204 Journal New York Entomological Society. [Voi. v. 



through the walls thus left, for the ejectment of the excreta. This ex- 

 crement is shown at the right of Fig. i, also enlarged, and falls down 

 on the outside in more or less broken and detached masses. The larva 

 is, when nearly full grown, certainly less than an inch in length, and 

 the amount of these ejectments were so astonishing that I determined to 

 get some definite idea of the exact amount. We had at the same time 

 two larvae under observation in the Insectary, one working in apple, 

 the other in Witch Hazel, Hamainelis virginiana, and the castings of 

 each were carefully saved during a period of twenty-four hours. In 

 both cases the weight, 0.05 gram, was the same; and placed end to 

 end, the detached pieces measured twenty- four and three-eighths inches 

 in the one case, the other being too much broken to measure correctly, 

 but probably did not differ materially from the first. This is giving an 

 amount of evacuation for each hour from 11.00 a. m. to 11.00 a. m., 

 the period of time covered by the test, amounting to considerably more 

 in length per hour than the length of the larva itself. 



Cyllene picta Drury, has come to have a fondness for Osage orange, 

 Madura aicrantiaca, hardly second to that for the Hickory. From a 

 section of Osage orange fence post, one and one-half feet in length and 

 four inches in diameter, placed in the insectary, there emerged between 

 February 4th and April 14th, twenty-seven individual adults, the 

 greatest number to appear in a single day being four, on February 24th. 

 The beetle is shovvn in Fig. 3, Plate X, while the closely allied species, 

 C. robinicB Forst, which breeds in Robinla pseiidacacia L., is shown in 

 Fig. 4. 



To our knowledge of Cryptorhynchus lapathl Gyll., Plate X, Fig. 

 6, I have little to add, beyond what was given in Journal New York 

 Entomological Society, Vol. V, p. 30. My specimens survived for a 

 time, the last one having died the latter part of November. There was 

 no indication of oviposition, and probably this does not take place until 

 spring, the insect developing to the adult, largely at least, by September. 

 The adults kept, fed daily by puncturing the bark of willow with which 

 they were provided, gouging out the cambium layer. They simply 

 make a hole the size of the beak, and then by circling about excavate a 

 circular cavity under the outer bark. In Europe the species attacks 

 Salix cinerea, S. alba, Popitliis, Betida, Alniis, and Rumex hydro- 

 lapathum, from which last it probably derived its specific name. 



EXPLANATION OF PL.ATE X. 

 Fig. I. Adult, larva, and excreta of the latter, of Oberea biniaculata Oliv. 

 Fig. 2. Section of twig burrowed out by O. biniaculata, showing holes in the walls 

 for ejectment of the excreta of the larva. 



