278 GEO. H. HORN, M. D. 



which has been very properly removed and with several other genera 

 since indicated constitutes the tribe Clambini. 



Of the genera of the second division Aglyptus alone has the meso- 

 sternum truly carinate. In some Agathidium the anterior flat portion 

 of the mesosternum is obtusely carinate but not between the coxse. 

 All the others have a plain mesosternum. 



From the characters given by Wollaston it seemed that Stereus 

 should be placed near Cyrtusa or Isoplastus, but I am informed by 

 Mr. Charles 0. Waterhouse of the British Museum, that the tarsi are 

 actually five-jointed on all the feet in both sexes, and that there is no 

 trace of an antennal groove. It seems however to bear the same re- 

 lation to Triarthron that Ani'sotoma ohsoleta does to the other species. 

 I must here acknowledge the courtesy of Mr. Waterhouse in promptly 

 replying to my inquiries, thereby enabling me, even at a late moment, 

 to insert the present paragraph. 



The genus Dietta Sharp, (Ent. Mo. Mag. xiii, p. 78), appears to be 

 very closely allied in its more important characters to Anogdus Lee, 

 but from the description there are certain characters of such an 

 anomalous nature that a second examination seems necessary. The 

 anterior tarsi are said to be four-jointed, the middle and posterior five. 

 The presence of a less number of joints in the anterior tarsi than in 

 the two following is altogether without parallel in the Anisotomini. 

 The " side piece (epimeron) of the prothorax produced behind the 

 coxae, but extremely slender, so as to be only a spine — the two not 

 meeting in the middle," is I suspect one of those cases in which the 

 eyes have been deceived, as all the Anisotomini have the anterior coxae 

 closed behind by the epimera, a fact which is sometimes demonstrable 

 only by the separation of the thorax from the body. The occurrence 

 of only five ventral segments in the Anisotomini is not remarkable as 

 the sixth is often retracted in various genera. The membranaceous 

 clypeus is also observed in Anogdus, Hydnobius and Triarthron, 

 while the antennal structure completely reproduces the former genus. 

 I give place to the genus in the above table on the faith of the 

 characters given by Dr. Sharp, and I have very little doubt that it will 

 prove to be an osculant form between Hydnobius and Anogdus. 



At the time p. 224 was written I had entirely overlooked Dietta 

 until my attention was called to it by Dr. Sharp. It should therefore 

 be added in its proper place and the numbers changed accordingly. 



1 am unable to place Scotocryptus, the characters given by the 

 author being entirely insufl&cient, but it seems allied to Aglyptus. 



