35 



figure, and marked it Tchpliorus Umaculatus, perhaps incor- 

 rectly. For the sake of future reference I will call it No. 1. 



P. S. Before you publish the monograph on Tenthredhiidce 

 allow me to consult for you Palisot de Beauvois, who has de- 

 scribed several species, and who makes much use of the little 

 hooks (hamuU) which hold the anterior and posterior wings to- 

 gether, in determining species. 



HARRIS TO HENTZ. 



Milton, Feb. 26, 1828. 

 In my collection are about eighty species of CaraUdce, but 

 I have not been very successful in determining species. Say's 

 genus Sarjmlus is a kind of magazine for doubtful species, sev- 

 eral of which have the apex of the elytra sinuato-emarginate, 

 as you observe in that common and very beautiful species, E. 

 viridis Say, or as Prof. Peck more judiciously named it (from 

 its great variation of hues) jJroteus. I am not sure but that 

 this species may prove to be the viridi-ceneus of Beauvois, 

 whose figure and description correspond very well to our in- 

 sect. Another species, for which I am indebted to you, has 

 the elytra also emarginate at tip. It is a large insect of an 

 ochreous color, and I suppose it to be H. i?ennsylv aniens Say, 

 though it does not agree entirely with De Geer's pennsylvcmi- 

 cus. It certainly is a Rarpcdus, according to Say, for the male 

 has the anterior and intermediate tarsi dilated; whereas in 

 Feronia only the joints of the anterior tarsus are dilated in tlie 

 males. Say's genus Feronia is nevertheless a heterogeneous 

 mixture, a complete i^ot-pourri^ out of which several natural 

 genera may be rescued. Feronia impuncticollis Sa}', is a true 

 Zabrus ; the distinguishing character of that genus is to have 

 the spine, which arms the apex of the anterior tibia within, 

 trifid or triple; Harpalus rusticus is also a Zabrus, while 



