NORTH AMERICAN COLEOPTERA. 309 



But one genus constitutes this group, having characters sufficiently 

 obvious to make it easily recognized without discussion. On one 

 point sufficient stress does not seem to be laid, and that is in refer- 

 ence to the insertion of the antennse. Chapuis has indicated one 

 group in which the insertion of the antennae against the inner border 

 of the eyes is made the important character. Here a similar char- 

 acter has been passed over in silence. The antennse of Psylliodes 

 are inserted as close to the eye as is possible without causing an 

 em argi nation. 



The fauna of Europe is more than ten times richer in species than 

 our own, the disparity being greater than in either Chtetocnema or 

 Longi tarsus. 



PSYI^IilODES Latr. 



Head oval, deeply inserted, the front inclined, or nearly vertical, 

 without carina, but forming a broad flat plate, tubercles not distinct, 

 usually with an arcuate impressed line, which marks the lower edge 

 of the tubercles (entirely absent in subln'.vis), clypeus truncate, lab- 

 rum moderately prominent, entire. Antennse 10-jointed, separated 

 at base, inserted at the inner border of the eye, filiform, slightly 

 thicker externally, first joint slender clavate, joints '2-3-4 nearly 

 equal, 5-9 gradually slightly shorter, tenth longer, acute at tip. 

 Maxillary palpi slender, second joint slender clavate, third obconical, 

 acute at tip. Thorax transverse, narrowed in front, base broadly 

 arcuate, with distinct marginal line, obliterated at middle. Elytra 

 oblong oval, usually widest slightly in front of middle. Prosternum 

 moderately separating the coxse and not depressed between them, 

 dilated at apex and with the epimera closing the cavities. Mesos- 

 ternum moderately long, slightly oblique Legs moderate in length, 

 ])osterior femora much thickened, deeply sulcate beneath for the 

 tibia3. Anterior and middle tibice slender, the outer edge rounded, 

 posterior tibise broader toward apex, the posterior edge sinuate near 

 apex and with a border of short cWne, the tip prolonged beyond the 

 insertion of the tarsi and terminated by a short spur (PI. VII, fig. 

 13). Posterior tarsi long and slender, the first joint moi-e than half 

 the length of the tibiae, the third joint narrowly bilobed, the fourth 

 slender and with moderately long simple claws. 



This genus is probably one of the most easily recognized of the 

 tribe by the structure of the antenna? and posterior tibire. The apex 

 of the posterior tibia is not simply prolonged beyond the insertion of 



