A NEW SPECIES OF PRABTHIDTR. 



65 



Length : of body, from front of head to apex of abdomen, 67 mm. ; 

 of pronotum, 4^ mm. ; of mesonotum, 5|- mm. ; of elytra, 36 mm. 



Breadth : of metathorax, measured below the elytral prominences, 

 13 mm. 



Hah. Xapury, on the River Acre, Amazon Valley. 



This species appears, on the whole, to be most nearly allied 

 to P. horstokkii, de Haan, but is readily to be distinguished from 



Photo H. Main. 



H. Knight del. 



that species and from all others of the genus by the strong tri- 

 angular process on each side of the metathorax. 



One of the figures is from a drawing made by Mr. Horace 

 Knight to show the insect in what we conceive to be its resting 

 position, with the legs placed, slanting outwards, alongside the 

 body ; the other, from a photograph for which I am indebted to 

 Mr. Hugh Main, represents the insect just as it was received — 

 the middle legs hidden through being tucked in under the body, 

 and the flexible lobes at the sides of the mesothorax and abdomen 

 bent in more than would be quite natural in the living insect. 



