M. Kupffer's Notice of some rectnt Magnetical Discoveries. l29 



13. Paramesius, Westw. 



Cirieto genuino affinis. Caput siibquadratiim tuberculo anticoj antennas 

 $ corpore toto longiores, graciles, filiformes, 13-articulatae, articulis longi- 

 tudine subEequalibus (2do 3tioque miiiutis exceptis) articulo 4to ad basin 

 minime excise; abdomen elongate- clavatum, petiolo tertiam partem longi- 

 tudine aequante, alarum nervi ut in Cineto gracUipede (Curt. Brit. Ent. 

 380. fig. 9.J at areola marginalis paullo longior et basi truncata est. — Par. 

 rufipes, Westw. Niger, nitidus, antennis fuscis, pedibus rufis. 



14. Ancurhynchus^ Westw. 



Galeso afEni?. Caput transversum tubercido brevi antico, trophis brevibus, 

 antennfB $ vix corporis longitudine, filiformes, 14-articulat£E, articulo Inio 

 simplici, 2do minuto, Stio tenui, et puullo longiori, 4to crassiori, et ad 

 basin extern^ minime exciso. Alse stigmate nullo distincto, sod nervo sub- 

 costali basali, cujus apex alarum marginem anticum non attinet sed oblique 

 in alarum disco, breviter protenditur, inile ad alarum apicem reflectitur 

 areolam marginalem elongatam efformante, nervi reliqui ut in Cineto gi-aci- 

 lipede. — An. galesiformis, Westw. Niger nitidus, antennarum articulo 2do 

 pedibusque rufo-piceis, femoribus basi obscurioribus, alls pallid^ fuscescen- 

 tibus. 



15. Spilomicrus, Westw. 



Subgenus Diapriam cum Galeso connectens. Caput transverso-quadratum. 

 Antennae 9 capite thoraceque paullo longiores, IS-articulatae, ad apicem 

 sensim incrassatae; alae stigmate parvo ante medium alarum, quadrato, 

 apice intern^ deflexo, ramulum parvum, versus basin alarum reflexum, 

 emittente; areola basali subtriangulari; nervi reliqui fer^ ut in Paramesio, 

 at indistinctissimi. Metathorax utrinque postice spinosus. Femora cla- 

 vata, pedunculus abdominis mediocris, striatus. — Spil. .ttigmaticalis, Westw. 

 Niger nitidus, pedibus obscure piceis, alis pallide flavescenti-fiiscis, stigmate 

 njgro. 



Y6. Bpt/ns, W^estw. 



Bethi/Uo affiiie. Caput mediocre subconvexum; antenna; elongatae filiformes 

 1.3-articulata2, articulo singulo cylindrico nee ad basin tenuiori. Thorax 

 elongato-ovatus. Metathorax supra longitudinaliter 3-carinatum. Alas 

 areola unicii apicali longiori incomplete areolisque duabus basalibus longi- 

 tudine aequalibus. — Epyr. nigcr, Westw. Niger, abdomine nitido, tihiis 

 tarsisque pliis minusve piceis. 



XXVIII. Notice of some recent Magnetical Discoveries. By 

 M. A. KuPFFER, of the Imperial Academy of St. Fetejs- 

 burgs ina Letter to Sir David Brewster, K.H. LL.D. S;c. 



tyy means of a number of experiments continued during the 

 ^^ gr-eater part of tiie winter oi" 1831, I have found that the 

 intensity of the magnetic forces, in bars of steel, is diminished 

 as much by the action of cohJ as by that of heat : I speak 

 here of that part of the magnetic intensity which is lost when 

 we e?(pose a magnetized bar to a temperature higher thjxn any 

 which it has experienced since it was magnetized, and wliich 

 is no longer found after cooling. I have hence adopted a 

 more satisfactory method to procure magnetized cylinders of 

 Third Series. Vol. 1. No. 2. Am. 1832. S 



