Entomological Instruction in France. 335 



who, guided by reason and facts, differed from him ? The 

 truth is, 1st. That, with regard to its northern range, Mr. 

 Stephens, as heretofore, is incorrect in his assumption ; as it 

 extends in Prussia to the parallel of York, and in Russia to 

 that of Edinburgh. 2dly. That those who were personally 

 acquainted with the late Dr. Abbot do not entertain a doubt 

 of the truth of his having taken the specimen that I possess, 

 as stated in the preface to Lepidoptera Britannica (1803); 

 and, 3rdly. It is presumed that Mr. Stephens is too wary to 

 doubt the integrity of the gentleman who took the specimen 

 figured by Mr. Curtis. —J. C. Dale. Dec. 12. 1836. 



" P.S. — From ' a slip of Mr. Stephens's pen* (?), his answer 

 (No. 68. p. 643.) to mine (p. 599.) is dated Oct. 31. 1836; 

 whereas No. 67. (containing my notice) is posterior to that ; 

 viz. Nov. 1836. Another proof of his usual correctness." 



Mr. Gray's Genera of Mactradce. — It is always desirable to 

 publish the characters of new species and genera as soon as 

 they are determined ; since the time of their appearance in 

 print is referred to as deciding the right of priority when 

 different naturalists have described the same things. We have 

 therefore given below the genera into which Mr. Gray divides 

 the Mactradae, being obliged to postpone his paper on that 

 family owing to the cuts, with which it will be illustrated, not 

 being finished. — Ed. 



1. Scissode'sma Gray. Ligament external, in a slit. 



2. Ma'ctra • - Ligament external, in a marginal groove. 



Ligament subexternal, marginal, not separated 

 from the cartilage. 



3. Spi'sula Gray - a. Hinder lateral teeth double and single. 



4. Lutra x ria b. Hinder lateral teeth single or wanting. 



Ligament internal, in the same cavity as the 

 cartilage. 



5. Muli'nia Gray - a. Lateral teeth simple. 



6. Gna'thodon Gray b. Front lateral tooth hatchet-shaped. 



Entomological Instruction in France. — M. Victor Audouin, 

 professor of entomology at the Jardin des Plantes, commenced 

 a course of lectures upon the natural history of insects on 

 April 10. last, continuing it three times each week ; in which 

 he particularly illustrated the natural history of those insects 

 which are obnoxious to agricultural productions, to forest 

 trees, and to horticulture : he also described the habits of the 

 various species which attack domestic animals, and man him- 

 self; closing his lectures with those species which are useful on 

 account of the various products which they yield in medicine, 

 agriculture, or the arts. This course of lectures, so much 

 more interesting than the ordinary routine of entomological 

 lectures, attracted a great number of persons engaged in 

 horticultaral and other similar pursuits, as well as many 



