CUPESIDAE. 229 



Lec. does not diflfer essentially from Psoa, and another instance 

 is thus presented of the analogy of the fauna of the western side 

 of our own continent with that of Europe. 



* 



Sub-Family IV.— LYCTIN^. 



The head is prominent, somewhat narrowed behind the eyes, 

 not covered by the prothora.x, wliicb is trapezoidal in form, and 

 has a fine lateral margin. The antennae are 11 -jointed, and the 

 club is rounded, and consists of but two joints; the epistoma is 

 separated from the front by an indistinct suture. The anterior 

 coxas are entirely inclosed and separated by the prost.ernum ; 

 the nn'ddle ones are also moderately separated, and the hind coxre 

 are widely distant; the first ventral segment is much longer than 

 the others. 



Our genera are two, both containing species of small size: — 



Anterior til)i?e witli tlie outer apical angle prolonged. Lycttis. 



Anterior tibiae with the outer apical angle not prolonged. Trogoxylon. 



The type of Trogoxylon is X;/lotfugus ]>a7-allelipipedu6 Mels., 

 from the Middle States. 



Lyctus is attached by Lacordaire to the Cioida?, but he admits 

 the difficulty of placing it properly in any family; from the 

 5-jointed tarsi, with the first joint very short, and the distinct 

 terminal spur of the anterior tibia?, it and Endecatomus seem 

 more naturally placed in the present than in the Cioida:-. 



Lacordaire states that the anterior and middle coxa3 are con- 

 tiguous in Lyctus; they are not so in any of our species, and 

 although nearly in contact in L. i<iriuius, they are widely separate 

 in L. planicollis. 



Fam. XLVIII.— CUPESIDAE. 



Mentum small, transverse, corneous; ligulu small bilobcd; 

 palpi 3-joiated. 



Maxillie uncovered at the base, but concealed in the 

 deep buccal cavity, with two lobes, the outer one corneous, 

 hooked; palpi 4-jointed, short. 



Antennas inserted upon the front, ap{)roximate, rigiJ, lili- 

 form, moderately elongated, 11- jointed. 



Head porrected, tuberculate, suddenly constricted behind; 



