528 COLEOPTERA OF NORTH AMERICA. 



Eurymydcr fasoiatua extends from New York to Yancouver 

 Island: the other species are found in the Atlantic region. 



Groiii) III. — Hormisci. 



The genera upon wliieh this group is founded seem sufficiently 

 distinct from the other Corrhecerides of Lacordaire to be sepa- 

 rated from thera. It has the following characters: — 



Beak not dilated at the sides over the antennal cavities. Eyes 

 eniarginate, not finely granulated. Prothoracic ridge antebasal, 

 curved, or ol)tusely angulate backwards at the middle, flexed 

 ol)liquely forward at the sides. Tarsi with the first joint long; 

 second triangular, scarcely emarginate ; third bilobed, not nar- 

 rower, but shorter than the second; claws acutely toothed at the 

 middle. Mentum transverse, less deeply emarginate than usual, 

 with the emargination nearly filled by the broad basal piece of 

 the ligula ; transverse suture between the gula and mentum dis- 

 tinct. 



Antennal club S-jointed. 2. 



Antennal club solid, sensitive only at tip. Hormiscus, 



2. Eyes feebly emarginate ; claws indistinctly toothed. Toxotropis. 



Eyes strongly emarginate ; claws cleft almost to the base. Gonops. 



Gonops is Californian, the other two genera are found in the 

 Atlantic region. 



Tribe II.— BASITROPINI. 



The only characters of a general kind which can be given to 

 distinguish this from the other tribes are that the antenusB are 

 inserted under the sides of the beak, and that the prothoracic 

 ridge is quite basal, causing tlie surface behind it to become 

 l)erpendicular ; it consequently attains the hind angles, and is 

 there flexed forwards, not obliquely and at an obtuse angle, but 

 rectangularly. Asa farther consequence of this arrangement the 

 l)asal margin of the -elytra is acute. 



Our species represent but three groups: — 



Jieak with parallel or nearl}' parallel side.s. 2. 



Hoak narrow in front, trapezoidal. Braciiytarsi. 



2. Tarsi with third joint wider, deeply bilobed, visible from above. 



A.NTHRIBI. 



Tarsi with the thinl joint bilobed, not visible from above. Cratopares. 



