Crotch.] 82 (Feb. 7, 



LaTRIDIID.E, 



Anterior coxae conical, prominent separate, cavities closed. 

 Ventral segments 5, free, sub-equal. 

 Tarsi 3-jointed, simple, tibiae without spurs. 



Allied apparently to Silphidm by the anterior coxa? ; separable from its 

 allies by the 3-jointed tarsi. 



DERODOXTlDvE. 



Anterior coxaa conical, prominent, sub-transverse, contiguous, cavities 

 closed. 



Posterior coxae transverse, dilated internally, protecting the thigh. 



Ventral segments 5, free, equal. 



Tarsi 5-jointed, 4th is somewhat smaller. 



Eyes finely granulated. 



Separated by Leconte from Latridiida? with obvious propriety. I have 

 provisionally placed the anomalous genus Pcltastica in this family, it 

 agrees in all essential characters, and it differs only in facies. The 

 Europe in genus Phlceophilus belongs here also, but has the coxal cavities 

 .open. 



Derjiestid.e. 



.Anterior coxae conical, prominent, cavities open. 



Posterior coxae transverse, dilated internally to protect the thighs. 



Ventral segments 5, free, equal. 



Tarsi 5-jointed, tibiae with spurs. 



Front usually with an ocellus. 



Tliis family (excluding Trizagus) is very homogeneous ; the prominent 

 eoxre and free ventral segments show that it must come near SilfMda : 

 the majority of genera are at once known by the frontal ocellus. 



EXDOMTCHID.E. 



Anterior eoxae globose, or conical, sometimes contiguous, more or less 

 prominent, eavities open. 



Ventral segments 5, first very long. 



Tarsi 4-jointed, 2d emarginate, 3d hidden. 



Differs from MycetopMgidie by the bilobed tarsi and the long 1st ven- 

 tral segment. Gerstaecker and Thomson rightly include Mycetoma in this 

 family, though the tarsi simulate closely those of Mycetophagidce ; the 

 contiguous sub-eonieal coxae show that its place is at this end of the 



series. 



Trifhyllih.e. 



Anterior coxae oval, prominent, cavities open. 



Ventral segments 5, equal. 



Tarsi 4-jointed {% 3, 4, 4 s ), filiform. 



Eyes coarsely granulated. 



Leconte has included Diphyllus, which I have removed to a separate 

 family. Thomson adds T-etratoma, in which I think he is very possibly 

 rbdit ; certainly I do not see that genus belongs to the Heteromerous 



