NORTH AMERICAN COLEOPTERA. 183 



Sub-genus Collapteryx. 



The vestiture of the tarsi is variable, and affords the means of dividing 

 the species into smaller groups. No other characters than those given 

 above vrill apply to all the species. 



The name here used has been proposed by Newman (Ent. Mag. v, p. 

 397 ) for a Mexican species, and should it be considered advisable to 

 divide Monilema into two genera this name should be revived, the divi- 

 sion Omoscylon proposed by Mr. James Thomson being founded on 

 evanescent characters. 



From the varying tarsal and other structures the species may be sepa- 

 rated in the following manner : 



Scape of antennae and legs smooth 2. 



Three basal joints of antennpe and legs coarsely punctui'ed 7. 



2. — First joint of hind tarsus without any spongy pubescence beneath 3. 



First joint of hind tarsus spongy pubescent over almost the entire surface.. ..8. 

 3. — Second joint of hind tarsus with a small spongy pubescent space each side. .4. 



Second joint of hind tarsus without trace of spongy pubescence 6. 



4. — Thoracic spines long and acute, directed strongly upward and backward. 



Elytra with slightly depressed disc, the sides abruptly declivous, obtusely 

 margined near the humeri. Thorax with very few punctures. 



gigas Lee. 



Thoracic spines small or tuberculiform, sometimes barely perceptible 5. 



6. — Thorax with numerous coarse and fine punctures intermixed over the entire 

 surface, the coarser punctures more numerous near the base and apex. 



seiiiipiinelatum Lee. 

 Thorax almost entirely smooth, a few punctures, at most, along the base and 

 apex. 

 Elytra with extremely few punctures, these placed at the middle of the side 



and under the humeri laeTij^atuin Bid. 



Elytra with numerous coarse punctures extending two-thirds to apex, the 



deflexed portion punctured nearly to the apex armatuiu Lee. 



6. —Anterior tarsi with the first three joints spongy pubescent beneath. Thorax 



coarsely punctured with a feeble lateral tubercle obtusiim Lee. 



Anterior tarsi with the third joint bearing a small spongy pubescent space 

 each side. 

 Thorax punctured at apex and base, the lateral spine small but acute. 



spoliatuni n. sp. 

 Tarsi with scarcely a trace of spongy pubescence on any of the joints. Tho- 

 rax coarsely punctured, the lateral spine moderately long and acute. 



forte Lee. 

 7. — Thorax sparsely punctured, without trace of lateral tubercle, elytra coarsely 

 punctured. Hind tarsi with a small spongy pubescent spot at the apex 

 of the first joint, the second and third joints entirely spongy pubescent. 



subrngosum Bid. 



