of departing from the city, and the larvae 

 having already contracted, he did not think they would then serve the 

 purpose. R. E. Kunze, Phcenix, Arizona. 



