1852.] 93 
is strongly margined both on the sides and apex. The elytra are strongly but 
not densely punctured ; the inner of the two spots is near the scutellum, the outer 
one behind the humerus. The posterior band is oblique and sinuous. 
3. N. cavicornis, minus elongatus, fusco-testaceus, thorace rotundato, 
transverso, cornu elongato, apice concavo, crista subito valde elevata, elytris 
punctatis, macula scutellari,. lineolis anticis, fasciaque postica nigro-fuscis. 
Long. +11. 
Lec. An. Lye. 5, 152. . 
San Francisco, California: male with the apex of the elytra acute, obliquely 
truncate on the outer side. The thorax is one-half wider than long, the horn 
broad not serrate, strongly excavated at tip, crest broad, high, margined on the 
sides and apex, which is rounded. Elytra distinctly, not densely punctured. 
4. N.serratus, elongatus, testaceus, thorace globoso, cornu antice con- 
cavo, serrato, crista snbito valde elevata. elytris subtilius punctatis, macula scu- 
tellari, lineolis anticis, fasciaque lata postica infuscatis. Long. +17. 
Monocerus serratus Lec. Journ. Ac. Nat. Sc. New Ser. 1, 90. 
Near the Rocky Mountains. One male specimen has the elytra immaculate, 
with the apex slightly truncate. The horn is broader than usual, strongly serrate, 
concave at the apex; the crest is high and rises very suddenly, is strongly mar- 
gined, but scarcely rounded at the apex. The elytra are more finely punctured 
than in the preceding species. 
5. N. monodon, elongatus, testaceus, thorace globoso, subtransverso, 
cornu antice concavo, serrato, crista sensim modice elevata, elytris minus subti- 
liter punctatis, macula scutellari fasciaque postica nigris. Long. -12. 
Ferté Anthic. 37. 
Anthicus monodon Fabr. Syst. El. 1, 259: Say, Am. Ent. 1, pl. 10. 
Monocerus monodon var. a. Lec. Journ. Ac. Nat. Sc. New Ser. 1, 90. 
Massachusetts, Pennsylvania, Georgia, Missouri Territory and California. The 
horn is serrate, broad and concave at the apex; the crest is moderately broad, 
rises gradually and is margined on the sides and tip, which is somewhat acute. 
The elytra are strongly punctured, though less so than in N. anchora; the scu- 
tellar spot is sometimes wanting. 
6. N. apicalis, elongatus, testaceus, thorace globoso, cornu antice con- 
cavo, lateribus serrato, crista subito valde elevata, elytris densius punctatis, 
macula scutellari, fascia postica, apiceque nigris. Long. -15. 
Monocerus monodon Lec. Journ. Ac. New Ser. 1. 90. 
Detroit, Michigan. Easily distinguished from the preceding by the form of 
the horn. The thorax is not at all transverse; the horn is broad, concave at the 
apex, serrate on the sides; the crest rises very suddenly, and is margined at the 
sides and apex, which is rounded. ‘The elytra are tolerably densely punctured. 
7. N.marginatus, valde elongatus, testaceus, thorace subgloboso, cornu 
vix serrato, crista subito valde elevato, elytris subtiliter punctulatis, gutta sub- 
scutellari, linea submarginali, fascia tenui postica, apiceque nigris. Long. -16. 
Detroit. _ Easily distinguished by its much narrower form. The thorax is 
less narrowed behind than usual, and not at all transverse; the horn is margined 
and scarcely serrate; the crest rises suddenly and is margined at the sides and 
apex, which is rounded. ‘The black marks of the elytra are very narrow; the 
fascia is angulated at the suture, and does not reach the margin; the submar- 
ginal line extends from below the humerus to the apex. 
8. N. subtilis, valde elongatus, fusco-testaceus, thorace globoso, subtrans- 
verso, cornu serrato, crista subito valde elevata, elytris subtilissime punctulatis, 
macula scutellari, fascia ad medium apiceque nigris, margine infuscato. 
Long. +13. 
Missouri Territory, one specimen. Differs from all the preceding species by 
the fascia being at the middle of the elytra. The thorax is slightly transverse ; 
the horn is concave at the apex, subserrate; the crest rises abruptly and is 
strongly margined and somewhat rounded at the apex. 
