334 Mr. G. U. Waterhouse upon the Nomenclature 



not already separated under generic heads, in the " Manual") ; " all 

 five-jointed," a character that belongs to only one of the species of 

 Ischnopoda, and that stands at the head of the genus. It is true 

 that the Ischn. nificrus and /. altenuata of Stephens' collection, 

 have the same character, but they are the same as his/, longitarsis. 

 Here then '' at least some of the distinctive characters are pointed 

 out," and there is more than " some possibility' of the recognition 

 of the genus, and it was rendered the more easy from the fact that 

 the type of the genus was a perfectly well known insect. 



The wonderful improvements made to the microscope during the 

 last twenty years have given to Entomologists a power of examining 

 minute structure* unknown at former periods, and with this help 

 the structure of the parts of the mouth has been studied in the 

 minute Staphylinidce, and has furnished much help in their classi- 

 fication. As an instance of the minute application of the instru- 

 ment, I will give (from Dr. Kraatz's Naturg. der Ins. Deutschl.) 

 the Latin diagnosis of the two neighbouring genera Calodera and 

 Chilopora. This latter genus is = Ischnopoda, Stephens, it will 

 be recollected. 



Calodera (Mannerh.), Kraatz. 



Maxillae mala interiore intus 

 summo apice spinulis Of lon- 

 gioribus ciliata. 



Ligula brevis bifida. 



Palpi labiales distincte 3-arti- 

 culati, articulo secundo bre- 

 viore. 



Tarsi omnes 5-articulati, postici 

 articulo primo elongato. 



Chilopora, Kraatz. 



Maxillse mala interiore intus 



apice spinulis longioribus 



ciliata. 

 Ligula brevis, bifida, laciniis 



acuminatis. 

 Palpi labiales distincte 3-arti- 



culati, articulo secundo bre- 



viore. 

 Tarsi omnes 5-articulati, postici 



articulo primo elongato. 



Having no doubt of the accuracy of the above definition of the 

 leading characters of Chilopora, I beg to oflTer it to English Ento- 

 mologists, that it may be added to that of Stephens' genus 

 Ischnopoda, and thus render it complete. In the tabulated cha- 



* Stephens' grand instrument (and one he highly valued), for poking into 

 the minute structure of insects, consisted of an extremely minute lens (about three- 

 sixteenths of an inch in diameter) inserted into a round flat bit of brass, about the 

 size of a shilling, and with a short brass handle. I have seen him use it often, 

 and rub his eye afterwards, as well he might. It is now in my possession, but I 

 have never had the courage to use it. 



t The corresponding diagnosis of the genus Ilyobates differs from that of 

 Calodera only in having " 12 " (instead of " 6") in the first paragraph. 



