ARCANA NATURiE. 127 



zona and New Mexico, and is figured by me in Smithsonian contributions, XI, in a memoir on tlie 

 Goleoptera of Kansas and New Mexico. 



I formerly included in this genus Meloe cancellatus, Br. and Er., and C. vittatus, Lee. [Proc. Acad., 

 VI, 330), which diflPer by the elytra being much shorter than the abdomen and diverging, though not 

 imbricate as in 3Moe. The ungues are armed with a tootii as in Cysteodemus. I now, however, fully 

 agrée with the opinion ofLacordaire [GeM. Col., V, 660), that they should form a new genus, for 

 which I propose the name Megetra. 



MALLODON, Serv. 



17. M. sERRULATus, pcco-nigeT nitidus, capite antice parchis, pone oculos densiuspunctato, genis sub- 

 acutis; thorace transverso, lateribus scabro et inœquali, disco subtilius parce punctato, antrorsum sub- 

 angustato, lateribus rectis sermlatis, versus angulos posticos paulo reflexis; elytris disperse subtilius 

 punctatis. — Long. 70 mill. — Tab. XIII, fig. 5. 



Leconte, Proceedings ofthe Academy of Natural Sciences of Philadelphia, VII, 82. Texas. This spe- 

 cies resembles M. cilipes, Hald. (Prionus cilipes, Sayj, but the sides ofthe thorax are less serrate and 

 less reflexed ; the dise is less convex ; the mandibles are similar to those of that species, not elongated, 

 but thick and emarginate at the apex. 



STENASPIS, Dup. 



18. S. SPLENDENS, lugra, tîiorace latitudine breviore, suUnœquali, irregulariter modice punctato, 

 plagis lœvibus relictis, postice magis constricto tuberculo laterali obtuso ; elytris viridi-œneis nitidis, 

 rugis profundis parcis intricatis^ interstitiis elevatis convexis parce punctulatis ; femoribus lœte auran- 

 tiacisbasi apiceque nigris antennis nigris, extrorsum rufescentibus. — Long. 35 mill. — Tab. XII, fig. 9. 



Leconte, Proceedings ofthe Academy of Natural Sciences of Philadelphia, VI, 441^ Texas. Resembles 

 in color and form S. verticalis, i)up., but the thorax is entirely black, and the posterior constriction 

 is much deeper; the very deep confluent rugosities of the elytra at first sight distinguish it. 



19. S. solitaria, Lee. (Cerambyx solitarius, Say) varies in having the head, thorax and anterior 

 part of the elytra reddish brown ; it dififers from both species above mentioned by the latéral tubercle 

 of the thorax being more acute and the anterior tubercle more prominent^ as well as by its black 

 color. 



ARHOPALUS, Serv. (eraend., Lec.j. 



20. A. EURYSTEïHus, fcrruglneus, subtus dense pallide sulphureo-pubescens, thorace fusco, dense sul- 

 phureo-pubescente, transverso, ad basin declivi, lateribus rotundatis ante basin angulatis ; elytris fuscis 

 piceo-pubescentibus, fascia lata dentata ad quadrantem, linea angulata ad médium, fascia lata pone 

 médium et linea angulata pallide sulphureis ornatis, ad apicem singulatim longe acuminatis ; pedibus 

 late distantibus, prosterno postice subproducto, late subtruncato. — Long. 20 mill. — Tab. XIII, fig. 9. 



Leconte, Proceedings of the Academy of Natural Sciences of Philadelphia, 1858, p. 82. Arizona. 

 The latéral angle ofthe thorax is sometimes distinct, sometimes indistinct, never acutely prominent as 

 in A. erijthropus. This species belongs to a group in which the anterior feet are widely sépara ted, the 

 prosternum broadly and slightiy produced posteriorly, and the mesosternum snddenly declivous in 

 front, thus exhibiting a tendency to Megaderus, which with the Trachyderides should immediately 

 foUow this group in a natural arrangement. 



