472 M. straus-durckheim's 



the extremity of the one part is not received by a cavity of the 

 other, being simply united by a circular dermoid membrane. 

 (M. Straus terms this Articulation a tiles disjointcs.) 



9. Ginglymus, where there exists but a motion in one direc- 

 tion, as that of a hinge. 



10. Two solid parts are sometimes separated by a space so 

 thin as to permit a greater or less degree of motion to the 

 two solid portions. This, which though equivalent to, cannot 

 be considered as, a real articulation, may be termed, movement 

 by flexion. 



Section II. 



Structure of the Teguments in Melolontha vulgaris. 



In the last section I have endeavoured to give a much 

 fuller and more regular abridgement of our author than it is 

 my intention to do in the present one ; but my friend, Newman, 

 being now engaged in elucidating the external anatomy of 

 insects, it would be occupying too much of your Magazine 

 with one subject, were I to venture much on the same ground 

 with him ; and, moreover, some one, knowing how far more 

 able he is than I am to undertake such a subject, might remind 

 me of Boileau's lines : — 



Un ane, pour le moins instruit par la Nature 

 A I'instinct qui le guide obeit sans murmure, 

 Ne va point follement de sa bizarre voix, 

 D^fier aux chansons les oiseaux de la bois. 



I shall, therefore, confine myself to pointing out M. Straus's 

 terminology of the different parts, in as few words as possible, 

 just noticing any of his remarks calculated to throw light on 

 the subject of systematic arrangement. I had intended to give 

 also Kirby's nomenclature of the different parts ; but, on a re- 

 examination of the third and fourth volumes of his Introduction 

 to Entomology, I found so much confusion in the nomenclature, 

 a certain indistinctness and unintelligibleness in the plates, that, 

 fearful of misleading, I almost entirely gave up this idea. I 

 trust, however, that this subject has now fallen into the hands 

 of one who will not abandon it until he has furnished us with 

 a clear and intelligible nomenclature ; every one who has 

 consulted works giving detailed characters, particularly Mr. 

 Curtis's, in which the dissections are so beautiful and accurate, 



