76 



rt'|>lialollu)rax ; Ihc llagclliini consists of fioin seven to twelve, partly pinnate hairs, 

 which are placed in a longitudinal row; lamina exterior is always absent, serrula 

 interior has never any basal plate-shaped portion and serrula exterior has the third 

 distal part free at least. The galea, which is always wanting, is represented by a 

 rounded eminence. The labrum has a long posterior projection I', inst. in Obishim 

 miiscorum Leach., in which species the maxillae have short broad laminae, and in 

 which the median lyriforni organ of the ventral surface of the maxillae is rather 

 poorly developed (cf. p. 27). The coxae are always placed on a lower level than 

 the maxillae. The legs especially those of the first pair are long and slender; their 

 tibial femoral pari is always short and fairly similar to a real tibia; the trochantin 

 of the fourth pair of legs is as a rule^almost half as long as the whole femur and 

 separated from it by an almost perpendicular strictum. The tarsi, even those of 

 the fourth pair of legs, are always longer, sometimes much longer than the tibiae, 

 and their second joint is always the longer. The tarsi seem as a rule to bear a 

 lateral terminal hair of a peculiar shape; Blothriis spelaeus Sch. has a long, slender 

 pinnate hair (31. tab. I, fig. 2f), and so have Ohisiiim muscorum Leach, as well as 

 Ronciis (tlpinus L. K. (cf. p. 45). The members of this subfamily are well distinguished 

 from those of the Pseudobisiinae Hans., which like Ideoroncus laminatus n. sp. stand 

 on the border-land of the Hemictenodactijli, in several respects; but only a few 

 characters prove constant, if we compare an Obisiiii with a species like Ideobisium 

 crassinmtmm Balz., namely those found in the galea, in the tactile hairs of the 

 liand and perhaps in the structure of the labrum and lyriforni organs of the 

 maxillae. And even from these two main characters exceptions are found, if Banks' 

 observation is right, that the male of Ideoroncus obscunis Bks. has no galea (50. 

 p. 11), and if the hand of Ideobloihrus similis Balz, in reality does not bear any 

 tactile hairs, as set forth by Balzan (12. pi. 12, lig. 32). 



II. Synopsis of genera. 



1) No eyes Blothriis Sch. 



1) Eyes 



2. Two eyes Ronciis L. K. 



Four eyes Obisiuin 111. 



9 



Ohisivm 111. 

 1798. Illiger. Verzeichnis der Käfer Preussens. 

 Ccplialothorax provided with four eyes. 



The three following species have been described as belonging to this genus, 

 but as the descriptions are very imperfect and as they seem rather singular in 

 several respects, their systematic ])osition ought to be regarded as very doubtful; 

 they will probably be very difficult, if not impossible to identify. 



