COLYDIIDAE. 12*) 



These genera belong to the Atlantie region. BlachlofcK Pascoe 

 iis said by Reitter to be the same as the previously described 

 genus Erotylathris Molsch. 



Tribe VII.— CERYLOXINI. 



Small, oblong or oval, flattened insects, having all the coxae 

 widely separated, the first ventral segment elongated, and the last, 

 joint of the palpi small and acicular, the penultimate thick; lobes 

 of the maxilla3 long and slender. 



.Anterioi- coxal cavities closed beliind. Antenna 10-jointed. cliili solid. 



Cerylon 

 Anterior coxal cavities open. Antennae 11-jointed, elnb '2-jiiintid. 



Philothermus. 



Sub-Family II.— MURMIDIIN.E. 



This sub-family contains two genera, each represented by one 

 species. Tlie head is more or less retractile, protected by a well- 

 marked prosternal lobe in Murmidius, or a shoi't one in Mycho- 

 cerns. The antennas are frontal, 10-jointed, terminated by a solid 

 club, apparently of two joints, received in a cavity in the anterior 

 angle of the thorax. The anterior coxte are inclosed behind by 

 the mcsosternum. The posterior coxa? are small. The legs are 

 retractile, and received in excavations at the sides of the respec- 

 tive segments, the cavities for the posterior legs are in part in 

 the abdomen. 



Diverse opinions have been expressed regarding the position 

 of these genera, and they have been placed in Colydiidse and 

 Ilisteridte, and have been made a separate family by DuVal. 

 They seem better placed here as a sub-family, at least for the 

 present. 



The genera are as follows : — 



Antennal cavity visible from above; prosternal lobe well iiKukcd, con- 

 cealing the parts of the month beneath ; metasternal side pieces con- 

 cealed by the epipleurse. Murmidins. 



Antennal cavity opening in front, not visible from abov(! ; prosternal lobe 

 truncate: metasternal side pieces with the sutures very (>vident. 



Mychocerus. 



Murmidius ovalis has been widely diffused by commerce. 

 Mychocerus depressus occurs in the Southern States. 

 9 



