26' Mr. H. Scott on CoYy\o\)]ndx from the 



inter se from tl)ose o£ Moronilhii. Nevertlieless, Leconte and 

 Horn .and Matthews regarded Gloeosoma (like MoroniUus) as 

 a synonym of hhypohius ; but Ganglbauer (/. c.) was iiot 

 convinced, and Casey (1900, p. 65) wrote that Qioeosoma is 

 altogether distinct from Hhypohius. I have examinc^d the 

 type of G. velox under the higliest power appHcable to a 

 carded specimen, and found that the antenna; a|)peared almost 

 certainly 10-jointed_; but being still not satisfied, I mounted in 

 balsam the antenna o£ one of the North-African specimens, 

 which seem absolutely identical with the type. This antenna 

 (fig. 39) is 10-jointed, having between the second and the 

 next large joint one small joint less than in Rhi/pobius, and, 

 as stated by WoUastoii, the form and proportions of the joints 

 differ fiom those of lihypoljlus. The three joints (5, 6, 7) 

 preceding the three club-joints are all much longer in propor- 

 tion than the corresponding three (6, 7, 8) in Rliypohiuft, and 

 the large middle oiie of the tiiree especially is of a different 

 shape. 



If the number of antennal joints be used as the criterion 

 for separating the genera, the matter may be summarized 

 thus :— 



Bhyjiobius [■= MoroniUus) , antennae 11-jointed. 



Gheosoma, anteruias 10-jointed. 



Secondary Scti'ual Characters. — I do not know of any 

 reference to these in lihypobiiis. But the material before me 

 includes three specimens of a species, apparently new, two of 

 which have a marked impression on the nietasternum, while 

 in the third this is quite absent. In comparing certain other 

 species with mine, it was seen that some examples have 

 impressions on the nietasternum and sometimes on the first 

 abdominal segment as well. Having before me two speci- 

 mens of 7?/?_?/^>6Z'iMs r vfi.co His (J) nvi\\) J one of which has the 

 sternum impressed while the other has not, I dissected these 

 and found that the insect with impressed sternum is J, while 

 the otlier is ? . I therefore infer that the ventral impressions 

 are a c? character, though further study is needed to prove 

 whether they are present in all or only in some species. 

 Those in which they have so far been observed are : — 



(i.) R. riijicollis (Duval), ^^ : a lather faint and narrow 

 longitudinal impression on the posterior | of the metasternum, 

 and a long narrow impression down ihe middle of the first 

 abdominal segment. 



(ii.) 21. brevicornis, Matth., J : a deep and rather broader 

 longitudinal impression on the nietasternum; on the first 

 abdominal segment a very broad and deep impression, 

 extending the wdiole length of the s< gment and nearly the 



