546 ENTOMOLOGICAL NEWS. [September, 



habiting Illinois, does not appear to have yet been found in Indiana or 

 Ohio. (I hope to shortly publish a brief paper on this question, giving 

 the specific distinctions of f rater mis, crassus and externus.} Four of the 

 plates of the work under notice illustrate structure and the use of terms ; 

 the other three figure specific characters of Enallagma, Gomphus, Lestes, 

 Argia, j&schna and Sympetrum. Altogether, Mr. Williamson's work is 

 very good. 



One would not ordinarily look in a paper on "Odonaten aus New- 

 Guinea" (49) for the description of a new genus from North America. 

 Herr F. Forster has doubtless included it, however, for the sake of com- 

 parison with a certain Papuan form. The new genus in question is 

 Nasiceschna^ erected for ^Eschna pentacantha Rambur. The diagnosis 

 is in French, from the pen of Baron de Selys-Longchamps. The name 

 refers to the character of the nasus, which is greatly excavated. The re- 

 lationship is stated to be with Epiczschna, Brachytron and Acanth&schna. 



P. P. CALVERT. 



<> 



DEPARTMENT OF EGONOMIE ENTOMOLOGY. 



Edited by Prof. JOHN B, SMITH, Sc. D., New Brunswick, N, J, 



Papers for this department are solicited. They should be sent to the editor 

 Prof. John B. Smith, Sc.D., New Brunswick, N. J. 



FISH OIL SOAP FOR THE ROSE BUG. 

 Macrodactylus subspinosus Fab. 



In ENT. NEWS, Vol. XI, p. 373, Prof. J. B. Smith records his suspicion 

 that a solution of one-half pound of fish oil soap in a gallon of water will 

 not kill the rose bug, Macrodactylus subspinosus, as reported on p. 70 of 

 Bull. 20, N. S., Div. Ent, U. S. Dept. of Agric. 



It was my privilege to make the test under Prof. Webster's direction, 

 and hence I am quite familiar with details. 



The destruction of the females was a surprise. I " examined closely " 

 and found that the females greatly distended with eggs were the most 

 susceptible they were not "worn-out specimens." The males and newly 

 emerged females were the most important. If you observe closely, you 

 will find that in the distended females the spiracles are exposed. In the 

 males and newly emerged females the spiracles are covered by the elytra. 

 But as they struggle about to escape, the solution reaches the spiracles 

 and they die in a short time. As pointed out in the discussion at Colum- 

 bus, this fact is quite significant and makes further explanation unneces- 

 sary. The spray was not "an impalpable mist." As the beetles cluster 

 preferably on the blossoms and the fruit, the spray was turned directly 

 upon them, thus giving them a more thorough wetting than in ordinary 

 spraying a tree. C. W. MALLY, Cape Town, So. Africa. 



t Ought not this to be Rkinaeschna - P. P. C. 



