of Petalocerous Insects, 15T 



rali signato : femoribus posticis incrassatis arcuatis ; 

 tarsis posticis longissimis : palpis maxillaribus elongatis 

 articulo extimo baud foveato. Ex. Trichius Delta, 



***** Euclidii, Sparsim squamulosi : podice utrinque, capite, 

 femoribus extra, prothorace antice, acuductis ; hoc tri- 

 angulo aequilaterali impresso, cubito tridentato : palpis 

 articulo extimo baud foveato, Ex. Trichius Triari' 

 gulum. * 



****** Jleurosticti, Subtus hirti : elytris nitidis, abdominis 

 lateribus, elytris et podice emarginato farinoso-guttatis ; 

 prothorace canaliculato. Palpis articulo extimo subfo- 

 veato. Ex. Trichius nobilis^ octopunctatus^ &c, 



******* Gymnodi. Fere nudi, immacuiati : naso apice rotun- 

 dato vel truncato ; scutello triangulum isoscelem figur- 

 ante : antepectore transverse plicato : palpis articulo ex- 

 timo supra excavato, oblongo, compresso. Ex. Trichius 

 Eremita and others undescribed from North America. 



Instead of giving the denominations of the subgenera a feminine 

 termination as proposed in the Introduction to Entomology, I 

 have followed the gender of the genus, which appears to me best. 

 Should any of these, upon further examination, appear more than 

 subgenera, it will be easy to alter the name to the singular. 



Mr. W. S. MacLeay has observed with regard to Trichius faS" 

 ciatus, how much in its general appearance and mode of flight it 

 resembles a wasp or some hymenopterous insect. J This observa- 

 tion may be extended to several other beetles, especially to many 

 of Latreille's Anthobii ; some species of Amphicoma and Aniso- 

 nyx so closely resembling humble-bees as to be scarcely distin- 

 guishable from them, another proof of those remarkable analogies 

 where there is no affinity, that meet us wherever we turn to 

 observe natural objects. As the hairy Hymenoptera are useful 

 in fertilizing flowers, by transporting upon their hirsuties, far and 

 wide, the farina fecundans, so these beetles probably answer the 

 same useful purpose, as has been well remarked by the learned 

 author just named.t Some of these flower-frequenting Petalocera 



* Linn, Trans, xii. 408. n. 46. Introd. to Ento, iii. 368. D. 2. X Hor<E, 

 Entomolog, 78. + Ibid, 77^ 



