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XVII. Oil the genus Theodosia ami other Eastern Golia- 

 tliides, wiVA descrvptions of some nevj species. By 

 Oliver E. Janson, F.E.S. 



[Read June 3id, 1903.] 



Theodosia, Thorns. 



Wcstwoodia, Cast., HcHonica, Thorns., Atopocerus, Kz. 



This genus Avas established by Castelnau in 1878 imder 

 the name of Wcstwoodia, with hoicitti, Cast., as its type. 

 His generic name being preoccupied, Thomson in 1880 

 substituted that of Theodosia and at the same time erected 

 what he considered a distinct genus, Helionica, for the 

 reception of the species westwoodi, Thorns. ; the characters, 

 however, that he relied upon to separate it from Theodosia 

 are certainly not of generic value, and the two genera 

 must therefore be merged into one. In 1888 Kraatz, 

 evidently ignorant of the fact that Thomson had already 

 eight years previously re-named the genus, published the 

 name Atopocerus as a substitute for the preoccupied one 

 of Wcstwoodia, his name therefore must also be sunk as 

 a synonym. 



The genus is very closely allied to Fhiedimus, Waterh., 

 of which the type is cumingi, Waterh., and Bates has 

 regarded them as generically inseparable, but this view 

 has not been adopted by subsequent authors, and I 

 certainly think they are sufficiently distinct to warrant 

 separation ; besides a very different general facies and some 

 minor characters, in the male of all the Theodosia species 

 the head is flat with the horn arising from the extreme 

 front margin of the clypeus, the thorax has no distinct 

 lateral margin on the anterior part to separate the upper 

 and under surfaces, and the horn is formed as a prolonga- 

 tion of the exceedingly convex disk, the anterior tarsi are 

 also slender and longer than tlie tibife, whereas in Phmlimus 

 the head is excavated and has the clypeus projecting 

 beyond the base of the horn, the thorax is strongly and 

 completely margined at the sides and with the horn arising 

 from close to the anterior margin, and the anterior tarsi 

 are stout and distinctly shorter than the tibiae. 



TRANS. ENT. SOC. LOND. 1903. — PART III, (OCT.) ^1 



