OF THE G, LOMAPTEBA. 149 



place with the forceps of Dr. Kraatz's xanthopus, will be best 

 elucidated by that author himself. 



Thereupon I prepared the forceps of a great number of other species 

 and I found these four types remarkably constant, offering slight 

 specific modifications only. — On the first survey there seems to 

 be a great difference between the forceps of the large Th. striatus 

 Wall, and the small Th. pulhis Billb. , but in reality both are 

 constructed following the same type. 



As soon as I had this constant internal character, I ventured 

 to find it allied with some constant external characters, and after 

 a careful examination of a great number of species I happily re- 

 cognized that each of the forceps types corresponded with a pecu- 

 liar type of pygidium (fig. \a , 2« , 3« . ^a) , a peculiar type of 

 mesosternal process (fig. li, %, 3i, 45) and a peculiar type of 

 general form (fig. Ic, 2c, 3c, 4c). 



It will be hardly necessary to point out that all these parts are 

 subject to various specific modifications; so is for example the 

 mesosternal process of L. subarouensis Thoms. much more bent down- 

 wards than that of adelpJia Thoms. ; in this respect the latter is very 

 similar to that oi xantJiopyga Gestro , etc. ; but after a careful examina- 

 tion we can reduce them all to the four types I have figured. The 

 shape of the mesosternal process may be somewhat variable, the 

 shapes of the pygidia and forcipes are very sharply separated , and 

 I cannot find a single intermediate form between them. 



I have nothing to add to the genus Thaumastopeus (fig. 1,1a, 

 \h, Ic), this being already well limited. 



The genus IscJiiopsopka (fig. 2, la, 25, 2c) must become so- 

 mewhat more extensive and receive also L. ceramensis , camhodiensis. 

 I prepared the forceps of ceramensis and found it not different from 

 other Ischiopsopha' s ; the weak side of Mr. Gestro's genus is that 

 he has taken the stridulating-organs as a principal character , whilst 

 they are of secondary value only ; the true principal characteristics 

 are the visible scutellum , the straight mesosternal process and the 

 shape of the pygidium. — Regarding the abnormal convex L. ano- 

 mala Mohn. , placed among the Ischiopsopha' s by Mr. Gestro, and 



