The North American Species 

 of Coelambus 



By H. C. FALL 



The members of the genus Coelambus possess a facies which makes 

 them tolerably easy of recognition at sight ; they^ may however be 

 distinguished at once and with certainty from allied genera by the 

 raised line obliquely crossing the epipleurae at base. Our species are 

 fairly numerous, the number known to me at present being nearly twice 

 that indicated in the Henshaw List, all of which except the infusccv- 

 tus of Sharp, are represented in the material studied. C. princeps, 

 recently described from Florida by Blatchley is not a Coelambus, but 

 belongs in all essentials to Pachydrus, a genus represented by a small 

 number of species in the Antilles and Tropical America. Through the 

 kindness of its author I have been permitted to examine the type, 

 which seems to me distinct from any of the species given in Sharp's 

 Monograph. 



In the table of species which follows, some emphasis has been placed 

 on the degree of dilatation of the male tarsi. Since in several species 

 the tarsi of the male are very little wider than in the female, or 

 even narrower than in females of other species, it is necessary to have a 

 sure means of recognizing the males. In the greater number of species 

 the thickening of the anterior claw of the front tarsus of the male, 

 though sometimes feeble, is sufficient at once to reveal the sex, but 

 when this character fails it will be useful to remember that in the male 

 the basal two joints of the front and middle tarsi are (one or both) 

 perceptibly wider than the third, while in the female the first three 

 joints are of equal width. 



Unless otherwise stated, the types of all new species are in the writer's 

 collection. 



Wherever the order of species differs in the text from that in the 

 table, the former should be followed in cataloguing or in a cabinet 

 arrangement. 



1. Front margined (except farctus), body broadly ovate and very con- 

 vex beneath (except intermedium), color beneath entirely rufous 



or rufotestaceous 2 



Front not margined (except masculinus and fastidiosus) , form less 

 broad and less convex, body beneath black (except laccophilinus and 

 sylvanus, size generally larger 3 



1 



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