332 ADDENDA 



distributed throughout the country. It is probably identical with the 

 0. cribellnm of Stephens, 



O. rufibarbis, Fab. (Syst. El. i., 201, ICS (?). Dej. (Sp. iv., 218, 

 24). This is the largest form of the group, the length varying from 

 8 to 10 mm. The thorax is always longer than it is in brevicollis, and 

 the punctuation is greater ; the hind angles are rectangular and well 

 marked, and there is no trace of a basal margin. The sedeagus is 

 plainly larger than in brevicollis, and is more contorted, with a 

 considerably broader apical margin. 



The species is not common, and does not vary much either in colour 

 or punctuation. Even in immature examples the head and thorax 

 are not brightly rufescent. I took a good series with Dr. Sharp at 

 Swaffham Prior, in Cambridgeshire, on the Devil's Dyke in 1892, and it 

 occurs at Oxford, Chatham, Mickleham, etc. 



O. cordatus, Dufts. (Faun. Aust. II., 100). This species has the 

 thorax much rounded at the sides in front and much nariowed behind, 

 the sides there becoming parallel for a short distance, so that the angles 

 ai'e quite rectangular. There is a fine but distinct raised margin along 

 the base. The species is easy to distinguish, except that it is occasionally 

 confused with 0. riqncola. The latter, however, has not got the sides 

 behind truly parallel, and the base is not margined. The ajdeagus, too, 

 is very diflerent, being very like that of 0. rnfiharbis, but considerably 

 shorter. This is always a scarce insect as British : most of our 

 examples are from Deal, but it has been taken by Mr. Champion at 

 Mickleham and Croydon. My note on the species (Brit. Col., i., 45) 

 must be cancelled in the face of Dr. Sharp's remarks (I.e., p. 185). 



O. rupicola, Sturm. (Deutsch. Ins., iv., 105). This, Dr. Sharp 

 says, is one of the easiest of the species to recognise on account of the 

 comparatively elongate and flat form and the shining elytra with 

 unusually coarse punctuation ; this sculpture, however, is rather denser 

 and finer in the female than it is in the male. The thorax is ample, 

 but a good deal narrowed behind, and that in a somewhat variable 

 manner, as the sides are sometimes only very slightly, sometimes 

 distinctly, sinuate posteriorly. When the sides are most sinuate the 

 hind angles approach nearly to being rectangular, but they are always 

 slightly obtuse, and there is no basal margin. The colour varies, the 

 head and thorax being sometimes rather bright red, but they are 

 seldom as dark as the elytra. The size runs from C>^ to 9^ mm. The 

 fedeagus is remarkable on account of the broad strongly margined 

 apical portion. The species is apparently widely distributed, and some- 

 times occurs in numbers in the South of England. It cannot, however, 

 be called common. 



O. rupicoloides. Sharp (Ent. Mo. Mag. xlviii. (2 Ser. xxiii. 1912, 

 208). Dr. Sharp says that he believes that this insect is largely responsible 

 for the confusion as to our forms, as he has found it mixed in collections 

 with several of the other species. It is allied to 0. rupicola through 

 the sedeagus, but may always be distinguished by its shorter form, and 



