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Genus. Macrosoma, Hope. 

 Type of the Genus. Melolontiia glacialis, Fah. 



Lahrum rotun datum subemargiiiatum. 

 Antennce clava elongato-ovata. 

 Thorax antice angustus postice parum latior. 

 Corpus elongatum, elytris thoracc quadruple 

 longioribus. 



Cubitus 3-dentatus. 



To this genus may be added Mel. lurida striata 

 and testacea of Fabricius. Two of the species 

 described by him have the posterior margin of the 

 thorax sinuated, particularly opposite the scutellum. 

 Mel. Areata differs slightly from the other species 

 in this respect. My zealous entomological friend, 

 Mr. Charles Darwin, of Shrewsbury, (among various 

 Zoological treasures obtained durino- his interesting- 

 voyage, now on the eve of publication) has brought 

 with him from Terra del Fuego, a valuable collection 

 of insects, among which are some species of Ma- 

 crosoma, and I hope, at a future time, to detail the 

 generic characters more fully than I have been able 

 to do from the specimens in the Banksian collection, 

 which probably reached this country in a mutilated 

 state. 



