APPENDIX. 461 



obliquely backward and joining the suture between the metasternuru and 

 its episternum ; it is possible that this may prove a good character with 

 regard to some of our species. The males are, as Dr. Horn observes, in 

 most cases easy to distinguish from the females ; the head is larger and 

 more prominent, the mandibles more slender and projecting, the labrum 

 longer, and the clypeus retuse to a varying degree ; the thorax is at least 

 as broad as the elytra, sometimes slightly broader, and not gradually 

 narrowed to the front as in the female ; at the same time it must be 

 remembered that it is easy to regard the male as a separate species, an 

 error which can only be avoided by capturing the species in the burrows, 

 two, a male and a female, usually occupying one burrow. 



The British species have usually been considered to be eight in 

 number ; of these H. fossor, Kies. (redus, Wat.) and H, arenarius, 

 Kies., have been regarded as doubtful, and the generally recognized 

 species, six in number, are H.femoralis, Kies., H. oibsoletus, Curt., H. 

 marginatus, F., H. l<.n*iyatus, Panz., H. fttsculus, Kies., and H. sericans, 

 Panz. ; as far as I have been able to make out H. rectus, "Wat., is an 

 intermediate variety or species between H, salinus and If. fossor ; 

 H. arenarius must be regarded as a very doubtful species ; U.fenioralls 

 and H. flexuosus, which have usually been regarded as synonymous, 

 must now be considered as distinct; a new species, H, pulchdlus, Kies., 

 must be added doubtfully before H. fuscvltts, and for //. sericans a 

 newly described species, H. britanniciis, Kuw., must be substituted ; 

 apparently we do not possess the true H. scri'.-ans, but the specimens 

 which have been named for me by Herr Kuwert as H. britanniciis 

 appear to differ considerably, and I was at first inclined to think that 

 part of them should be referred to an allied species, if not to H. sericans, 

 which may perhaps be found in our collections. The following then 

 may be regarded as a provisional list of our species, as far as is at 

 piesent known; they are given in the order in which they come in 

 Herr Kuwert's monograph : 



Sub-gen. Heterocerits, i. sp. 



flexuosus, Steph. (femoralis, Kies., j*m). 



salinus, Kies., var. ractus, Wat. 



(arenarius, Kies. ? ?) 



femoralis, Kies. 



Sub-gen. Tcenhetoceruf, Kuwert. 



marginatns, F. 



(sericans. Kies. ? ?) ) T ... . T\ r> 



i ., .' v s.g. Littorimuf, Des Gozis. 



bntanmcus, Kuw.) 



obsoletus, Curt. 



pulchellus, Kies. 1 



fusculus, Kies. 



li.fiyatus, Panz. 



//. jJtxuosus, Steph., and H. jemorali^, K., arc considered synony- 

 mous in our catalogues ; the latter insect is, however, smaller with the 

 elytra rather shorter and the hinder indented cross markings situated a 



