SILPHID^. 



93 



C. hrunneum, but has the thorax moi^e strongly punctured and more 

 shining ; the club of the antennfe is broader and ferruginous ; in 

 C. brunneiim it is generally infuscate. 



I am indebted for these remarks to Dr. Joy, who has been more 

 successful than any other entomologist in capturing and observing the 

 habits of this rare and obscure genus ; his observations on the assembling 

 of two or three species, without any apparent reason, on a small and 

 very limited spot, are particularly interesting (Ent. Mo. Mag. xlvi. 

 (2 Ser. xxi.) 1910, 25). 



C. calcaratum, Er., was deleted in Beare and Donisthorpe's 

 British catalogue, but has recently been reinstated by Joy, who, 

 in a paper entitled " Further Notes on the Genus Colon " (Ent. Mo. 

 Mag. xlvi. (2 Ser. xxi.) 1910, p. 267), while reintroducing this species, 

 deletes C. onicrops, Ozwal, and C. jmncticolle, Kraatz ; the former, 

 however, he has since again added to our list, and it is probable that 

 the latter may have to be replaced. The following corrected table, 

 based on the characters common to both sexes, has been kindly sent to 

 me by him ; the greater part of it has already been published (Ent. 

 Mo. Mag., I.e. p. 268). 



I. Tarsi linear {Colon, i. sp.) : 



i. 8th joint of antennfe not, or scarcely, 



narrower than 9th ; thorax as broad as 



elytra, and about as strongly punctured ; 



form long oval. ..... 



ii. 8th joint of antennae distinctly narrower 



than 9th ; thorax broader than elytra, 



and more strongly punctured ; foi'm 



shorter oval ...... 



II. Tarsi dilated, more strongly in male 

 {Mylcechus, Latreille). 



border of elytra 

 distinctly visible 



0. viENNENSE, Rerbst. 



C. SERRiPES, Sahib. 



i. Form much broader ; 



near base broad and 



from above 

 ii. Form longer, oval ; border of elyti-a 



much narrower, and not or scarcely 



visible from above^ 



1. 8th joint of antennje distinctly narrower 

 than 9th ; thorax about as long as 

 broad, deeply and closely punctui-ed, 

 more strongly so than elytra 



2. 8th joint of antennae as broad as, or 

 scarcely narrower than 9th ; thorax 

 distinctly tranverse : 



A. Thorax more strongly punctured than 

 elytra. 

 a. Last joint of club of antennae scarcely 

 narrower than the penultimate ; 



C. LATUM, Kraatz. 



C. AXGULARE, Er. 



