266 On the Elateiidas of Japan. 



Crigmus plebefus. 

 Ludius plebejus, Cand. M6m. Liege, 1873, p. 28. 



Dr. Candfeze included Crigmus in Ludius ; but the form of 



the posterior prosternal process in Ludius (type L. ferru- 

 gineus, L.) will not permit this. In Crigmus (type C. hepa- 

 ticus, Germ.) the prosternal process descends immediately 

 behind the coxeb, and in Ludius it extends horizontally 

 for about half the distance and is then abruptly notched and 

 continued on a lower plane, and this is the case in all true 

 Ludii. In Crigmus also the terminal joint of the antennae is 

 not contracted at the apex, and in C. junior and linteatus it 

 is very elongate. C. plebejus is very similar to C. hepaticus, 

 especially in the elytral sculpture. 



Hab. Nagasaki, Ashiwo, and Sapporo. 



Crigmus Junior. 

 Ludius junior, Cand. M6m. Liege, 1873, p. 27. 



I give a figure showing the outline of the prosternal keel 

 viewed sideways (fig. 4, f , coxal cavity). The great length 

 of the antennas in the male is a distinctive character in this 

 species. 



Ilab. Yuyama, Ichiuchi, Kashiwagi, and Sapporo. 



Crigmus linteatus, 

 Ludius linteattis, Cand. Mem. Liege, 1873, p. 28. 

 Hab. Kobe. Two examples found on Maiyasan in 1871. 



Serious sericarius^ Motsch. 

 Dolerosoma ?, Motsch. Bull. Mosc. 186G, p. 16G. 



The author says this species is similar to D. humeralisj 

 Motsch., but larger ; the elytral striae are crenulate ; it 

 measures 8 millim. I have not seen any insect which 

 answers to the description he gives, unless it is Silesis mus- 

 culuSj Cand. 



[To be continued.] 



