238 [October, 



divergent veins, instead of the three veins (one thick, two very thin) 

 that are found in other genera of Longicorn Coleoptera of the sub- 

 family Ceramhycides. 



The three genera of Plagithmy sides are very readily distinguished : 



1. Hind femora gradually much dilated from the base to the tip, and here densely 



set with velvety tomentum. Callithmysus, n. g. Type, and only species, 

 Clytarlus microgaster, Sharp. 



2. Hind femora slender at the base, but becoming rapidly larger so as to form an 



elongate thick process, longer than the basal thick part. Front coxae dis- 

 tinctly separated. Gen. Flagithmysus, Motsch. Type, P. pulverulentus, 

 Motsch. 



3. Hind femora vrith an elongate, thin basal stalk, becoming larger in such a vcay 



as to form a well-defined terminal head, or capitulum, not longer than the 

 stalk. Front coxae separated only by a slender lamina. Gen. Clytarlus, 

 Shp. Type, C.fragilis, Shp. 



This latter genus will include several other species, but as the 

 material we have received is not so ample as that representing Plagiih- 

 inysus, and as it may probably be further, and considerably, augmented, 

 I do not propose to deal with it here. 



PLAGITHMYSUS. 



Flagithmysus, Motsch., Bull. Mosc, 1845, Pt. IT, p. 41 ; Sharp, C. R. 



Ent. Soc. Belgique, July, 1885, p. Ixxiv. 



The genus Plagithmy sus was established by Motschoulsky for a 

 species which he said was found in California by Eschscholtz. This was 

 certainly erroneous. Eschscholtz went to the Hawaiian islands as well 

 as to California during his journey round the world with Kotzebue, 

 and it was doubtless there that he procured P. pulveruletitus described 

 by Motschoulsky some twelve or fifteen years subsequent to the 

 death of the traveller. P. pulverulentus is well known in the islands, 

 but nothing like it has ever occurred in California, and the genus has 

 been rejected from the North American faunistic lists. 



In 1835 Boisduval described, in the Faune de I'Oceanie, p. 485, a 

 Longicorn beetle under the name of Clytus attenuatus that he said 

 inhabited " Nouvelle Hollande ;" this insect has been, and no doubt 

 correctly, referred to the genus Plagithnysiis by Lacordaire. There 

 can be no doubt that it also came from the Hawaiian islands, though 

 Chevrolat subsequently did all he could to make confusion more 

 confounded, by stating that the locality of Clytus attenuatus was 

 New Zealand, and that it was probably the same as the New 

 Zealand (Emona humilis, Newm., an insect to which C. attenuatus has 



